From 9b81e125fb7eb6ed77bd49a70cd560fab1ca3364 Mon Sep 17 00:00:00 2001
From: haerong22 <haerong22@naver.com>
Date: Fri, 12 Mar 2021 14:04:12 +0900
Subject: [PATCH] java oop : interface

---
 JavaOOP/src/Java23.java       | 19 +++++++++++++++++++
 JavaOOP/src/Java24.java       | 20 ++++++++++++++++++++
 JavaOOP/src/poly/Animal.java  | 11 +++++++++++
 JavaOOP/src/poly/Cat.java     | 12 ++++++++++++
 JavaOOP/src/poly/Dog.java     |  8 ++++++++
 JavaOOP/src/poly/Radio.java   | 18 ++++++++++++++++++
 JavaOOP/src/poly/RemoCon.java | 13 +++++++++++++
 JavaOOP/src/poly/TV.java      | 18 ++++++++++++++++++
 8 files changed, 119 insertions(+)
 create mode 100644 JavaOOP/src/Java23.java
 create mode 100644 JavaOOP/src/Java24.java
 create mode 100644 JavaOOP/src/poly/Animal.java
 create mode 100644 JavaOOP/src/poly/Cat.java
 create mode 100644 JavaOOP/src/poly/Dog.java
 create mode 100644 JavaOOP/src/poly/Radio.java
 create mode 100644 JavaOOP/src/poly/RemoCon.java
 create mode 100644 JavaOOP/src/poly/TV.java

diff --git a/JavaOOP/src/Java23.java b/JavaOOP/src/Java23.java
new file mode 100644
index 00000000..ee72704c
--- /dev/null
+++ b/JavaOOP/src/Java23.java
@@ -0,0 +1,19 @@
+import poly.Animal;
+import poly.Cat;
+import poly.Dog;
+
+public class Java23 {
+    public static void main(String[] args) {
+        // 추상클래스
+        // Animal animal = new Animal; (X)
+        // upcasting 으로 활용
+        Animal cat = new Cat();
+        Animal dog = new Dog();
+
+        cat.eat();
+        cat.move();
+
+        dog.eat();
+        dog.move();
+    }
+}
diff --git a/JavaOOP/src/Java24.java b/JavaOOP/src/Java24.java
new file mode 100644
index 00000000..3d6cdfa6
--- /dev/null
+++ b/JavaOOP/src/Java24.java
@@ -0,0 +1,20 @@
+import poly.Radio;
+import poly.RemoCon;
+import poly.TV;
+
+public class Java24 {
+    public static void main(String[] args) {
+        // 인터페이스
+        // 객체 생성 X : RemoCon r = new RemoCon(); (X)
+
+        RemoCon r = new TV();
+        r.chUp();
+        r.chDown();
+        r.internet();
+
+        r = new Radio();
+        r.chUp();
+        r.chDown();
+        r.internet();
+    }
+}
diff --git a/JavaOOP/src/poly/Animal.java b/JavaOOP/src/poly/Animal.java
new file mode 100644
index 00000000..5b6017ed
--- /dev/null
+++ b/JavaOOP/src/poly/Animal.java
@@ -0,0 +1,11 @@
+package poly;
+
+// 추상 클래스 -> 불완전 클래스 : 객체 생성 불가  new Animal() (X)
+public abstract class Animal {
+
+    public abstract void eat(); // 추상 메소드 -> 불완전 메소드
+
+    public void move() { // 일반 메소드도 작성 가능
+        System.out.println("이동한다.");
+    }
+}
diff --git a/JavaOOP/src/poly/Cat.java b/JavaOOP/src/poly/Cat.java
new file mode 100644
index 00000000..01bfa43a
--- /dev/null
+++ b/JavaOOP/src/poly/Cat.java
@@ -0,0 +1,12 @@
+package poly;
+
+public class Cat extends Animal {
+    @Override
+    public void eat() {
+        System.out.println("고양이가 먹는다");
+    }
+
+    public void say() {
+        System.out.println("냐옹옹");
+    }
+}
diff --git a/JavaOOP/src/poly/Dog.java b/JavaOOP/src/poly/Dog.java
new file mode 100644
index 00000000..120349ff
--- /dev/null
+++ b/JavaOOP/src/poly/Dog.java
@@ -0,0 +1,8 @@
+package poly;
+
+public class Dog extends Animal {
+    @Override
+    public void eat() {
+        System.out.println("개가 먹는다");
+    }
+}
diff --git a/JavaOOP/src/poly/Radio.java b/JavaOOP/src/poly/Radio.java
new file mode 100644
index 00000000..7a9d0f01
--- /dev/null
+++ b/JavaOOP/src/poly/Radio.java
@@ -0,0 +1,18 @@
+package poly;
+
+public class Radio implements RemoCon{
+    @Override
+    public void chUp() {
+        System.out.println("Radio 채널이 올라간다.");
+    }
+
+    @Override
+    public void chDown() {
+        System.out.println("Radio 채널이 내려간다.");
+    }
+
+    @Override
+    public void internet() {
+        System.out.println("Radio는 인터넷 사용 불가");
+    }
+}
diff --git a/JavaOOP/src/poly/RemoCon.java b/JavaOOP/src/poly/RemoCon.java
new file mode 100644
index 00000000..c50c013c
--- /dev/null
+++ b/JavaOOP/src/poly/RemoCon.java
@@ -0,0 +1,13 @@
+package poly;
+
+public interface RemoCon { // 객체 생성 X : RemoCon r = new RemoCon(); (X)
+
+    // 상수를 사용가능 ( public static final 생략 )
+    int MAXCH = 100;
+    int MINCH = 1;
+
+    // public abstract 생략
+    void chUp();
+    void chDown();
+    void internet();
+}
diff --git a/JavaOOP/src/poly/TV.java b/JavaOOP/src/poly/TV.java
new file mode 100644
index 00000000..a574368b
--- /dev/null
+++ b/JavaOOP/src/poly/TV.java
@@ -0,0 +1,18 @@
+package poly;
+
+public class TV implements RemoCon{
+    @Override
+    public void chUp() {
+        System.out.println("TV의 채널이 올라간다.");
+    }
+
+    @Override
+    public void chDown() {
+        System.out.println("TV의 채널이 내려간다.");
+    }
+
+    @Override
+    public void internet() {
+        System.out.println("TV는 인터넷 사용 가능");
+    }
+}