diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/.gitignore b/놀이터(예제 코드 작성)/solid-design-pattern-sample/.gitignore
new file mode 100644
index 0000000..c2065bc
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/.gitignore	
@@ -0,0 +1,37 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/README.md b/놀이터(예제 코드 작성)/solid-design-pattern-sample/README.md
new file mode 100644
index 0000000..00d7130
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/README.md	
@@ -0,0 +1,178 @@
+# SOLID & Design Pattern Sample
+
+## SOLID
+
+- SOLID 원칙들은 소프트웨어 작업에서 프로그래머가 소스 코드가 읽기 쉽고 확장하기 쉽게 될 때까지 소프트웨어 소스 코드를 리팩터링하여 코드 냄새를 제거하기 위해 적용할 수 있는 지침이다.
+- 각 항목별 before & after 를 비교하면서 어떤 차이가 있는지 생각해본다.
+- before & after 에 새로운, 또는 동일한 규칙(비즈니스 로직, 유효성 검사 등)을 적용해야 한다고 가정하고 변경을 시도해본다.
+
+### SRP(Single Responsibility Principle)
+
+- 단일 책임 원칙
+- 한 클래스는 하나의 책임만 가져야 한다. 즉, 한 클래스가 변경되는 이유는 한 가지여야 한다.
+
+#### 구현 요구사항
+
+- 예금주의 이름으로 계좌를 생성할 수 있다.
+- 계좌에 입금할 수 있다.
+- 계좌에서 출금할 수 있다.
+
+### OCP(Open/Closed Principle)
+
+- 개방-폐쇄 원칙
+- 소프트웨어 요소는 확장에는 열려 있으나 변경에는 닫혀 있어야 한다.
+
+#### 구현 요구사항
+
+- 최초의 결제방식은 현금, 카드 두 가지가 있다.
+- 쿠폰 결제방식을 추가한다고 가정한다.
+- 쿠폰으로 결제할 경우 잔고가 차감되지 않는다.
+
+### LSP(Liskov Substitution Principle)
+
+- 리스코프 치환 원칙
+- 프로그램의 객체는 프로그램의 정확성을 깨뜨리지 않으면서 하위 타입의 인스턴스로 바꿀 수 있어야 한다.
+
+#### 구현 요구사항
+
+- 좌표를 입력하면 해당 좌표로 이동수단의 위치가 변한다.
+
+### ISP(Interface Segregation Principle)
+
+- 인터페이스 분리 원칙
+- 특정 클라이언트를 위한 인터페이스 여러 개가 범용 인터페이스 하나보다 낫다.
+
+#### 구현 요구사항
+
+- 영화 상영관 좌석 현황을 조회할 수 있다.
+- 영화표 예매를 진행할 수 있다.
+
+### DIP(Dependency Inversion Principle)
+
+- 의존 역전 원칙
+- 프로그래머는 “추상화에 의존해야지, 구체화에 의존하면 안된다.” 의존성 주입은 이 원칙을 따르는 방법 중 하나다.
+
+#### 구현 요구사항
+
+- 저장소에서 파일 데이터를 불러올 수 있다.
+- 하나의 저장소만 사용하며 저장소의 타입은 언제든지 변경될 수 있다.
+- 각각의 저장소는 각자만의 파일 데이터 조회 요청 인터페이스를 제공한다.
+    - 아마존에서는 파일 이름을 요구한다.
+    - 구글에서는 파일 번호를 요구한다.
+
+## Design Pattern
+
+### 전략(Strategy) 패턴
+
+#### 구현 요구사항
+
+- 연령대별로 물건의 할인된 금액 계산기를 구현한다.
+    - 아이일 경우 할인율은 15%이다.
+    - 어른일 경우 할인율은 30%이다.
+
+### 템플릿 메서드(Template Method) 패턴
+
+#### 구현 요구사항
+
+- 스포츠 강사를 구현한다.
+    - 모든 강사는 강의가 시작할 때 스트레칭을 한다.
+    - 모든 강사는 강의가 끝날 때 인사한다.
+    - 수영 강사는 강의 중간에 수영 동작을 보여준다.
+    - 축구 강사는 강의 중간에 축구 동작을 보여준다.
+
+### 상태(State) 패턴
+
+#### 구현 요구사항
+
+- 상태별로 다르게 움직이는 게임 캐릭터를 구현한다.
+    - 기본적으로 게임 캐릭터는 정지상태이다.
+    - 정지 상태에서 버튼을 누르면 이동한다.
+    - 이동하는 상태에서 버튼을 누르면 점프한다.
+    - 점프하는 상태에서 버튼을 누르면 착지한 뒤 정지한다.
+    - 게임 캐릭터는 버튼을 누르면 동작하는 상태로 스스로의 상태를 변경한다.
+
+### 데코레이터(Decorator) 패턴
+
+#### 구현 요구사항
+
+- 용사는 검을 가진다.
+- 용사는 검을 바꿀 수 있다.
+- 검에는 속성이 부여될 수 있으며, 속성에 따라 공격이 변한다.
+- 용사가 공격하면 소지한 무기의 공격이 발동된다.
+
+### 프록시(Proxy) 패턴
+
+#### 구현 요구사항
+
+- 지갑의 주인은 지갑에 대해 입금 또는 출금을 진행할 수 있다.
+- 지갑의 동작은 입금 및 출금만 가능하도록 제한된다.
+- 지갑에 대해 입금 또는 출금이 이루어질 때 메시지를 출력한다.
+
+### 어댑터(Adapter) 패턴
+
+#### 구현 요구사항
+
+- 발전소는 정해진 요청 규격에 따라 전기를 생산한다.
+- 가정은 정해진 규격에 따라 전기를 얻는다.
+- 발전소와 가정에서 사용하는 전기는 각각 다르다.
+- 발전소에서 생산한 전기를 가정용으로 변환하는 계산식은 아래와 같다.
+    - 생산된 전류량 * (발전소 전압 / 가정용 전압)
+    - 발전소에서 생산한 전기의 전압은 11000V 이다.
+    - 가정에서 사용하는 전기의 전압은 220V 이다.
+
+### 옵저버(Observer) 패턴
+
+#### 구현 요구사항
+
+- 주문의 상태가 변경되면 배송팀과 운영팀에 알리고, 각각의 팀은 그에 따른 조치를 취한다.
+    - 배송팀은 배송을 시작한다.
+    - 운영팀은 고객에게 메시지를 전송한다.
+- 배송팀과 운영팀 외에 다른 팀에도 필요하다면 또 다른 팀에 메시지를 전송해야 할 수도 있다.
+
+### 미디에이터(Mediator) 패턴
+
+#### 구현 요구사항
+
+- 가전제품의 전원을 제어한다.
+- 가전제품의 전원은 하나만 켤 수 있고, 하나를 켜면 나머지는 모두 꺼진다.
+- 가전제품을 켤 경우, 해당 가전제품의 이름을 메시지로 전송한다.
+
+### 파사드(Facade) 패턴
+
+#### 구현 요구사항
+
+- 회원의 모든 정보를 조회한다.
+- 회원의 모든 정보에는 회원의 기본 정보와 친구들에 대한 정보가 있다.
+    - 회원의 기본 정보에는 이름, 나이가 있다.
+    - 회원의 친구 정보에는 친구의 이름, 나이가 있다.
+
+### 추상 팩토리(Abstract Factory) 패턴
+
+#### 구현 요구사항
+
+- 과일 이름을 입력하면 해당 과일 또는 과일주스를 만들어주는 마법이 있다.
+- 과일의 종류는 사과, 바나나, 오렌지로 총 세 가지다.
+- 과일주스의 종류도 마찬가지로 사과주스, 바나나주스, 오렌즈주스로 총 세 가지다.
+
+### 컴포지트(Composite) 패턴
+
+#### 구현 요구사항
+
+- 프랜차이즈 기업의 정산은 가맹점으로 가입된 모든 가게들의 정산을 포함한다.
+- 프랜차이즈 기업은 다른 프랜차이즈 기업을 포함할 수 있다.
+- 프랜차이즈 기업은 이름을 갖는다.
+- 프랜차이즈 가맹점은 이름을 갖는다.
+
+### 널 객체(Null Object) 패턴
+
+#### 구현 요구사항
+
+- 식당에서는 직원을 이름으로 관리하며 동명이인은 없다고 가정한다.
+- 이름으로 직원을 찾을 수 있고, 해당 직원에게 근무일자를 할당할 수 있다.
+- 직원은 근무일자를 고지 받으면 해당 날짜를 기억한다.
+
+## 참고자료
+
+- [SOLID (객체 지향 설계)](https://ko.wikipedia.org/wiki/SOLID_(%EA%B0%9D%EC%B2%B4_%EC%A7%80%ED%96%A5_%EC%84%A4%EA%B3%84)) 
+
+
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/build.gradle.kts b/놀이터(예제 코드 작성)/solid-design-pattern-sample/build.gradle.kts
new file mode 100644
index 0000000..b6813a1
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/build.gradle.kts	
@@ -0,0 +1,39 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+	id("org.springframework.boot") version "2.7.5"
+	id("io.spring.dependency-management") version "1.0.15.RELEASE"
+	kotlin("jvm") version "1.6.21"
+	kotlin("plugin.spring") version "1.6.21"
+	kotlin("plugin.jpa") version "1.6.21"
+}
+
+group = "com.banjjoknim"
+version = "0.0.1-SNAPSHOT"
+java.sourceCompatibility = JavaVersion.VERSION_11
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation("org.springframework.boot:spring-boot-starter-data-jpa")
+	implementation("org.springframework.boot:spring-boot-starter-validation")
+	implementation("org.springframework.boot:spring-boot-starter-web")
+	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
+	implementation("org.jetbrains.kotlin:kotlin-reflect")
+	implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+	runtimeOnly("com.h2database:h2")
+	testImplementation("org.springframework.boot:spring-boot-starter-test")
+}
+
+tasks.withType<KotlinCompile> {
+	kotlinOptions {
+		freeCompilerArgs = listOf("-Xjsr305=strict")
+		jvmTarget = "11"
+	}
+}
+
+tasks.withType<Test> {
+	useJUnitPlatform()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/gradle/wrapper/gradle-wrapper.jar b/놀이터(예제 코드 작성)/solid-design-pattern-sample/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..249e583
Binary files /dev/null and b/놀이터(예제 코드 작성)/solid-design-pattern-sample/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/gradle/wrapper/gradle-wrapper.properties b/놀이터(예제 코드 작성)/solid-design-pattern-sample/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..ae04661
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/gradle/wrapper/gradle-wrapper.properties	
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/gradlew b/놀이터(예제 코드 작성)/solid-design-pattern-sample/gradlew
new file mode 100755
index 0000000..a69d9cb
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/gradlew	
@@ -0,0 +1,240 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/gradlew.bat b/놀이터(예제 코드 작성)/solid-design-pattern-sample/gradlew.bat
new file mode 100644
index 0000000..f127cfd
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/gradlew.bat	
@@ -0,0 +1,91 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/settings.gradle.kts b/놀이터(예제 코드 작성)/solid-design-pattern-sample/settings.gradle.kts
new file mode 100644
index 0000000..80d1c28
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/settings.gradle.kts	
@@ -0,0 +1 @@
+rootProject.name = "solid-design-pattern-sample"
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/SolidDesignPatternSampleApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/SolidDesignPatternSampleApplication.kt
new file mode 100644
index 0000000..8b19534
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/SolidDesignPatternSampleApplication.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample
+
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.runApplication
+
+@SpringBootApplication
+class SolidDesignPatternSampleApplication
+
+fun main(args: Array<String>) {
+	runApplication<SolidDesignPatternSampleApplication>(*args)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/AppleMagic.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/AppleMagic.kt
new file mode 100644
index 0000000..4c9a14f
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/AppleMagic.kt	
@@ -0,0 +1,16 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.Apple
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.AppleJuice
+
+class AppleMagic : Magic {
+    override fun createFruit() {
+        val apple = Apple()
+        println("과일 [${apple.name}]를 만들었습니다!")
+    }
+
+    override fun createJuice() {
+        val appleJuice = AppleJuice()
+        println("과일주스 [${appleJuice.name}]을 만들었습니다!")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/BananaMagic.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/BananaMagic.kt
new file mode 100644
index 0000000..3e2ff42
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/BananaMagic.kt	
@@ -0,0 +1,16 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.Banana
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.BananaJuice
+
+class BananaMagic : Magic {
+    override fun createFruit() {
+        val banana = Banana()
+        println("과일 [${banana.name}]를 만들었습니다!")
+    }
+
+    override fun createJuice() {
+        val bananaJuice = BananaJuice()
+        println("과일주스 [${bananaJuice.name}]을 만들었습니다!")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/Magic.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/Magic.kt
new file mode 100644
index 0000000..2619de6
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/Magic.kt	
@@ -0,0 +1,35 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.FruitType
+
+interface Magic {
+    companion object {
+        fun getMagic(fruitType: FruitType): Magic {
+            return when (fruitType) {
+                FruitType.APPLE -> AppleMagic()
+                FruitType.BANANA -> BananaMagic()
+                FruitType.ORANGE -> OrangeMagic()
+            }
+        }
+    }
+
+    fun createFruit()
+
+    fun createJuice()
+}
+
+//abstract class Magic {
+//    companion object {
+//        fun getMagic(fruitType: FruitType): Magic {
+//            return when (fruitType) {
+//                FruitType.APPLE -> AppleMagic()
+//                FruitType.BANANA -> BananaMagic()
+//                FruitType.ORANGE -> OrangeMagic()
+//            }
+//        }
+//    }
+//
+//    abstract fun createFruit()
+//
+//    abstract fun createJuice()
+//}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/MagicApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/MagicApplication.kt
new file mode 100644
index 0000000..8b84596
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/MagicApplication.kt	
@@ -0,0 +1,12 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.FruitType
+
+class MagicApplication
+
+fun main() {
+    val fruitType = FruitType.APPLE
+    val magic = Magic.getMagic(fruitType)
+    magic.createFruit()
+    magic.createJuice()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/OrangeMagic.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/OrangeMagic.kt
new file mode 100644
index 0000000..416a5c7
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/after/OrangeMagic.kt	
@@ -0,0 +1,16 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.Orange
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.OrangeJuice
+
+class OrangeMagic : Magic {
+    override fun createFruit() {
+        val orange = Orange()
+        println("과일 [${orange.name}]를 만들었습니다!")
+    }
+
+    override fun createJuice() {
+        val orangeJuice = OrangeJuice()
+        println("과일주스 [${orangeJuice.name}]을 만들었습니다!")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/before/Magic.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/before/Magic.kt
new file mode 100644
index 0000000..c862ffe
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/before/Magic.kt	
@@ -0,0 +1,29 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.Apple
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.AppleJuice
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.Banana
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.BananaJuice
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.FruitType
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.Orange
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.OrangeJuice
+
+class Magic {
+    fun createFruit(type: FruitType) {
+        val fruit = when (type) {
+            FruitType.APPLE -> Apple()
+            FruitType.BANANA -> Banana()
+            FruitType.ORANGE -> Orange()
+        }
+        println("과일 [${fruit.name}]를 만들었습니다!")
+    }
+
+    fun createJuice(type: FruitType) {
+        val juice = when (type) {
+            FruitType.APPLE -> AppleJuice()
+            FruitType.BANANA -> BananaJuice()
+            FruitType.ORANGE -> OrangeJuice()
+        }
+        println("과일주스 [${juice.name}]을 만들었습니다!")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/before/MagicApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/before/MagicApplication.kt
new file mode 100644
index 0000000..8024408
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/before/MagicApplication.kt	
@@ -0,0 +1,12 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common.FruitType
+
+class MagicApplication
+
+fun main() {
+    val magic = Magic()
+    val fruitType = FruitType.APPLE
+    magic.createFruit(fruitType)
+    magic.createJuice(fruitType)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/common/FruitType.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/common/FruitType.kt
new file mode 100644
index 0000000..75c7333
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/common/FruitType.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common
+
+enum class FruitType {
+    APPLE,
+    BANANA,
+    ORANGE
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/common/Fruits.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/common/Fruits.kt
new file mode 100644
index 0000000..e83951a
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/common/Fruits.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common
+
+interface Fruit {
+    val name: String
+}
+
+data class Apple(override val name: String = "사과") : Fruit
+
+data class Banana(override val name: String = "바나나") : Fruit
+
+data class Orange(override val name: String = "오렌지") : Fruit
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/common/Juices.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/common/Juices.kt
new file mode 100644
index 0000000..2f266f3
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/abstractfactory/common/Juices.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.abstractfactory.common
+
+interface Juice {
+    val name: String
+}
+
+data class AppleJuice(override val name: String = "사과주스") : Juice
+
+data class BananaJuice(override val name: String = "바나나주스") : Juice
+
+data class OrangeJuice(override val name: String = "오렌지주스") : Juice
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/after/ElectricService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/after/ElectricService.kt
new file mode 100644
index 0000000..101915e
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/after/ElectricService.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.adapter.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common.HomeElectric
+
+interface ElectricService {
+    fun generateElectric(current: Int): HomeElectric
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/after/HomePowerStationElectricAdapter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/after/HomePowerStationElectricAdapter.kt
new file mode 100644
index 0000000..5d0d7be
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/after/HomePowerStationElectricAdapter.kt	
@@ -0,0 +1,15 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.adapter.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common.HomeElectric
+import com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common.PowerStation
+import com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common.PowerStationElectricRequest
+
+class HomePowerStationElectricAdapter(
+    private val powerStation: PowerStation
+): ElectricService {
+    override fun generateElectric(current: Int): HomeElectric {
+        val powerStationElectricRequest = PowerStationElectricRequest(current)
+        val powerStationElectric = powerStation.generateElectric(powerStationElectricRequest)
+        return powerStationElectric.toHomeElectric()
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/after/PowerStationApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/after/PowerStationApplication.kt
new file mode 100644
index 0000000..3deeb2a
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/after/PowerStationApplication.kt	
@@ -0,0 +1,16 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.adapter.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common.Home
+import com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common.PowerStation
+
+class PowerStationApplication
+
+fun main() {
+    val powerStation = PowerStation()
+    val homePowerStationElectricAdapter = HomePowerStationElectricAdapter(powerStation)
+
+    val homeElectric = homePowerStationElectricAdapter.generateElectric(1000)
+
+    val home = Home()
+    home.takeElectric(homeElectric) // 가정은 발전소의 전기를 사용하는 클라이언트 역할을 한다.
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/before/PowerStationApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/before/PowerStationApplication.kt
new file mode 100644
index 0000000..d4ff732
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/before/PowerStationApplication.kt	
@@ -0,0 +1,19 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.adapter.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common.Home
+import com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common.PowerStation
+import com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common.PowerStationElectricRequest
+
+class PowerStationApplication
+
+fun main() {
+    val powerStation = PowerStation()
+
+    val electricRequest = PowerStationElectricRequest(1000)
+    val powerStationElectric = powerStation.generateElectric(electricRequest)
+
+    val homeElectric = powerStationElectric.toHomeElectric()
+
+    val home = Home()
+    home.takeElectric(homeElectric) // 가정은 발전소의 전기를 사용하는 클라이언트 역할을 한다.
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/Home.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/Home.kt
new file mode 100644
index 0000000..d9aea56
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/Home.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common
+
+class Home(
+    private var electric: HomeElectric = HomeElectric(0)
+) {
+    fun takeElectric(electric: HomeElectric) {
+        this.electric = electric
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/HomeElectric.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/HomeElectric.kt
new file mode 100644
index 0000000..d4bfc8d
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/HomeElectric.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common
+
+data class HomeElectric(
+    val current: Int,
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/PowerStation.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/PowerStation.kt
new file mode 100644
index 0000000..b75ece9
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/PowerStation.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common
+
+class PowerStation {
+    fun generateElectric(request: PowerStationElectricRequest): PowerStationElectric {
+        return PowerStationElectric(request.current)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/PowerStationElectric.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/PowerStationElectric.kt
new file mode 100644
index 0000000..5f93f21
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/PowerStationElectric.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common
+
+data class PowerStationElectric(
+    val current: Int,
+) {
+    fun toHomeElectric(): HomeElectric {
+        return HomeElectric(this.current * (11000 / 220))
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/PowerStationElectricRequest.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/PowerStationElectricRequest.kt
new file mode 100644
index 0000000..f4f87cf
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/adapter/common/PowerStationElectricRequest.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.adapter.common
+
+data class PowerStationElectricRequest(
+    val current: Int
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/after/FranchiseeApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/after/FranchiseeApplication.kt
new file mode 100644
index 0000000..c1e9785
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/after/FranchiseeApplication.kt	
@@ -0,0 +1,17 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.composite.after
+
+class FranchiseeApplication
+
+fun main() {
+    val coffeeCorporation = FranchiseeCorporation("커피프린스")
+    coffeeCorporation.addStore(FranchiseeStore("1호점"))
+    coffeeCorporation.calculate()
+
+    println()
+    println("가맹점 정산을 완료했습니다.")
+    println()
+
+    val franchiseeCorporation = FranchiseeCorporation("모두의 프랜차이즈")
+    franchiseeCorporation.addStore(coffeeCorporation)
+    franchiseeCorporation.calculate()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/after/FranchiseeCorporation.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/after/FranchiseeCorporation.kt
new file mode 100644
index 0000000..a948dc8
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/after/FranchiseeCorporation.kt	
@@ -0,0 +1,21 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.composite.after
+
+class FranchiseeCorporation(
+    private val name: String,
+    private val stores: MutableList<Store> = mutableListOf()
+) : Store {
+    fun addStore(store: Store) {
+        stores.add(store)
+    }
+
+    fun removeStore(store: Store) {
+        stores.remove(store)
+    }
+
+    override fun calculate() {
+        for (store in stores) {
+            store.calculate()
+        }
+        println("프랜차이즈 기업 [$name]의 정산을 완료했습니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/after/FranchiseeStore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/after/FranchiseeStore.kt
new file mode 100644
index 0000000..1bef1a6
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/after/FranchiseeStore.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.composite.after
+
+class FranchiseeStore(
+    val name: String
+) : Store {
+    override fun calculate() {
+        println("프랜차이즈 가게 [$name]이(가) 정산을 진행합니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/after/Store.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/after/Store.kt
new file mode 100644
index 0000000..945e67a
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/after/Store.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.composite.after
+
+interface Store {
+    fun calculate()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/before/FranchiseeApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/before/FranchiseeApplication.kt
new file mode 100644
index 0000000..d72c099
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/before/FranchiseeApplication.kt	
@@ -0,0 +1,17 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.composite.before
+
+class FranchiseeApplication
+
+fun main() {
+    val coffeeCorporation = FranchiseeCorporation("커피프린스")
+    coffeeCorporation.addStore(FranchiseeStore("1호점"))
+    coffeeCorporation.calculateAllStores()
+
+    println()
+    println("가맹점 정산을 완료했습니다.")
+    println()
+
+    val franchiseeCorporation = FranchiseeCorporation("모두의 프랜차이즈")
+    franchiseeCorporation.addCorporation(coffeeCorporation)
+    franchiseeCorporation.calculateAllCorporations()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/before/FranchiseeCorporation.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/before/FranchiseeCorporation.kt
new file mode 100644
index 0000000..91994c2
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/before/FranchiseeCorporation.kt	
@@ -0,0 +1,37 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.composite.before
+
+class FranchiseeCorporation(
+    private val name: String,
+    private val corporations: MutableList<FranchiseeCorporation> = mutableListOf(),
+    private val stores: MutableList<FranchiseeStore> = mutableListOf()
+) {
+    fun addCorporation(franchiseeCorporation: FranchiseeCorporation) {
+        corporations.add(franchiseeCorporation)
+    }
+
+    fun removeCorporation(franchiseeCorporation: FranchiseeCorporation) {
+        corporations.remove(franchiseeCorporation)
+    }
+
+    fun addStore(store: FranchiseeStore) {
+        stores.add(store)
+    }
+
+    fun removeStore(store: FranchiseeStore) {
+        stores.remove(store)
+    }
+
+    fun calculateAllCorporations() {
+        for (corporation in corporations) {
+            corporation.calculateAllStores()
+        }
+        println("프랜차이즈 기업 [$name]의 정산을 완료했습니다.")
+    }
+
+    fun calculateAllStores() {
+        for (store in stores) {
+            store.calculate()
+        }
+        println("프랜차이즈 기업 [$name]의 정산을 완료했습니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/before/FranchiseeStore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/before/FranchiseeStore.kt
new file mode 100644
index 0000000..d74b9b6
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/composite/before/FranchiseeStore.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.composite.before
+
+class FranchiseeStore(
+    val name: String
+) {
+    fun calculate() {
+        println("프랜차이즈 가게 [$name]이(가) 정산을 진행합니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/Fire.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/Fire.kt
new file mode 100644
index 0000000..73dc3f2
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/Fire.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+class Fire(private val sword: Sword) : SwordDecorator() {
+    override fun skill(): String {
+        return "불꽃 ${sword.skill()}"
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/HeroApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/HeroApplication.kt
new file mode 100644
index 0000000..d7b635a
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/HeroApplication.kt	
@@ -0,0 +1,23 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Hero
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+class HeroApplication
+
+fun main() {
+    val hero = Hero()
+    hero.attack()
+
+    val fireSword = Fire(Sword.DEFAULT)
+    hero.changeSword(fireSword)
+    hero.attack()
+
+    val iceSword = Ice(Sword.DEFAULT)
+    hero.changeSword(iceSword)
+    hero.attack()
+
+    val fireIceSword = Fire(Ice(Sword.DEFAULT))
+    hero.changeSword(fireIceSword)
+    hero.attack()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/Ice.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/Ice.kt
new file mode 100644
index 0000000..726c1a7
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/Ice.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+class Ice(private val sword: Sword) : SwordDecorator() {
+    override fun skill(): String {
+        return "얼음 ${sword.skill()}"
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/SwordDecorator.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/SwordDecorator.kt
new file mode 100644
index 0000000..e1ced59
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/SwordDecorator.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+abstract class SwordDecorator : Sword()
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/FireIceSword.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/FireIceSword.kt
new file mode 100644
index 0000000..6e9b463
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/FireIceSword.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+class FireIceSword : Sword() {
+    override fun skill(): String {
+        return "화염 얼음 ${DEFAULT.skill()}"
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/FireSword.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/FireSword.kt
new file mode 100644
index 0000000..f6c3306
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/FireSword.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+class FireSword : Sword() {
+    override fun skill(): String {
+        return "화염 ${DEFAULT.skill()}"
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/HeroApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/HeroApplication.kt
new file mode 100644
index 0000000..5223d16
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/HeroApplication.kt	
@@ -0,0 +1,22 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Hero
+
+class HeroApplication
+
+fun main() {
+    val hero = Hero()
+    hero.attack()
+
+    val fireSword = FireSword()
+    hero.changeSword(fireSword)
+    hero.attack()
+
+    val iceSword = IceSword()
+    hero.changeSword(iceSword)
+    hero.attack()
+
+    val fireIceSword = FireIceSword()
+    hero.changeSword(fireIceSword)
+    hero.attack()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/IceSword.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/IceSword.kt
new file mode 100644
index 0000000..1ebe6f7
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/IceSword.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+class IceSword : Sword() {
+    override fun skill(): String {
+        return "얼음 ${DEFAULT.skill()}"
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/common/Hero.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/common/Hero.kt
new file mode 100644
index 0000000..ff38811
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/common/Hero.kt	
@@ -0,0 +1,14 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common
+
+class Hero(
+    private var sword: Sword = Sword.DEFAULT
+) {
+    fun changeSword(sword: Sword) {
+        this.sword = sword
+    }
+
+    fun attack() {
+        val swordSkill = sword.skill()
+        println("용사가 [$swordSkill]을 발동합니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/common/Sword.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/common/Sword.kt
new file mode 100644
index 0000000..5d622f6
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/common/Sword.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common
+
+abstract class Sword {
+    abstract fun skill(): String
+
+    companion object {
+        val DEFAULT = object : Sword() {
+            override fun skill(): String {
+                return "참격"
+            }
+        }
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/after/InformationFinder.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/after/InformationFinder.kt
new file mode 100644
index 0000000..ee8103e
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/after/InformationFinder.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.facade.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.Information
+
+interface InformationFinder {
+    fun findInformation(): Information
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/after/MemberApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/after/MemberApplication.kt
new file mode 100644
index 0000000..ccd0fd1
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/after/MemberApplication.kt	
@@ -0,0 +1,16 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.facade.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.FriendFinder
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.MemberFinder
+
+class MemberApplication
+
+fun main() {
+    val memberFinder = MemberFinder()
+    val friendFinder = FriendFinder()
+
+    val memberInformationFinder = MemberInformationFinder(memberFinder, friendFinder)
+
+    val memberInformation = memberInformationFinder.findInformation()
+    println(memberInformation)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/after/MemberInformationFinder.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/after/MemberInformationFinder.kt
new file mode 100644
index 0000000..92ae124
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/after/MemberInformationFinder.kt	
@@ -0,0 +1,17 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.facade.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.FriendFinder
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.Information
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.MemberFinder
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.MemberInformation
+
+class MemberInformationFinder(
+    private val memberFinder: MemberFinder,
+    private val friendFinder: FriendFinder,
+): InformationFinder {
+    override fun findInformation(): Information {
+        val member = memberFinder.findMember()
+        val friends = friendFinder.findFriends(member)
+        return MemberInformation(member, friends)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/before/MemberApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/before/MemberApplication.kt
new file mode 100644
index 0000000..b247b37
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/before/MemberApplication.kt	
@@ -0,0 +1,18 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.facade.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.FriendFinder
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.MemberFinder
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.MemberInformation
+
+class MemberApplication
+
+fun main() {
+    val memberFinder = MemberFinder()
+    val friendFinder = FriendFinder()
+
+    val member = memberFinder.findMember()
+    val friends = friendFinder.findFriends(member)
+
+    val memberInformation = MemberInformation(member, friends)
+    println(memberInformation)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/Friend.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/Friend.kt
new file mode 100644
index 0000000..7c3f4c6
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/Friend.kt	
@@ -0,0 +1,6 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.facade.common
+
+data class Friend(
+    val name: String,
+    val age: Int
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/FriendFinder.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/FriendFinder.kt
new file mode 100644
index 0000000..c19a76e
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/FriendFinder.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.facade.common
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.Friend
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.Member
+
+class FriendFinder {
+    fun findFriends(member: Member): List<Friend> {
+        return listOf(Friend("colt", 29))
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/FriendInformation.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/FriendInformation.kt
new file mode 100644
index 0000000..5b673bc
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/FriendInformation.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.facade.common
+
+data class FriendInformation(
+    val name: String,
+    val age: Int
+) : Information {
+    constructor(friend: Friend) : this(
+        name = friend.name,
+        age = friend.age
+    )
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/Information.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/Information.kt
new file mode 100644
index 0000000..ccc810d
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/Information.kt	
@@ -0,0 +1,3 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.facade.common
+
+interface Information
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/Member.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/Member.kt
new file mode 100644
index 0000000..c047f55
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/Member.kt	
@@ -0,0 +1,6 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.facade.common
+
+class Member(
+    val name: String,
+    val age: Int
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/MemberFinder.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/MemberFinder.kt
new file mode 100644
index 0000000..c8f70dc
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/MemberFinder.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.facade.common
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.facade.common.Member
+
+class MemberFinder {
+    fun findMember(): Member {
+        return Member("banjjoknim", 29)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/MemberInformation.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/MemberInformation.kt
new file mode 100644
index 0000000..c83ba2b
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/facade/common/MemberInformation.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.facade.common
+
+data class MemberInformation(
+    val memberName: String,
+    val memberAge: Int,
+    val friendsInformation: List<FriendInformation>
+): Information {
+    constructor(member: Member, friends: List<Friend>) : this(
+        memberName = member.name,
+        memberAge = member.age,
+        friendsInformation = friends.map { FriendInformation(it) }
+    )
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/AirConditioner.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/AirConditioner.kt
new file mode 100644
index 0000000..e675004
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/AirConditioner.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.mediator.after
+
+class AirConditioner(override val name: String) : HomeAppliance {
+    override fun turnOn() {
+        println("${name}을 켭니다.")
+    }
+
+    override fun turnOff() {
+        println("${name}을 끕니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/HomeAppliance.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/HomeAppliance.kt
new file mode 100644
index 0000000..5508e3b
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/HomeAppliance.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.mediator.after
+
+interface HomeAppliance {
+    val name: String
+
+    fun turnOn()
+
+    fun turnOff()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/HomeApplianceApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/HomeApplianceApplication.kt
new file mode 100644
index 0000000..6dd23f0
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/HomeApplianceApplication.kt	
@@ -0,0 +1,12 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.mediator.after
+
+class HomeApplianceApplication
+
+fun main() {
+    val airConditioner = AirConditioner("에어컨")
+    val television = Television("텔레비전")
+    val messageSender = MessageSender()
+    val remoteControl = RemoteControl(listOf(airConditioner, television), messageSender)
+
+    remoteControl.turnOn(airConditioner)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/MessageSender.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/MessageSender.kt
new file mode 100644
index 0000000..13904c7
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/MessageSender.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.mediator.after
+
+class MessageSender {
+    fun sendMessage(homeAppliance: HomeAppliance) {
+        println("메시지 : ${homeAppliance.name}을 켰습니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/RemoteControl.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/RemoteControl.kt
new file mode 100644
index 0000000..0436c4f
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/RemoteControl.kt	
@@ -0,0 +1,17 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.mediator.after
+
+class RemoteControl(
+    private val homeAppliances: List<HomeAppliance>,
+    private val messageSender: MessageSender
+) {
+    fun turnOn(homeAppliance: HomeAppliance) {
+        homeAppliances.filterNot { it == homeAppliance }
+            .forEach { it.turnOff() }
+        homeAppliance.turnOn()
+        messageSender.sendMessage(homeAppliance)
+    }
+
+    fun turnOff(homeAppliance: HomeAppliance) {
+        homeAppliance.turnOff()
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/Television.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/Television.kt
new file mode 100644
index 0000000..48366a5
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/after/Television.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.mediator.after
+
+class Television(override val name: String) : HomeAppliance {
+    override fun turnOn() {
+        println("${name}을 켭니다.")
+    }
+
+    override fun turnOff() {
+        println("${name}을 끕니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/AirConditioner.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/AirConditioner.kt
new file mode 100644
index 0000000..5c7e3a9
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/AirConditioner.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.mediator.before
+
+class AirConditioner(override val name: String) : HomeAppliance {
+    override fun turnOnBut(homeAppliance: HomeAppliance, messageSender: MessageSender) {
+        homeAppliance.turnOff()
+        println("${name}을 켭니다.")
+        messageSender.sendMessage(this)
+    }
+
+    override fun turnOff() {
+        println("${name}을 끕니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/HomeAppliance.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/HomeAppliance.kt
new file mode 100644
index 0000000..13038ed
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/HomeAppliance.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.mediator.before
+
+interface HomeAppliance {
+    val name: String
+
+    fun turnOnBut(homeAppliance: HomeAppliance, messageSender: MessageSender)
+
+    fun turnOff()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/HomeApplianceApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/HomeApplianceApplication.kt
new file mode 100644
index 0000000..b3d2365
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/HomeApplianceApplication.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.mediator.before
+
+class HomeApplianceApplication
+
+fun main() {
+    val airConditioner = AirConditioner("에어컨")
+    val television = Television("텔레비전")
+    val messageSender = MessageSender()
+
+    airConditioner.turnOnBut(television, messageSender)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/MessageSender.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/MessageSender.kt
new file mode 100644
index 0000000..6068444
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/MessageSender.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.mediator.before
+
+class MessageSender {
+    fun sendMessage(homeAppliance: HomeAppliance) {
+        println("메시지 : ${homeAppliance.name}을 켰습니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/Television.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/Television.kt
new file mode 100644
index 0000000..588ab65
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/mediator/before/Television.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.mediator.before
+
+class Television(override val name: String) : HomeAppliance {
+    override fun turnOnBut(homeAppliance: HomeAppliance, messageSender: MessageSender) {
+        homeAppliance.turnOff()
+        println("${name}을 켭니다.")
+        messageSender.sendMessage(this)
+    }
+
+    override fun turnOff() {
+        println("${name}을 끕니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/after/Employee.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/after/Employee.kt
new file mode 100644
index 0000000..48d717d
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/after/Employee.kt	
@@ -0,0 +1,23 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.nill.after
+
+interface Employee {
+    companion object {
+        val NOT_FOUND = object : Employee {
+            override val name: String
+                get() = "존재하지 않음"
+
+            override fun memorizeWorkingDays(workingDays: List<Int>) {
+                // 아무 작업도 하지 않는다.
+            }
+        }
+    }
+
+    val name: String
+    var workingDays: List<Int>
+        get() = listOf()
+        set(workingDays) {
+            memorizeWorkingDays(workingDays)
+        }
+
+    fun memorizeWorkingDays(workingDays: List<Int>)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/after/Restaurant.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/after/Restaurant.kt
new file mode 100644
index 0000000..aaf15ca
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/after/Restaurant.kt	
@@ -0,0 +1,28 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.nill.after
+
+class Restaurant(
+    private val employees: MutableList<Employee> = mutableListOf()
+) {
+    fun addEmployee(employee: Employee) {
+        employees.add(employee)
+    }
+
+    fun removeEmployee(employee: Employee) {
+        employees.remove(employee)
+    }
+
+    fun showAllEmployeesWorkingDays() {
+        for (employee in employees) {
+            println("${employee.name}의 근무일은 ${employee.workingDays}일 입니다.")
+        }
+    }
+
+    fun assignWorkingDays(workingDays: List<Int>, employeeName: String) {
+        val employee = findEmployee(employeeName)
+        employee.memorizeWorkingDays(workingDays)
+    }
+
+    private fun findEmployee(employeeName: String): Employee {
+        return employees.find { it.name == employeeName } ?: Employee.NOT_FOUND
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/after/RestaurantApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/after/RestaurantApplication.kt
new file mode 100644
index 0000000..4df3fea
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/after/RestaurantApplication.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.nill.after
+
+class RestaurantApplication
+
+fun main() {
+    val restaurant = Restaurant()
+    restaurant.addEmployee(WorkingEmployee("banjjoknim"))
+
+    restaurant.assignWorkingDays(listOf(1, 4, 7, 14, 20, 27), "banjjoknim")
+    restaurant.assignWorkingDays(listOf(2, 5, 10, 17, 23, 29), "colt")
+
+    restaurant.showAllEmployeesWorkingDays()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/after/WorkingEmployee.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/after/WorkingEmployee.kt
new file mode 100644
index 0000000..29ebe6c
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/after/WorkingEmployee.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.nill.after
+
+class WorkingEmployee(
+    override val name: String,
+    override var workingDays: List<Int> = listOf()
+) : Employee {
+    override fun memorizeWorkingDays(workingDays: List<Int>) {
+        this.workingDays = workingDays
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/before/Employee.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/before/Employee.kt
new file mode 100644
index 0000000..7324fdd
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/before/Employee.kt	
@@ -0,0 +1,25 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.nill.before
+
+class Employee(
+    val name: String,
+    var workingDays: List<Int> = listOf()
+) {
+    fun memorizeWorkingDays(workingDays: List<Int>) {
+        this.workingDays = workingDays
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as Employee
+
+        if (name != other.name) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        return name.hashCode()
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/before/Restaurant.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/before/Restaurant.kt
new file mode 100644
index 0000000..5fa0dc2
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/before/Restaurant.kt	
@@ -0,0 +1,30 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.nill.before
+
+class Restaurant(
+    private val employees: MutableList<Employee> = mutableListOf()
+) {
+    fun addEmployee(employee: Employee) {
+        employees.add(employee)
+    }
+
+    fun removeEmployee(employee: Employee) {
+        employees.remove(employee)
+    }
+
+    fun showAllEmployeesWorkingDays() {
+        for (employee in employees) {
+            println("${employee.name}의 근무일은 ${employee.workingDays}일 입니다.")
+        }
+    }
+
+    fun assignWorkingDays(workingDays: List<Int>, employeeName: String) {
+        val employee = findEmployee(employeeName)
+        if (employee != null) {
+            employee.memorizeWorkingDays(workingDays)
+        }
+    }
+
+    private fun findEmployee(employeeName: String): Employee? {
+        return employees.find { it.name == employeeName }
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/before/RestaurantApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/before/RestaurantApplication.kt
new file mode 100644
index 0000000..fe9c11b
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/nill/before/RestaurantApplication.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.nill.before
+
+class RestaurantApplication
+
+fun main() {
+    val restaurant = Restaurant()
+    restaurant.addEmployee(Employee("banjjoknim"))
+
+    restaurant.assignWorkingDays(listOf(1, 4, 7, 14, 20, 27), "banjjoknim")
+    restaurant.assignWorkingDays(listOf(2, 5, 10, 17, 23, 29), "colt")
+
+    restaurant.showAllEmployeesWorkingDays()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/DeliveryTeam.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/DeliveryTeam.kt
new file mode 100644
index 0000000..8212d2a
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/DeliveryTeam.kt	
@@ -0,0 +1,12 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.observer.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.observer.common.OrderState
+
+class DeliveryTeam : Team {
+    override val name: String
+        get() = "배송팀"
+
+    override fun onNotice(state: OrderState) {
+        println("$name : 주문이 ${state.description} 상태로 변경되었네요. 배송을 시작합니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/ManageTeam.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/ManageTeam.kt
new file mode 100644
index 0000000..66567f7
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/ManageTeam.kt	
@@ -0,0 +1,12 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.observer.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.observer.common.OrderState
+
+class ManageTeam : Team {
+    override val name: String
+        get() = "운영팀"
+
+    override fun onNotice(state: OrderState) {
+        println("$name : 주문이 ${state.description} 상태로 변경되었네요. 소비자에게 메시지를 전송합니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/Order.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/Order.kt
new file mode 100644
index 0000000..2f94bda
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/Order.kt	
@@ -0,0 +1,21 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.observer.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.observer.common.OrderState
+
+class Order(
+    private var state: OrderState = OrderState.RECEIVED,
+    private val teams: MutableList<Team> = mutableListOf()
+) {
+    fun addTeam(team: Team) {
+        this.teams.add(team)
+    }
+
+    fun removeTeam(team: Team) {
+        this.teams.remove(team)
+    }
+
+    fun changeState(state: OrderState) {
+        this.state = state
+        teams.forEach { it.onNotice(state) }
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/OrderApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/OrderApplication.kt
new file mode 100644
index 0000000..d0cb1be
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/OrderApplication.kt	
@@ -0,0 +1,12 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.observer.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.observer.common.OrderState
+
+class OrderApplication
+
+fun main() {
+    val order = Order()
+    order.addTeam(DeliveryTeam())
+    order.addTeam(ManageTeam())
+    order.changeState(OrderState.DELIVERY_READY_COMPLETE)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/Team.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/Team.kt
new file mode 100644
index 0000000..0cd62e0
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/after/Team.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.observer.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.observer.common.OrderState
+
+interface Team {
+    val name: String
+
+    fun onNotice(state: OrderState)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/before/DeliveryTeam.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/before/DeliveryTeam.kt
new file mode 100644
index 0000000..2a45e16
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/before/DeliveryTeam.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.observer.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.observer.common.OrderState
+
+class DeliveryTeam {
+    fun doDelivery(state: OrderState) {
+        println("배송팀 : 주문이 ${state.description} 상태로 변경되었네요. 배송을 시작합니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/before/ManageTeam.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/before/ManageTeam.kt
new file mode 100644
index 0000000..3bd03c1
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/before/ManageTeam.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.observer.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.observer.common.OrderState
+
+class ManageTeam {
+    fun sendMessage(state: OrderState) {
+        println("운영팀 : 주문이 ${state.description} 상태로 변경되었네요. 소비자에게 메시지를 전송합니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/before/Order.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/before/Order.kt
new file mode 100644
index 0000000..1596d73
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/before/Order.kt	
@@ -0,0 +1,15 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.observer.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.observer.common.OrderState
+
+class Order(
+    private var state: OrderState = OrderState.RECEIVED,
+    private val deliveryTeam: DeliveryTeam,
+    private val manageTeam: ManageTeam
+) {
+    fun changeState(state: OrderState) {
+        this.state = state
+        deliveryTeam.doDelivery(state)
+        manageTeam.sendMessage(state)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/before/OrderApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/before/OrderApplication.kt
new file mode 100644
index 0000000..7bf2021
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/before/OrderApplication.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.observer.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.observer.common.OrderState
+
+class OrderApplication
+
+fun main() {
+    val order = Order(state = OrderState.RECEIVED, DeliveryTeam(), ManageTeam())
+    order.changeState(OrderState.DELIVERY_READY_COMPLETE)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/common/OrderState.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/common/OrderState.kt
new file mode 100644
index 0000000..ab881ad
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/observer/common/OrderState.kt	
@@ -0,0 +1,8 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.observer.common
+
+enum class OrderState(
+    val description: String
+) {
+    RECEIVED("접수됨"),
+    DELIVERY_READY_COMPLETE("배송 준비")
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/ExtendsProxyWallet.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/ExtendsProxyWallet.kt
new file mode 100644
index 0000000..1a3e5ed
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/ExtendsProxyWallet.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.proxy.after
+
+class ExtendsProxyWallet(balance: Int) : RealWallet(balance) {
+    override fun deposit(amount: Int) {
+        println("지갑에 $amount 원이 입금되었습니다.")
+        super.deposit(amount)
+    }
+
+    override fun withdrawal(amount: Int) {
+        println("지갑에서 $amount 원이 출금되었습니다.")
+        super.withdrawal(amount)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/ImplementsProxyWallet.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/ImplementsProxyWallet.kt
new file mode 100644
index 0000000..d9e0e8c
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/ImplementsProxyWallet.kt	
@@ -0,0 +1,15 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.proxy.after
+
+class ImplementsProxyWallet(
+    private val realWallet: RealWallet
+) : Wallet {
+    override fun deposit(amount: Int) {
+        println("지갑에 $amount 원이 입금되었습니다.")
+        realWallet.deposit(amount)
+    }
+
+    override fun withdrawal(amount: Int) {
+        println("지갑에서 $amount 원이 출금되었습니다.")
+        realWallet.withdrawal(amount)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/Owner.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/Owner.kt
new file mode 100644
index 0000000..82b88da
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/Owner.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.proxy.after
+
+class Owner(
+    private val wallet: Wallet
+) {
+    fun deposit(amount: Int) {
+        wallet.deposit(amount)
+    }
+
+    fun withdrawal(amount: Int) {
+        wallet.withdrawal(amount)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/RealWallet.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/RealWallet.kt
new file mode 100644
index 0000000..2d3f403
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/RealWallet.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.proxy.after
+
+open class RealWallet(
+    private var balance: Int = 0
+) : Wallet {
+    override fun deposit(amount: Int) {
+        this.balance += amount
+    }
+
+    override fun withdrawal(amount: Int) {
+        this.balance -= amount
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/Wallet.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/Wallet.kt
new file mode 100644
index 0000000..22a7a57
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/Wallet.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.proxy.after
+
+interface Wallet {
+    fun deposit(amount: Int)
+
+    fun withdrawal(amount: Int)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/WalletApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/WalletApplication.kt
new file mode 100644
index 0000000..64e2499
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/after/WalletApplication.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.proxy.after
+
+class ProxyWalletApplication
+
+fun main() {
+    val wallet = ImplementsProxyWallet(RealWallet())
+    val owner = Owner(wallet)
+    owner.deposit(1000)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/before/Owner.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/before/Owner.kt
new file mode 100644
index 0000000..861b7bb
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/before/Owner.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.proxy.before
+
+class Owner(
+    private val wallet: Wallet
+) {
+    fun deposit(amount: Int) {
+        wallet.deposit(amount)
+    }
+
+    fun withdrawal(amount: Int) {
+        wallet.withdrawal(amount)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/before/Wallet.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/before/Wallet.kt
new file mode 100644
index 0000000..73e2af3
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/before/Wallet.kt	
@@ -0,0 +1,15 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.proxy.before
+
+class Wallet(
+    private var balance: Int = 0
+) {
+    fun deposit(amount: Int) {
+        println("지갑에 $amount 원이 입금되었습니다.")
+        this.balance += amount
+    }
+
+    fun withdrawal(amount: Int) {
+        println("지갑에서 $amount 원이 출금되었습니다.")
+        this.balance -= amount
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/before/WalletApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/before/WalletApplication.kt
new file mode 100644
index 0000000..0033986
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/proxy/before/WalletApplication.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.proxy.before
+
+class WalletApplication
+
+fun main() {
+    val wallet = Wallet()
+    val owner = Owner(wallet)
+    owner.deposit(1000)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/GameCharacter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/GameCharacter.kt
new file mode 100644
index 0000000..e76424f
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/GameCharacter.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.after
+
+class GameCharacter(
+    private var state: State = StoppingState()
+) {
+    fun move() {
+        state.move(this)
+    }
+
+    fun changeState(newState: State) {
+        this.state = newState
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/GameCharacterApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/GameCharacterApplication.kt
new file mode 100644
index 0000000..a117167
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/GameCharacterApplication.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.after
+
+class GameCharacterApplicationAfter
+
+fun main() {
+    val gameCharacter = GameCharacter()
+    gameCharacter.move()
+    gameCharacter.move()
+    gameCharacter.move()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/State.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/State.kt
new file mode 100644
index 0000000..161b57f
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/State.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.after
+
+interface State {
+    fun move(gameCharacter: GameCharacter)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/States.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/States.kt
new file mode 100644
index 0000000..1108b77
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/States.kt	
@@ -0,0 +1,22 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.after
+
+class StoppingState : State {
+    override fun move(gameCharacter: GameCharacter) {
+        println("캐릭터가 이동한다.")
+        gameCharacter.changeState(MovingState())
+    }
+}
+
+class MovingState : State {
+    override fun move(gameCharacter: GameCharacter) {
+        println("캐릭터가 점프한다.")
+        gameCharacter.changeState(JumpingState())
+    }
+}
+
+class JumpingState : State {
+    override fun move(gameCharacter: GameCharacter) {
+        println("캐릭터가 착지한 뒤 정지한다.")
+        gameCharacter.changeState(StoppingState())
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/GameCharacter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/GameCharacter.kt
new file mode 100644
index 0000000..d3a2370
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/GameCharacter.kt	
@@ -0,0 +1,22 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.before
+
+class GameCharacter(
+    private var state: State = State.STOPPING
+) {
+    fun move() {
+        when (state) {
+            State.STOPPING -> {
+                println("캐릭터가 이동한다.")
+                this.state = State.MOVING
+            }
+            State.MOVING -> {
+                println("캐릭터가 점프한다.")
+                this.state = State.JUMPING
+            }
+            State.JUMPING -> {
+                println("캐릭터가 착지한 뒤 정지한다.")
+                this.state = State.STOPPING
+            }
+        }
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/GameCharacterApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/GameCharacterApplication.kt
new file mode 100644
index 0000000..629df44
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/GameCharacterApplication.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.before
+
+class GameCharacterApplicationBefore
+
+fun main() {
+    val gameCharacter = GameCharacter()
+    gameCharacter.move()
+    gameCharacter.move()
+    gameCharacter.move()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/State.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/State.kt
new file mode 100644
index 0000000..9eb021c
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/State.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.before
+
+enum class State {
+    STOPPING,
+    MOVING,
+    JUMPING,
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/after/AgeTypeAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/after/AgeTypeAfter.kt
new file mode 100644
index 0000000..dd707c7
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/after/AgeTypeAfter.kt	
@@ -0,0 +1,6 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.strategy.after
+
+enum class AgeTypeAfter(val discountPolicy: DiscountPolicy) {
+    KIDS(DiscountPolicy { price -> price * 70 / 100 }),
+    ADULTS(DiscountPolicy { price -> price * 90 / 100 }),
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/after/PriceCalculatorAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/after/PriceCalculatorAfter.kt
new file mode 100644
index 0000000..665156c
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/after/PriceCalculatorAfter.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.strategy.after
+
+class PriceCalculatorAfter {
+    fun calculate(price: Int, discountPolicy: DiscountPolicy): Int {
+        return discountPolicy.calculate(price)
+    }
+}
+
+fun interface DiscountPolicy {
+    fun calculate(price: Int): Int
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/after/PriceCalculatorApplicationAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/after/PriceCalculatorApplicationAfter.kt
new file mode 100644
index 0000000..5de0bc1
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/after/PriceCalculatorApplicationAfter.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.strategy.after
+
+class PriceCalculatorApplicationAfter
+
+fun main() {
+    val priceCalculator = PriceCalculatorAfter()
+    val price = 10000
+    val ageType = AgeTypeAfter.KIDS
+    val calculatedPrice = priceCalculator.calculate(price, ageType.discountPolicy)
+    println(calculatedPrice)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/before/AgeTypeBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/before/AgeTypeBefore.kt
new file mode 100644
index 0000000..8e52a9d
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/before/AgeTypeBefore.kt	
@@ -0,0 +1,6 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.strategy.before
+
+enum class AgeTypeBefore {
+    KIDS,
+    ADULTS,
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/before/PriceCalculatorApplicationBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/before/PriceCalculatorApplicationBefore.kt
new file mode 100644
index 0000000..d3dcc1f
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/before/PriceCalculatorApplicationBefore.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.strategy.before
+
+class PriceCalculatorApplicationBefore
+
+fun main() {
+    val priceCalculator = PriceCalculatorBefore()
+    val price = 10000
+    val ageTypeBefore = AgeTypeBefore.ADULTS
+    val calculatedPrice = priceCalculator.calculate(price, ageTypeBefore)
+    println(calculatedPrice)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/before/PriceCalculatorBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/before/PriceCalculatorBefore.kt
new file mode 100644
index 0000000..b0764b8
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/strategy/before/PriceCalculatorBefore.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.strategy.before
+
+class PriceCalculatorBefore {
+    fun calculate(price: Int, ageType: AgeTypeBefore): Int {
+        return when (ageType) {
+            AgeTypeBefore.KIDS -> price * 70 / 100
+            AgeTypeBefore.ADULTS -> price * 85 / 100
+        }
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/after/SoccerInstructorAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/after/SoccerInstructorAfter.kt
new file mode 100644
index 0000000..bb9a227
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/after/SoccerInstructorAfter.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.templatemethod.after
+
+class SoccerInstructorAfter : SportsInstructor() {
+    override fun showMovements() {
+        println("축구 동작을 보여준다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/after/SportsInstructor.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/after/SportsInstructor.kt
new file mode 100644
index 0000000..6dd7a51
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/after/SportsInstructor.kt	
@@ -0,0 +1,19 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.templatemethod.after
+
+abstract class SportsInstructor {
+    fun startLesson() {
+        showStretching()
+        showMovements()
+        greeting()
+    }
+
+    private fun showStretching() {
+        println("스트레칭을 한다.")
+    }
+
+    protected abstract fun showMovements()
+
+    private fun greeting() {
+        println("인사를 한다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/after/SportsInstructorApplicationAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/after/SportsInstructorApplicationAfter.kt
new file mode 100644
index 0000000..1bb752c
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/after/SportsInstructorApplicationAfter.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.templatemethod.after
+
+class SportsInstructorApplicationAfter
+
+fun main() {
+    val swimmingInstructor = SwimmingInstructorAfter()
+    swimmingInstructor.startLesson()
+    val soccerInstructor = SoccerInstructorAfter()
+    soccerInstructor.startLesson()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/after/SwimmingInstructorAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/after/SwimmingInstructorAfter.kt
new file mode 100644
index 0000000..cd2fe6b
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/after/SwimmingInstructorAfter.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.templatemethod.after
+
+class SwimmingInstructorAfter : SportsInstructor() {
+    override fun showMovements() {
+        println("수영 동작을 보여준다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/before/SoccerInstructorBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/before/SoccerInstructorBefore.kt
new file mode 100644
index 0000000..08e46cf
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/before/SoccerInstructorBefore.kt	
@@ -0,0 +1,21 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.templatemethod.before
+
+class SoccerInstructorBefore {
+    fun startLesson() {
+        showStretching()
+        showSoccerMovements()
+        greeting()
+    }
+
+    private fun showStretching() {
+        println("스트레칭을 한다.")
+    }
+
+    private fun showSoccerMovements() {
+        println("축구 동작을 보여준다.")
+    }
+
+    private fun greeting() {
+        println("인사를 한다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/before/SportsInstructorApplicationBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/before/SportsInstructorApplicationBefore.kt
new file mode 100644
index 0000000..fa20039
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/before/SportsInstructorApplicationBefore.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.templatemethod.before
+
+class SportsInstructorApplicationBefore
+
+fun main() {
+    val swimmingTeacher = SwimmingInstructorBefore()
+    swimmingTeacher.startLesson()
+    val soccerTeacher = SoccerInstructorBefore()
+    soccerTeacher.startLesson()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/before/SwimmingInstructorBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/before/SwimmingInstructorBefore.kt
new file mode 100644
index 0000000..00ca81d
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/templatemethod/before/SwimmingInstructorBefore.kt	
@@ -0,0 +1,21 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.templatemethod.before
+
+class SwimmingInstructorBefore {
+    fun startLesson() {
+        showStretching()
+        showSwimming()
+        greeting()
+    }
+
+    private fun showStretching() {
+        println("스트레칭을 한다.")
+    }
+
+    private fun showSwimming() {
+        println("수영 동작을 보여준다.")
+    }
+
+    private fun greeting() {
+        println("인사를 한다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/AmazonStorageService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/AmazonStorageService.kt
new file mode 100644
index 0000000..21ea736
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/AmazonStorageService.kt	
@@ -0,0 +1,19 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.AmazonStorage
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.AmazonStorageReadFileRequest
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.ReadFileRequest
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.StorageFile
+import org.springframework.stereotype.Service
+
+@Service
+class AmazonStorageService : StorageService {
+    override fun readStorageFile(request: ReadFileRequest): StorageFile {
+        val storage = AmazonStorage()
+        val amazonStorageReadFileRequest = object : AmazonStorageReadFileRequest {
+            override val fileName: String
+                get() = request.fileInformation
+        }
+        return storage.provideStorageFile(amazonStorageReadFileRequest)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/GoogleStorageService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/GoogleStorageService.kt
new file mode 100644
index 0000000..a209b54
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/GoogleStorageService.kt	
@@ -0,0 +1,19 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.GoogleStorage
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.GoogleStorageReadFileRequest
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.ReadFileRequest
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.StorageFile
+import org.springframework.stereotype.Component
+
+@Component
+class GoogleStorageService : StorageService {
+    override fun readStorageFile(request: ReadFileRequest): StorageFile {
+        val storage = GoogleStorage()
+        val googleStorageReadFileRequest = object : GoogleStorageReadFileRequest {
+            override val fileNumber: Int
+                get() = request.fileInformation.toInt()
+        }
+        return storage.provideStorageFile(googleStorageReadFileRequest)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/StorageControllerAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/StorageControllerAfter.kt
new file mode 100644
index 0000000..bb5b822
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/StorageControllerAfter.kt	
@@ -0,0 +1,18 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.ReadFileRequest
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.StorageFile
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/storages")
+@RestController
+class StorageControllerAfter(
+    private val storageService: StorageService
+) {
+    @GetMapping("/with-dip")
+    fun readStorageFile(request: ReadFileRequest): StorageFile {
+        return storageService.readStorageFile(request)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/StorageService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/StorageService.kt
new file mode 100644
index 0000000..768ffb0
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/StorageService.kt	
@@ -0,0 +1,8 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.ReadFileRequest
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.StorageFile
+
+interface StorageService {
+    fun readStorageFile(request: ReadFileRequest): StorageFile
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/StorageServiceConfiguration.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/StorageServiceConfiguration.kt
new file mode 100644
index 0000000..3acf3e7
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/after/StorageServiceConfiguration.kt	
@@ -0,0 +1,24 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.after
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+
+@Configuration
+class StorageServiceConfiguration {
+
+    /**
+     * AmazonStorageService 를 적용하고 싶은 경우
+     */
+    @Bean
+    fun storageService(): StorageService {
+        return AmazonStorageService()
+    }
+
+    /**
+     * GoogleStorageService 를 적용하고 싶은 경우
+     */
+//    @Bean
+//    fun storageService(): StorageService {
+//        return GoogleStorageService()
+//    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/before/StorageControllerBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/before/StorageControllerBefore.kt
new file mode 100644
index 0000000..19c615a
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/before/StorageControllerBefore.kt	
@@ -0,0 +1,26 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.dip.after.AmazonStorageService
+import com.banjjoknim.soliddesignpatternsample.solid.dip.after.GoogleStorageService
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.ReadFileRequest
+import com.banjjoknim.soliddesignpatternsample.solid.dip.common.StorageFile
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RequestParam
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/storages")
+@RestController
+class StorageControllerBefore(
+    private val amazonStorageService: AmazonStorageService,
+    private val googleStorageService: GoogleStorageService,
+) {
+    @GetMapping("/none-dip")
+    fun readStorageFile(@RequestParam storageType: StorageType, @RequestParam fileInformation: String): StorageFile {
+        val readFileRequest = ReadFileRequest(fileInformation)
+        return when (storageType) {
+            StorageType.AMAZON -> amazonStorageService.readStorageFile(readFileRequest)
+            StorageType.GOOGLE -> googleStorageService.readStorageFile(readFileRequest)
+        }
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/before/StorageType.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/before/StorageType.kt
new file mode 100644
index 0000000..0b2164e
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/before/StorageType.kt	
@@ -0,0 +1,6 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.before
+
+enum class StorageType {
+    AMAZON,
+    GOOGLE
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/AmazonStorage.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/AmazonStorage.kt
new file mode 100644
index 0000000..53ad2b2
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/AmazonStorage.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.common
+
+class AmazonStorage {
+    fun provideStorageFile(request: AmazonStorageReadFileRequest): StorageFile {
+        return StorageFile("${request.fileName} data from amazon")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/AmazonStorageReadFileRequest.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/AmazonStorageReadFileRequest.kt
new file mode 100644
index 0000000..75f0614
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/AmazonStorageReadFileRequest.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.common
+
+interface AmazonStorageReadFileRequest {
+    val fileName: String
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/GoogleStorage.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/GoogleStorage.kt
new file mode 100644
index 0000000..f62af11
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/GoogleStorage.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.common
+
+class GoogleStorage {
+    fun provideStorageFile(request: GoogleStorageReadFileRequest): StorageFile {
+        return StorageFile("${request.fileNumber} data from amazon")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/GoogleStorageReadFileRequest.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/GoogleStorageReadFileRequest.kt
new file mode 100644
index 0000000..a793716
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/GoogleStorageReadFileRequest.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.common
+
+interface GoogleStorageReadFileRequest {
+    val fileNumber: Int
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/ReadFileRequest.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/ReadFileRequest.kt
new file mode 100644
index 0000000..ce48ecb
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/ReadFileRequest.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.common
+
+data class ReadFileRequest(
+    val fileInformation: String
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/StorageFile.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/StorageFile.kt
new file mode 100644
index 0000000..1890897
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/dip/common/StorageFile.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.solid.dip.common
+
+data class StorageFile(
+    val data: String
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/CinemaControllerAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/CinemaControllerAfter.kt
new file mode 100644
index 0000000..4998ee9
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/CinemaControllerAfter.kt	
@@ -0,0 +1,25 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/cinemas")
+@RestController
+class CinemaControllerAfter(
+    private val seatStatusService: SeatStatusServiceAfter,
+    private val reservationService: ReservationServiceAfter
+) {
+    @GetMapping("/with-isp-get-seat-status")
+    fun getSeatStatus(): SeatStatus {
+        return seatStatusService.getSeatStatus()
+    }
+
+    @PostMapping("/with-isp-make-reservation")
+    fun makeReservation(): Reservation {
+        return reservationService.makeReservation()
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/ReservationService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/ReservationService.kt
new file mode 100644
index 0000000..85b60ef
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/ReservationService.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+
+interface ReservationService {
+    fun makeReservation(): Reservation
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/ReservationServiceAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/ReservationServiceAfter.kt
new file mode 100644
index 0000000..c30265c
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/ReservationServiceAfter.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+import org.springframework.stereotype.Service
+
+@Service
+class ReservationServiceAfter : ReservationService {
+    override fun makeReservation(): Reservation {
+        return Reservation(seat = "A1", id = 1L)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/SeatStatusService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/SeatStatusService.kt
new file mode 100644
index 0000000..dc53340
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/SeatStatusService.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+
+interface SeatStatusService {
+    fun getSeatStatus(): SeatStatus
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/SeatStatusServiceAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/SeatStatusServiceAfter.kt
new file mode 100644
index 0000000..3a97a82
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/SeatStatusServiceAfter.kt	
@@ -0,0 +1,12 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatusType
+import org.springframework.stereotype.Service
+
+@Service
+class SeatStatusServiceAfter : SeatStatusService {
+    override fun getSeatStatus(): SeatStatus {
+        return SeatStatus(SeatStatusType.CAN_RESERVATION)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/CinemaControllerBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/CinemaControllerBefore.kt
new file mode 100644
index 0000000..40791ca
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/CinemaControllerBefore.kt	
@@ -0,0 +1,25 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/cinemas")
+@RestController
+class CinemaControllerBefore(
+    private val seatStatusService: SeatStatusServiceBefore,
+    private val reservationService: ReservationServiceBefore,
+) {
+    @GetMapping("/none-isp-get-seat-status")
+    fun getSeatStatus(): SeatStatus {
+        return seatStatusService.getSeatStatus()
+    }
+
+    @PostMapping("/none-isp-make-reservation")
+    fun makeReservation(): Reservation {
+        return reservationService.makeReservation()
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/CinemaService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/CinemaService.kt
new file mode 100644
index 0000000..538a7aa
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/CinemaService.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+
+interface CinemaService {
+    fun makeReservation(): Reservation
+
+    fun getSeatStatus(): SeatStatus
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/ReservationServiceBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/ReservationServiceBefore.kt
new file mode 100644
index 0000000..5680588
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/ReservationServiceBefore.kt	
@@ -0,0 +1,16 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+import org.springframework.stereotype.Service
+
+@Service
+class ReservationServiceBefore : CinemaService {
+    override fun makeReservation(): Reservation {
+        return Reservation(seat = "A1", id = 1L)
+    }
+
+    override fun getSeatStatus(): SeatStatus {
+        throw UnsupportedOperationException("좌석 현황 조회는 지원하지 않습니다.") // 불필요함에도 불구하고 구현해주어야 한다.
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/SeatStatusServiceBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/SeatStatusServiceBefore.kt
new file mode 100644
index 0000000..db6a95e
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/SeatStatusServiceBefore.kt	
@@ -0,0 +1,17 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatusType
+import org.springframework.stereotype.Service
+
+@Service
+class SeatStatusServiceBefore : CinemaService {
+    override fun makeReservation(): Reservation {
+        throw UnsupportedOperationException("영화표 예매는 지원하지 않습니다.") // 불필요함에도 불구하고 구현해주어야 한다.
+    }
+
+    override fun getSeatStatus(): SeatStatus {
+        return SeatStatus(SeatStatusType.CAN_RESERVATION)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/common/Reservation.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/common/Reservation.kt
new file mode 100644
index 0000000..c3cdfad
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/common/Reservation.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.common
+
+import javax.persistence.Entity
+import javax.persistence.Id
+
+@Entity
+class Reservation(
+    val seat: String,
+    @Id
+    val id: Long = 0L
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/common/SeatStatus.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/common/SeatStatus.kt
new file mode 100644
index 0000000..6b4e700
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/common/SeatStatus.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.common
+
+data class SeatStatus(
+    val type: SeatStatusType
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/common/SeatStatusType.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/common/SeatStatusType.kt
new file mode 100644
index 0000000..182c281
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/common/SeatStatusType.kt	
@@ -0,0 +1,6 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.common
+
+enum class SeatStatusType {
+    CAN_RESERVATION,
+    CANNOT_RESERVATION
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/CarVehicleServiceAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/CarVehicleServiceAfter.kt
new file mode 100644
index 0000000..6ddb4df
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/CarVehicleServiceAfter.kt	
@@ -0,0 +1,24 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.Vehicle
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleMoveRequest
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleRepository
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleType
+import org.springframework.stereotype.Service
+
+@Service
+class CarVehicleServiceAfter(
+    private val vehicleRepository: VehicleRepository
+): VehicleServiceAfter() {
+    override fun move(request: VehicleMoveRequest): Vehicle {
+        println("자동차가 이동합니다.")
+        val vehicle = vehicleRepository.getVehicle(request.vehicleId)
+        vehicle.positionX = request.positionX
+        vehicle.positionY = request.positionY
+        return vehicle
+    }
+
+    override fun vehicleType(): VehicleType {
+        return VehicleType.CAR
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/PlaneVehicleServiceAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/PlaneVehicleServiceAfter.kt
new file mode 100644
index 0000000..7e698fd
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/PlaneVehicleServiceAfter.kt	
@@ -0,0 +1,24 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.Vehicle
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleMoveRequest
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleRepository
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleType
+import org.springframework.stereotype.Service
+
+@Service
+class PlaneVehicleServiceAfter(
+    private val vehicleRepository: VehicleRepository
+): VehicleServiceAfter() {
+    override fun move(request: VehicleMoveRequest): Vehicle {
+        println("비행기가 이동합니다.")
+        val vehicle = vehicleRepository.getVehicle(request.vehicleId)
+        vehicle.positionX = request.positionX
+        vehicle.positionY = request.positionY
+        return vehicle
+    }
+
+    override fun vehicleType(): VehicleType {
+        return VehicleType.PLANE
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/VehicleControllerAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/VehicleControllerAfter.kt
new file mode 100644
index 0000000..e98146b
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/VehicleControllerAfter.kt	
@@ -0,0 +1,20 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.Vehicle
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleMoveRequest
+import org.springframework.web.bind.annotation.PatchMapping
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/vehicles")
+@RestController
+class VehicleControllerAfter(
+    private val vehicleServiceFactoryAfter: VehicleServiceFactoryAfter
+) {
+    @PatchMapping("/with-lsp")
+    fun move(@RequestBody request: VehicleMoveRequest): Vehicle {
+        val vehicleServiceAfter = vehicleServiceFactoryAfter.getVehicleServiceAfter(request.vehicleType)
+        return vehicleServiceAfter.move(request)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/VehicleServiceAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/VehicleServiceAfter.kt
new file mode 100644
index 0000000..e3c4884
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/VehicleServiceAfter.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.Vehicle
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleMoveRequest
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleType
+
+abstract class VehicleServiceAfter {
+    abstract fun move(request: VehicleMoveRequest): Vehicle
+
+    abstract fun vehicleType(): VehicleType
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/VehicleServiceFactoryAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/VehicleServiceFactoryAfter.kt
new file mode 100644
index 0000000..4c0f3fb
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/after/VehicleServiceFactoryAfter.kt	
@@ -0,0 +1,14 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleType
+import org.springframework.stereotype.Component
+
+@Component
+class VehicleServiceFactoryAfter(
+    val vehicleServiceAfters: List<VehicleServiceAfter>
+) {
+    fun getVehicleServiceAfter(vehicleType: VehicleType): VehicleServiceAfter {
+        return vehicleServiceAfters.find { it.vehicleType() == vehicleType }
+            ?: throw NoSuchElementException("해당 이동수단에 대한 구현이 존재하지 않습니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/CarVehicleServiceBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/CarVehicleServiceBefore.kt
new file mode 100644
index 0000000..1711e64
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/CarVehicleServiceBefore.kt	
@@ -0,0 +1,23 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.Vehicle
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleMoveRequest
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleRepository
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleType
+import org.springframework.stereotype.Service
+
+@Service
+class CarVehicleServiceBefore(
+    private val vehicleRepository: VehicleRepository
+) : VehicleServiceBefore(vehicleRepository) {
+    override fun move(request: VehicleMoveRequest): Vehicle {
+        val vehicle = vehicleRepository.getVehicle(request.vehicleId)
+        vehicle.positionX += request.positionX // 하위 타입에서의 잘못된 오버라이딩!
+        vehicle.positionY += request.positionY // 하위 타입에서의 잘못된 오버라이딩!
+        return vehicle
+    }
+
+    override fun vehicleType(): VehicleType {
+        return VehicleType.CAR
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/PlaneVehicleServiceBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/PlaneVehicleServiceBefore.kt
new file mode 100644
index 0000000..bcdf024
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/PlaneVehicleServiceBefore.kt	
@@ -0,0 +1,23 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.Vehicle
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleMoveRequest
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleRepository
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleType
+import org.springframework.stereotype.Service
+
+@Service
+class PlaneVehicleServiceBefore(
+    private val vehicleRepository: VehicleRepository
+) : VehicleServiceBefore(vehicleRepository) {
+    override fun move(request: VehicleMoveRequest): Vehicle {
+        val vehicle = vehicleRepository.getVehicle(request.vehicleId)
+        vehicle.positionX -= request.positionX // 하위 타입에서의 잘못된 오버라이딩!
+        vehicle.positionY -= request.positionY // 하위 타입에서의 잘못된 오버라이딩!
+        return vehicle
+    }
+
+    override fun vehicleType(): VehicleType {
+        return VehicleType.PLANE
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/VehicleControllerBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/VehicleControllerBefore.kt
new file mode 100644
index 0000000..61edd7b
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/VehicleControllerBefore.kt	
@@ -0,0 +1,20 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.Vehicle
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleMoveRequest
+import org.springframework.web.bind.annotation.PatchMapping
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/vehicles")
+@RestController
+class VehicleControllerBefore(
+    private val vehicleServiceFactoryBefore: VehicleServiceFactoryBefore
+) {
+    @PatchMapping("/none-lsp")
+    fun move(@RequestBody request: VehicleMoveRequest): Vehicle {
+        val vehicleServiceBefore = vehicleServiceFactoryBefore.getVehicleServiceBefore(request.vehicleType)
+        return vehicleServiceBefore.move(request)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/VehicleServiceBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/VehicleServiceBefore.kt
new file mode 100644
index 0000000..8f9996c
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/VehicleServiceBefore.kt	
@@ -0,0 +1,19 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.Vehicle
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleMoveRequest
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleRepository
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleType
+
+abstract class VehicleServiceBefore(
+    private val vehicleRepository: VehicleRepository
+) {
+    open fun move(request: VehicleMoveRequest): Vehicle {
+        val vehicle = vehicleRepository.getVehicle(request.vehicleId)
+        vehicle.positionX = request.positionX
+        vehicle.positionY = request.positionY
+        return vehicle
+    }
+
+    abstract fun vehicleType(): VehicleType
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/VehicleServiceFactoryBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/VehicleServiceFactoryBefore.kt
new file mode 100644
index 0000000..eaf8bde
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/before/VehicleServiceFactoryBefore.kt	
@@ -0,0 +1,14 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.lsp.common.VehicleType
+import org.springframework.stereotype.Component
+
+@Component
+class VehicleServiceFactoryBefore(
+    val vehicleServiceBefores: List<VehicleServiceBefore>
+) {
+    fun getVehicleServiceBefore(vehicleType: VehicleType): VehicleServiceBefore {
+        return vehicleServiceBefores.find { it.vehicleType() == vehicleType }
+            ?: throw NoSuchElementException("해당 이동수단에 대한 구현이 존재하지 않습니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/Vehicle.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/Vehicle.kt
new file mode 100644
index 0000000..4690a09
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/Vehicle.kt	
@@ -0,0 +1,12 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.common
+
+import javax.persistence.Entity
+import javax.persistence.Id
+
+@Entity
+class Vehicle(
+    var positionX: Int = 0,
+    var positionY: Int = 0,
+    @Id
+    val id: Long = 0L
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/VehicleMoveRequest.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/VehicleMoveRequest.kt
new file mode 100644
index 0000000..227035d
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/VehicleMoveRequest.kt	
@@ -0,0 +1,8 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.common
+
+data class VehicleMoveRequest(
+    val vehicleId: Long,
+    val positionX: Int,
+    val positionY: Int,
+    val vehicleType: VehicleType
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/VehicleRepository.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/VehicleRepository.kt
new file mode 100644
index 0000000..19a822d
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/VehicleRepository.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.common
+
+interface VehicleRepository {
+    fun getVehicle(vehicleId: Long): Vehicle
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/VehicleRepositoryStub.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/VehicleRepositoryStub.kt
new file mode 100644
index 0000000..63ae256
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/VehicleRepositoryStub.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.common
+
+import org.springframework.stereotype.Repository
+
+@Repository
+class VehicleRepositoryStub : VehicleRepository {
+    override fun getVehicle(vehicleId: Long): Vehicle {
+        return Vehicle(id = vehicleId)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/VehicleType.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/VehicleType.kt
new file mode 100644
index 0000000..b8e2bb0
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/lsp/common/VehicleType.kt	
@@ -0,0 +1,6 @@
+package com.banjjoknim.soliddesignpatternsample.solid.lsp.common
+
+enum class VehicleType {
+    CAR,
+    PLANE
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/CardPaymentService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/CardPaymentService.kt
new file mode 100644
index 0000000..e577e5f
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/CardPaymentService.kt	
@@ -0,0 +1,20 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.Payment
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.PaymentRepository
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.PaymentType
+import org.springframework.stereotype.Repository
+
+@Repository
+class CardPaymentService(
+    private val paymentRepository: PaymentRepository
+): PaymentServiceAfter {
+    override fun pay(request: PaymentRequestAfter): Payment {
+        println("카드 결제로 ${request.amount}원을 차감합니다.")
+        return paymentRepository.createPayment(request.amount, request.paymentType)
+    }
+
+    override fun getPaymentType(): PaymentType {
+        return PaymentType.CARD
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/CashPaymentService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/CashPaymentService.kt
new file mode 100644
index 0000000..effc56b
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/CashPaymentService.kt	
@@ -0,0 +1,20 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.Payment
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.PaymentRepository
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.PaymentType
+import org.springframework.stereotype.Repository
+
+@Repository
+class CashPaymentService(
+    private val paymentRepository: PaymentRepository
+): PaymentServiceAfter {
+    override fun pay(request: PaymentRequestAfter): Payment {
+        println("현금드 결제로 ${request.amount}원을 차감합니다.")
+        return paymentRepository.createPayment(request.amount, request.paymentType)
+    }
+
+    override fun getPaymentType(): PaymentType {
+        return PaymentType.CASH
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/CouponPaymentService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/CouponPaymentService.kt
new file mode 100644
index 0000000..b4c8cc3
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/CouponPaymentService.kt	
@@ -0,0 +1,20 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.Payment
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.PaymentRepository
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.PaymentType
+import org.springframework.stereotype.Repository
+
+@Repository
+class CouponPaymentService(
+    private val paymentRepository: PaymentRepository
+): PaymentServiceAfter {
+    override fun pay(request: PaymentRequestAfter): Payment {
+        println("쿠폰 결제는 잔고 차감이 없습니다.")
+        return paymentRepository.createPayment(request.amount, request.paymentType)
+    }
+
+    override fun getPaymentType(): PaymentType {
+        return PaymentType.COUPON
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/PaymentController.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/PaymentController.kt
new file mode 100644
index 0000000..0b58d51
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/PaymentController.kt	
@@ -0,0 +1,18 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.Payment
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/payments")
+@RestController
+class PaymentController(
+    private val paymentServiceFactory: PaymentServiceFactory
+) {
+    @PostMapping("with-ocp")
+    fun pay(request: PaymentRequestAfter): Payment {
+        val paymentService = paymentServiceFactory.getPaymentService(request.paymentType)
+        return paymentService.pay(request)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/PaymentRequestAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/PaymentRequestAfter.kt
new file mode 100644
index 0000000..2dd7a27
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/PaymentRequestAfter.kt	
@@ -0,0 +1,8 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.PaymentType
+
+data class PaymentRequestAfter(
+    val amount: Int,
+    val paymentType: PaymentType
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/PaymentServiceAfter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/PaymentServiceAfter.kt
new file mode 100644
index 0000000..a5e8956
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/PaymentServiceAfter.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.Payment
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.PaymentType
+
+interface PaymentServiceAfter {
+    fun pay(request: PaymentRequestAfter): Payment
+
+    fun getPaymentType(): PaymentType
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/PaymentServiceFactory.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/PaymentServiceFactory.kt
new file mode 100644
index 0000000..152fcf2
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/after/PaymentServiceFactory.kt	
@@ -0,0 +1,27 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.PaymentType
+import org.springframework.stereotype.Component
+
+@Component
+class PaymentServiceFactory(val paymentServices: List<PaymentServiceAfter>) {
+    fun getPaymentService(paymentType: PaymentType): PaymentServiceAfter {
+        return this.paymentServices.find { it.getPaymentType() == paymentType }
+            ?: throw NoSuchElementException("해당 결제방식에 대한 구현이 존재하지 않습니다.")
+    }
+}
+
+//@Component
+//class PaymentServiceFactory(
+//    private val cashPaymentService: CashPaymentService,
+//    private val cardPaymentService: CardPaymentService,
+//    private val couponPaymentService: CouponPaymentService
+//) {
+//    fun findPaymentService(paymentType: PaymentType): PaymentServiceAfter {
+//        return when (paymentType) {
+//            PaymentType.CASH -> cashPaymentService
+//            PaymentType.CARD -> cardPaymentService
+//            PaymentType.COUPON -> couponPaymentService
+//        }
+//    }
+//}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/before/PaymentControllerBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/before/PaymentControllerBefore.kt
new file mode 100644
index 0000000..0bd196a
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/before/PaymentControllerBefore.kt	
@@ -0,0 +1,18 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.Payment
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/payments")
+@RestController
+class PaymentControllerBefore(
+    private val paymentServiceBefore: PaymentServiceBefore
+) {
+    @PostMapping("/none-ocp")
+    fun pay(@RequestBody request: PaymentRequestBefore): Payment {
+        return paymentServiceBefore.pay(request)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/before/PaymentRequestBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/before/PaymentRequestBefore.kt
new file mode 100644
index 0000000..b62464a
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/before/PaymentRequestBefore.kt	
@@ -0,0 +1,8 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.PaymentType
+
+data class PaymentRequestBefore(
+    val amount: Int,
+    val type: PaymentType
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/before/PaymentServiceBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/before/PaymentServiceBefore.kt
new file mode 100644
index 0000000..3472f93
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/before/PaymentServiceBefore.kt	
@@ -0,0 +1,21 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.Payment
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.PaymentRepository
+import com.banjjoknim.soliddesignpatternsample.solid.ocp.common.PaymentType
+import org.springframework.stereotype.Service
+
+@Service
+class PaymentServiceBefore(
+    private val paymentRepository: PaymentRepository
+) {
+    fun pay(request: PaymentRequestBefore): Payment {
+        when (request.type) {
+            PaymentType.CASH -> println("현금 결제로 ${request.amount}원을 차감합니다.")
+            PaymentType.CARD -> println("카드 결제로 ${request.amount}원을 차감합니다.")
+            PaymentType.COUPON -> println("쿠폰 결제는 잔고 차감이 없습니다.")
+            // NewPaymentType -> ...
+        }
+        return paymentRepository.createPayment(request.amount, request.type)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/common/Payment.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/common/Payment.kt
new file mode 100644
index 0000000..09451bb
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/common/Payment.kt	
@@ -0,0 +1,12 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.common
+
+import javax.persistence.Entity
+import javax.persistence.Id
+
+@Entity
+class Payment(
+    val amount: Int,
+    val type: PaymentType,
+    @Id
+    val id: Long = 0L
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/common/PaymentRepository.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/common/PaymentRepository.kt
new file mode 100644
index 0000000..b6fa1f9
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/common/PaymentRepository.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.common
+
+interface PaymentRepository {
+    fun createPayment(amount: Int, paymentType: PaymentType): Payment
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/common/PaymentRepositoryStub.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/common/PaymentRepositoryStub.kt
new file mode 100644
index 0000000..495f124
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/common/PaymentRepositoryStub.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.common
+
+import org.springframework.stereotype.Repository
+
+@Repository
+class PaymentRepositoryStub : PaymentRepository {
+    override fun createPayment(amount: Int, paymentType: PaymentType): Payment {
+        return Payment(amount = amount, type = paymentType)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/common/PaymentType.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/common/PaymentType.kt
new file mode 100644
index 0000000..59bdf10
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/ocp/common/PaymentType.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.solid.ocp.common
+
+enum class PaymentType {
+    CASH,
+    CARD,
+    COUPON
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/CreateAccountController.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/CreateAccountController.kt
new file mode 100644
index 0000000..f20011e
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/CreateAccountController.kt	
@@ -0,0 +1,18 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.srp.common.Account
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/accounts")
+@RestController
+class CreateAccountController(
+    private val createAccountService: CreateAccountService
+) {
+    @PostMapping("")
+    fun createAccount(@RequestBody request: CreateAccountRequest): Account {
+        return createAccountService.createAccount(request)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/CreateAccountRequest.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/CreateAccountRequest.kt
new file mode 100644
index 0000000..1ba5648
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/CreateAccountRequest.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.after
+
+data class CreateAccountRequest(
+    val holderName: String
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/CreateAccountService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/CreateAccountService.kt
new file mode 100644
index 0000000..3347817
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/CreateAccountService.kt	
@@ -0,0 +1,14 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.srp.common.Account
+import com.banjjoknim.soliddesignpatternsample.solid.srp.common.AccountRepository
+import org.springframework.stereotype.Service
+
+@Service
+class CreateAccountService(
+    private val accountRepository: AccountRepository
+) {
+    fun createAccount(request: CreateAccountRequest): Account {
+        return accountRepository.createAccount(request.holderName)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/DepositAccountController.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/DepositAccountController.kt
new file mode 100644
index 0000000..d9ec50a
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/DepositAccountController.kt	
@@ -0,0 +1,18 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.srp.common.Account
+import org.springframework.web.bind.annotation.PatchMapping
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/accounts")
+@RestController
+class DepositAccountController(
+    private val depositAccountService: DepositAccountService
+) {
+    @PatchMapping("/deposit")
+    fun depositAccount(@RequestBody request: DepositAccountRequest): Account {
+        return depositAccountService.depositAccount(request)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/DepositAccountRequest.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/DepositAccountRequest.kt
new file mode 100644
index 0000000..cbe5060
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/DepositAccountRequest.kt	
@@ -0,0 +1,6 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.after
+
+data class DepositAccountRequest(
+    val accountId: Long,
+    val amount: Int
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/DepositAccountService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/DepositAccountService.kt
new file mode 100644
index 0000000..0516286
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/DepositAccountService.kt	
@@ -0,0 +1,16 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.srp.common.Account
+import com.banjjoknim.soliddesignpatternsample.solid.srp.common.AccountRepository
+import org.springframework.stereotype.Service
+
+@Service
+class DepositAccountService(
+    private val accountRepository: AccountRepository
+) {
+    fun depositAccount(request: DepositAccountRequest): Account {
+        val account = accountRepository.findAccount(request.accountId)
+        account.deposit(request.amount)
+        return account
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/WithdrawalAccountController.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/WithdrawalAccountController.kt
new file mode 100644
index 0000000..f65b2d5
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/WithdrawalAccountController.kt	
@@ -0,0 +1,18 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.srp.common.Account
+import org.springframework.web.bind.annotation.PatchMapping
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/accounts")
+@RestController
+class WithdrawalAccountController(
+    private val withdrawalAccountService: WithdrawalAccountService
+) {
+    @PatchMapping("/withdrawal")
+    fun withdrawal(@RequestBody request: WithdrawalAccountRequest): Account {
+        return withdrawalAccountService.withdrawalAccount(request)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/WithdrawalAccountRequest.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/WithdrawalAccountRequest.kt
new file mode 100644
index 0000000..d4aa847
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/WithdrawalAccountRequest.kt	
@@ -0,0 +1,6 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.after
+
+data class WithdrawalAccountRequest(
+    val accountId: Long,
+    val amount: Int
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/WithdrawalAccountService.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/WithdrawalAccountService.kt
new file mode 100644
index 0000000..09f106e
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/after/WithdrawalAccountService.kt	
@@ -0,0 +1,16 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.srp.common.Account
+import com.banjjoknim.soliddesignpatternsample.solid.srp.common.AccountRepository
+import org.springframework.stereotype.Service
+
+@Service
+class WithdrawalAccountService(
+    private val accountRepository: AccountRepository
+) {
+    fun withdrawalAccount(request: WithdrawalAccountRequest): Account {
+        val account = accountRepository.findAccount(request.accountId)
+        account.withdrawal(request.amount)
+        return account
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/before/AccountControllerBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/before/AccountControllerBefore.kt
new file mode 100644
index 0000000..563d6db
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/before/AccountControllerBefore.kt	
@@ -0,0 +1,18 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.srp.common.Account
+import org.springframework.web.bind.annotation.PatchMapping
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/accounts")
+@RestController
+class AccountControllerBefore(
+    private val accountServiceBefore: AccountServiceBefore
+) {
+    @PatchMapping("/manage-account-before")
+    fun manageAccount(@RequestBody request: ManageAccountRequest): Account {
+        return accountServiceBefore.manageAccount(request)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/before/AccountServiceBefore.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/before/AccountServiceBefore.kt
new file mode 100644
index 0000000..a314e83
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/before/AccountServiceBefore.kt	
@@ -0,0 +1,28 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.srp.common.Account
+import com.banjjoknim.soliddesignpatternsample.solid.srp.common.AccountRepository
+import org.springframework.stereotype.Service
+
+@Service
+class AccountServiceBefore(
+    private val accountRepository: AccountRepository
+) {
+    fun manageAccount(request: ManageAccountRequest): Account {
+        return when (request.type) {
+            ManageAccountType.CREATE -> {
+                accountRepository.createAccount(request.holderName)
+            }
+            ManageAccountType.DEPOSIT -> {
+                val account = accountRepository.findAccount(request.accountId)
+                account.deposit(request.amount)
+                account
+            }
+            ManageAccountType.WITHDRAWAL -> {
+                val account = accountRepository.findAccount(request.accountId)
+                account.withdrawal(request.amount)
+                account
+            }
+        }
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/before/ManageAccountRequest.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/before/ManageAccountRequest.kt
new file mode 100644
index 0000000..1df3022
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/before/ManageAccountRequest.kt	
@@ -0,0 +1,8 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.before
+
+data class ManageAccountRequest(
+    val accountId: Long,
+    val holderName: String,
+    val amount: Int,
+    val type: ManageAccountType
+)
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/before/ManageAccountType.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/before/ManageAccountType.kt
new file mode 100644
index 0000000..f96e605
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/before/ManageAccountType.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.before
+
+enum class ManageAccountType {
+    CREATE, // 생성
+    DEPOSIT, // 입금
+    WITHDRAWAL // 출금
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/common/Account.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/common/Account.kt
new file mode 100644
index 0000000..d650ecd
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/common/Account.kt	
@@ -0,0 +1,20 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.common
+
+import javax.persistence.Entity
+import javax.persistence.Id
+
+@Entity
+class Account(
+    val holderName: String = "",
+    var balance: Int = 0,
+    @Id
+    val id: Long = 0,
+) {
+    fun deposit(amount: Int) {
+        this.balance = this.balance + amount
+    }
+
+    fun withdrawal(amount: Int) {
+        this.balance = this.balance - amount
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/common/AccountRepository.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/common/AccountRepository.kt
new file mode 100644
index 0000000..aa0e27e
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/common/AccountRepository.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.common
+
+interface AccountRepository {
+    fun createAccount(holderName: String): Account
+
+    fun findAccount(accountId: Long): Account
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/common/AccountRepositoryStub.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/common/AccountRepositoryStub.kt
new file mode 100644
index 0000000..54dfdb2
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/srp/common/AccountRepositoryStub.kt	
@@ -0,0 +1,14 @@
+package com.banjjoknim.soliddesignpatternsample.solid.srp.common
+
+import org.springframework.stereotype.Repository
+
+@Repository
+class AccountRepositoryStub : AccountRepository {
+    override fun createAccount(holderName: String): Account {
+        return Account(holderName = "banjjoknim", balance = 0)
+    }
+
+    override fun findAccount(accountId: Long): Account {
+        return Account(id = 1L, balance = 10000)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/resources/application.properties b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/resources/application.properties
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/resources/application.properties	
@@ -0,0 +1 @@
+
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/test/kotlin/com/banjjoknim/soliddesignpatternsample/SolidDesignPatternSampleApplicationTests.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/test/kotlin/com/banjjoknim/soliddesignpatternsample/SolidDesignPatternSampleApplicationTests.kt
new file mode 100644
index 0000000..3937125
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/test/kotlin/com/banjjoknim/soliddesignpatternsample/SolidDesignPatternSampleApplicationTests.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample
+
+import org.junit.jupiter.api.Test
+import org.springframework.boot.test.context.SpringBootTest
+
+@SpringBootTest
+class SolidDesignPatternSampleApplicationTests {
+
+	@Test
+	fun contextLoads() {
+	}
+
+}