http://www.cnblogs.com/java-my-life/archive/2012/06/20/2554024.html





interface Mediator {
/**
* 同事对象在自身改变的时候来通知调停者方法 让调停者去负责相应的与其他同事对象的交互
*/
public void changed(Colleague c);
}

class ConcreteMediator implements Mediator {
// 持有并维护同事A
private ConcreteColleagueA colleagueA;
// 持有并维护同事B
private ConcreteColleagueB colleagueB;

public void setColleagueA(ConcreteColleagueA colleagueA) {
this.colleagueA = colleagueA;
}

public void setColleagueB(ConcreteColleagueB colleagueB) {
this.colleagueB = colleagueB;
}

@Override
public void changed(Colleague c) {
/**
* 某一个同事类发生了变化，通常需要与其他同事交互 具体协调相应的同事对象来实现协作行为
*/
}

}

abstract class Colleague {
// 持有一个调停者对象
private Mediator mediator;

/**
* 构造函数
*/
public Colleague(Mediator mediator) {
this.mediator = mediator;
}

/**
* 获取当前同事类对应的调停者对象
*/
public Mediator getMediator() {
return mediator;
}

}

class ConcreteColleagueA extends Colleague {

public ConcreteColleagueA(Mediator mediator) {
super(mediator);
}

/**
* 示意方法，执行某些操作
*/
public void operation() {
// 在需要跟其他同事通信的时候，通知调停者对象
getMediator().changed(this);
}
}

class ConcreteColleagueB extends Colleague {

public ConcreteColleagueB(Mediator mediator) {
super(mediator);
}

/**
* 示意方法，执行某些操作
*/
public void operation() {
// 在需要跟其他同事通信的时候，通知调停者对象
getMediator().changed(this);
}
}