Java设计模式（二十二）中介者模式（Mediator）

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介绍

中介者模式也是用来降低类类之间的耦合的，因为如果类类之间有依赖关系的话，不利于功能的拓展和维护，因为只要修改一个对象，其它关联的对象都得进行修改。如果使用中介者模式，只需关心和Mediator类的关系，具体类类之间的关系及调度交给Mediator就行，这有点像spring容器的作用

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public interface Mediator {  
    public void createMediator();  
    public void workAll();  
}

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public class MyMediator implements Mediator {  
  
    private User user1;  
    private User user2;  
      
    public User getUser1() {  
        return user1;  
    }  
  
    public User getUser2() {  
        return user2;  
    }  
  
    @Override  
    public void createMediator() {  
        user1 = new User1(this);  
        user2 = new User2(this);  
    }  
  
    @Override  
    public void workAll() {  
        user1.work();  
        user2.work();  
    }  
}
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public abstract class User {  
      
    private Mediator mediator;  
      
    public Mediator getMediator(){  
        return mediator;  
    }  
      
    public User(Mediator mediator) {  
        this.mediator = mediator;  
    }  
  
    public abstract void work();  
}
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public class User1 extends User {  
  
    public User1(Mediator mediator){  
        super(mediator);  
    }  
      
    @Override  
    public void work() {  
        System.out.println("user1 exe!");  
    }  
}
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public class User2 extends User {  
  
    public User2(Mediator mediator){  
        super(mediator);  
    }  
      
    @Override  
    public void work() {  
        System.out.println("user2 exe!");  
    }  
}  
//测试类：
public class Test {  
  
    public static void main(String[] args) {  
        Mediator mediator = new MyMediator();  
        mediator.createMediator();  
        mediator.workAll();  
    }  
}