1、源接口

1 package Proxy;2 3 public interface Sourceable {4     public void method();5 6 }

2、实现类

1 package Proxy; 2  3 public class Source implements Sourceable{ 4  5     @Override 6     public void method() { 7          System.out.println("接口实现类中原始方法。");  8          9     }10 11 }

3、代理类

1 package Proxy; 2  3 public class Proxy implements Sourceable{ 4     private Source source; 5     public Proxy(){ 6         super(); 7         //被代理类 8         this.source = new Source(); 9     }10     @Override11     public void method() {12         // TODO Auto-generated method stub13         before();14         source.method(); //在原始方法前后再扩展方法15         after();16         17     }18     public void after(){19         System.out.println("扩展方法1");20     }21     public void before(){22         System.out.println("扩展方法2");23     }24 25 }

4、客户端

1 package Proxy; 2  3 public class ProxyTest { 4  5     public static void main(String[] args) { 6         // TODO Auto-generated method stub 7         Sourceable source = new Proxy(); 8         source.method(); 9     }10 11 }

 5、结果

扩展方法2接口实现类中原始方法。扩展方法1