路一步步走>> 设计模式十七：Mediator-中介者

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package com.test.DPs.XingWei.Mediator;
/**
 * 行为型：Mediator-中介者		外观：作用面为 对象
 * 
 * 用途：用一个中介对象来封装一系列的对象交互。
 *     中介者使个对象不需要显示的相互引用，从而使其耦合松散，而且可独立改变它们之间的交互。
 *     
 * 理解：降低类之间耦合。
 */
interface Mediator{
	void createMediator();
	void workAll();
}
class MyMediator implements Mediator{
	private User user1;
	private User user2;
	public User getUser1(){
		return user1;
	}
	public User getUser2(){
		return user2;
	}
	@Override
	public void createMediator(){			//创建“关系”，User和Mediator之间是相互的
		user1 = new User1(this);
		user2 = new User2(this);
	}
	@Override
	public void workAll(){
		user1.work();
		user2.work();
	}
}
abstract class User{
	private Mediator mediator;
	public Mediator getMediator(){
		return mediator;
	}
	public User(Mediator mediator){
		this.mediator = mediator;
	}
	public abstract void work();
}
class User1 extends User{
	public User1(Mediator mediator){
		super(mediator);
	}
	@Override
	public void work(){
		System.out.println("user1 exe!");
	}
}
class User2 extends User{
	public User2(Mediator mediator){
		super(mediator);
	}
	@Override
	public void work(){
		System.out.println("user2 exe!");
	}
}
class Test {  
    public static void main(String[] args) {  
        Mediator mediator = new MyMediator();  
        mediator.createMediator();  
        mediator.workAll();  
    }  
}