From 39a39bdbded168332ff24f75c3a51395814f63af Mon Sep 17 00:00:00 2001
From: kim <haerong22@naver.com>
Date: Thu, 7 Jan 2021 15:34:50 +0900
Subject: [PATCH] Strategy Pattern

---
 codingtest/src/Test.java                      | 27 -----------------
 design-pattern/src/Strategy/AObj.java         | 14 +++++++++
 design-pattern/src/Strategy/Ainterface.java   |  7 +++++
 .../src/Strategy/AinterfaceImpl.java          |  8 +++++
 design-pattern/src/Strategy/Ax.java           |  8 +++++
 .../src/Strategy/GameCharacter.java           | 20 +++++++++++++
 design-pattern/src/Strategy/Gun.java          |  8 +++++
 design-pattern/src/Strategy/Main.java         | 23 ++++++++++++++
 design-pattern/src/Strategy/Strategy          | 30 +++++++++++++++++++
 design-pattern/src/Strategy/Sword.java        |  8 +++++
 design-pattern/src/Strategy/Weapon.java       |  6 ++++
 11 files changed, 132 insertions(+), 27 deletions(-)
 delete mode 100644 codingtest/src/Test.java
 create mode 100644 design-pattern/src/Strategy/AObj.java
 create mode 100644 design-pattern/src/Strategy/Ainterface.java
 create mode 100644 design-pattern/src/Strategy/AinterfaceImpl.java
 create mode 100644 design-pattern/src/Strategy/Ax.java
 create mode 100644 design-pattern/src/Strategy/GameCharacter.java
 create mode 100644 design-pattern/src/Strategy/Gun.java
 create mode 100644 design-pattern/src/Strategy/Main.java
 create mode 100644 design-pattern/src/Strategy/Strategy
 create mode 100644 design-pattern/src/Strategy/Sword.java
 create mode 100644 design-pattern/src/Strategy/Weapon.java

diff --git a/codingtest/src/Test.java b/codingtest/src/Test.java
deleted file mode 100644
index 18f3914d..00000000
--- a/codingtest/src/Test.java
+++ /dev/null
@@ -1,27 +0,0 @@
-
-
-public class Test {
-
-    public static void main(String[] args) {
-        System.out.println(solution("ABABAAAAABA"));
-    }
-
-    public static int solution(String name) {
-        int len = name.length();
-        int move = len-1;
-        int answer = 0 ;
-
-        for(int i=0; i<len; ++i) {
-            answer += Math.min(name.charAt(i) - 'A', 91 - name.charAt(i));
-
-            int next = i+1;
-            while(next<len && name.charAt(next)=='A') {
-                ++next;
-            }
-            move = Math.min(move,i+len-next+Math.min(i,len-next));
-        }
-        answer += move;
-
-        return answer;
-    }
-}
diff --git a/design-pattern/src/Strategy/AObj.java b/design-pattern/src/Strategy/AObj.java
new file mode 100644
index 00000000..683cc6c4
--- /dev/null
+++ b/design-pattern/src/Strategy/AObj.java
@@ -0,0 +1,14 @@
+package Strategy;
+
+public class AObj {
+    Ainterface ainterface;
+
+    public AObj() {
+        ainterface = new AinterfaceImpl();
+    }
+
+    public void funcAA() {
+        ainterface.funcA();
+        ainterface.funcA();
+    }
+}
diff --git a/design-pattern/src/Strategy/Ainterface.java b/design-pattern/src/Strategy/Ainterface.java
new file mode 100644
index 00000000..5d67e598
--- /dev/null
+++ b/design-pattern/src/Strategy/Ainterface.java
@@ -0,0 +1,7 @@
+package Strategy;
+
+public interface Ainterface {
+
+    // 기능 선언
+    void funcA();
+}
diff --git a/design-pattern/src/Strategy/AinterfaceImpl.java b/design-pattern/src/Strategy/AinterfaceImpl.java
new file mode 100644
index 00000000..d6a992b8
--- /dev/null
+++ b/design-pattern/src/Strategy/AinterfaceImpl.java
@@ -0,0 +1,8 @@
+package Strategy;
+
+public class AinterfaceImpl implements Ainterface{
+    @Override
+    public void funcA() {
+        System.out.println("A function");
+    }
+}
diff --git a/design-pattern/src/Strategy/Ax.java b/design-pattern/src/Strategy/Ax.java
new file mode 100644
index 00000000..4aeea191
--- /dev/null
+++ b/design-pattern/src/Strategy/Ax.java
@@ -0,0 +1,8 @@
+package Strategy;
+
+public class Ax implements Weapon {
+    @Override
+    public void attack() {
+        System.out.println("도끼 공격 훙훙");
+    }
+}
diff --git a/design-pattern/src/Strategy/GameCharacter.java b/design-pattern/src/Strategy/GameCharacter.java
new file mode 100644
index 00000000..dbcf805f
--- /dev/null
+++ b/design-pattern/src/Strategy/GameCharacter.java
@@ -0,0 +1,20 @@
+package Strategy;
+
+public class GameCharacter {
+    // 접근점
+    private Weapon weapon;
+
+    // 교환 가능
+    public void setWeapon(Weapon weapon) {
+        this.weapon = weapon;
+    }
+
+    public void attack() {
+        // 델리게이트
+        if (weapon == null ) {
+            System.out.println("맨손공격 퍽퍽");
+        } else {
+            weapon.attack();
+        }
+    }
+}
diff --git a/design-pattern/src/Strategy/Gun.java b/design-pattern/src/Strategy/Gun.java
new file mode 100644
index 00000000..dbf0673d
--- /dev/null
+++ b/design-pattern/src/Strategy/Gun.java
@@ -0,0 +1,8 @@
+package Strategy;
+
+public class Gun implements Weapon {
+    @Override
+    public void attack() {
+        System.out.println("총 쏘기 빵야빵야");
+    }
+}
diff --git a/design-pattern/src/Strategy/Main.java b/design-pattern/src/Strategy/Main.java
new file mode 100644
index 00000000..860c1d8e
--- /dev/null
+++ b/design-pattern/src/Strategy/Main.java
@@ -0,0 +1,23 @@
+package Strategy;
+
+public class Main {
+    public static void main(String[] args) {
+//        Ainterface ainterface = new AinterfaceImpl();
+//        ainterface.funcA();
+//
+//        AObj aObj = new AObj();
+//        aObj.funcAA();
+        GameCharacter gameCharacter = new GameCharacter();
+
+        gameCharacter.attack();
+
+        gameCharacter.setWeapon(new Gun());
+        gameCharacter.attack();
+
+        gameCharacter.setWeapon(new Sword());
+        gameCharacter.attack();
+
+        gameCharacter.setWeapon(new Ax());
+        gameCharacter.attack();
+    }
+}
diff --git a/design-pattern/src/Strategy/Strategy b/design-pattern/src/Strategy/Strategy
new file mode 100644
index 00000000..14f7319e
--- /dev/null
+++ b/design-pattern/src/Strategy/Strategy
@@ -0,0 +1,30 @@
+인터페이스
+ - 기능에 대한 선언과 구현 분리
+    Ainterface : 선언 , AinterfaceImpl : 구현
+
+ - 기능을 사용할 수 있는 통로
+    Ainterface 타입으로 AimterfaceImple 객체를 생성 및 메소드 사용
+
+델리게이트
+ - 위임하다
+    AObj 에서 funcAA를 사용하기위해 AinterfaceImpl 객체를 호출, 메소드 사용
+ - 어떤 객체가 어떤 기능을 수행할 때 그 객체 이외의 다른 객체의 기능을 사용 
+
+Strategy pattern
+ - 여러 알고리즘을 하나의 추상적인 접근점을 만들어 접근 점에서 서로 교환 가능하도록 하는 패턴
+
+요구사항
+ - 신작 게임에서 케릭터의 무기를 구현
+ - 무기 종류는 총, 검 두가지
+
+ -> Weapon interface 생성
+ -> Weapon을 상속 받는 Gun, Sword 클래스 생성
+ -> GameCharacter 클래스에서 attack 메소드를 사용하기 위해
+    Weapon 객체를 호출 하여 사용( attack 메소드 직접 구현 X )
+ -> Main 클래스에서 GameCharacter 객체를 생성하고 사용
+
+추가사항
+ - 무기 도끼 추가
+
+ -> 다른 코드들을 변경할 필요 없이
+    Weapon을 상속받은 Ax클래스만 추가하여 사용가능 해진다.
\ No newline at end of file
diff --git a/design-pattern/src/Strategy/Sword.java b/design-pattern/src/Strategy/Sword.java
new file mode 100644
index 00000000..0d277bdc
--- /dev/null
+++ b/design-pattern/src/Strategy/Sword.java
@@ -0,0 +1,8 @@
+package Strategy;
+
+public class Sword implements Weapon {
+    @Override
+    public void attack() {
+        System.out.println("검 공격 서걱서걱");
+    }
+}
diff --git a/design-pattern/src/Strategy/Weapon.java b/design-pattern/src/Strategy/Weapon.java
new file mode 100644
index 00000000..6061489d
--- /dev/null
+++ b/design-pattern/src/Strategy/Weapon.java
@@ -0,0 +1,6 @@
+package Strategy;
+
+public interface Weapon {
+
+    void attack();
+}