1 package com.lcw.adapter.test;
2
3 public interface ThreeSocket {
4
5     //需要一个三孔插座，也就是客戶的需求
6     public void needThreeSocket();
7
8 }

1 package com.lcw.adapter.test;
2
3 public class TwoSocket {
4     // 现有的插座，只有二孔,已经有了供电功能，只是缺少了三孔接口
5     public void serverTwo() {
6         System.out.println("我是一个二孔插座,我有供电功能");
7     }
8
9 }

 1 package com.lcw.adapter.test;
 2
 3 public class ThreeToTwoAdapter implements ThreeSocket{
 4     private TwoSocket socket;
 5     public ThreeToTwoAdapter(TwoSocket two) {
 6         this.socket=two;
 7     }
 8     //现在已经有2孔插座的对象（意味着有通电功能）
 9     @Override
10     public void needThreeSocket() {
11         socket.serverTwo();
12         System.out.println("二孔接口已转换成三孔接口,并注入电");
13     }
14
15 }

 1 package com.lcw.adapter.test;
 2
 3 public class Computer {
 4     //笔记本电脑的电源插头需求是3孔
 5     private ThreeSocket three;
 6     public Computer(ThreeSocket three){
 7         this.three=three;
 8     }
 9     public void server(){
10         System.out.println("笔记本通电成功！");
11     }
12
13 }

 1 package com.lcw.adapter.test;
 2
 3 public class Test {
 4     public static void main(String[] args) {
 5         //现有插座两孔,已经有提供电的功能,只是缺少3孔接口
 6         TwoSocket two=new TwoSocket();
 7         //把具有通电功能的对象传递进去，目的是要开通3孔接口的通电功能
 8         ThreeSocket three=new ThreeToTwoAdapter(two);
 9         //得到一个满足笔记本电源接口且具有电的功能对象
10         Computer computer=new Computer(three);
11         three.needThreeSocket();
12         computer.server();
13     }
14 }

1 package com.lcw.adapter.test;
2
3 public class ThreeToTwoExtendsAdapter extends TwoSocket implements ThreeSocket{
4     public void needThreeSocket() {
5         this.serverTwo();
6         System.out.println("二孔接口已转换成三孔接口");
7     }
8
9 }

 1 package com.lcw.adapter.test;
 2
 3 public class Test {
 4     public static void main(String[] args) {
 5         //由于ThreeToTwoExtendsAdapter继承了源，所以具有源的功能(电),并实现了3孔接口
 6         ThreeSocket socket=new ThreeToTwoExtendsAdapter();
 7         //插入接口
 8         Computer computer=new Computer(socket);
 9         socket.needThreeSocket();
10         computer.server();
11
12     }
13 }