Java 代理

1 public interface Subject   
2 {   
3   public void doSomething();   
4 }

1 public class RealSubject implements Subject   
2 {   
3   public void doSomething()   
4   {   
5     System.out.println( "call doSomething()" );   
6   }   
7 }  

1 public class SubjectProxy implements Subject
2 {
3   Subject subimpl = new RealSubject();
4   public void doSomething()
5   {
6      subimpl.doSomething();
7   }
8 }

1 public class TestProxy 
2 {
3    public static void main(String args[])
4    {
5        Subject sub = new SubjectProxy();
6        sub.doSomething();
7    }
8 }