设计模式--中介者模式（调停者模式）

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 作用：当复杂功能应用之间重复调用时，在中间添加一层中介者包装服务，对外提供简单、通用和易扩展的服务能力。比如“联合国” 就是中介者，各个国家可以通过“联合国”通信。

接下来看代码：

模拟人之间沟通，通过中介。

1. 抽象中介者类

public abstract class Mediator {abstract void send(String message , Colleague colleague);
}

 2. 抽象同事类

public abstract class Colleague {protected Mediator mediator;public Colleague(Mediator mediator){this.mediator  = mediator;}abstract void send(String message);
}

3. 具体中介者类

public class ConcreteMediator extends Mediator{private ConcreteColleague1 concreteColleague1;private ConcreteColleague2 concreteColleague2;public ConcreteMediator setConcreteColleague1(ConcreteColleague1 concreteColleague1) {this.concreteColleague1 = concreteColleague1;return this;}public ConcreteMediator setConcreteColleague2(ConcreteColleague2 concreteColleague2) {this.concreteColleague2 = concreteColleague2;return this;}@Overridepublic void send(String message, Colleague colleague) {if(colleague == concreteColleague1) {concreteColleague2.notify(message);}else {concreteColleague1.notify(message);}}
}

4. 同事实现类

public class ConcreteColleague1 extends Colleague{public ConcreteColleague1(Mediator mediator) {super(mediator);}@Overridepublic void send(String message) {mediator.send(message,this);}public void notify(String message){System.out.println("NO1 message: " + message);}
}public class ConcreteColleague2 extends Colleague{public ConcreteColleague2(Mediator mediator) {super(mediator);}@Overridepublic void send(String message) {mediator.send(message,this);}public void notify(String message){System.out.println("NO2 message:" + message);}
}

5. 测试类

public class Test {public static void main(String[] args) {ConcreteMediator concreteMediator = new ConcreteMediator();ConcreteColleague1 concreteColleague1  = new ConcreteColleague1(concreteMediator);ConcreteColleague2 concreteColleague2 = new ConcreteColleague2(concreteMediator);concreteMediator.setConcreteColleague1(concreteColleague1);concreteMediator.setConcreteColleague2(concreteColleague2);concreteColleague1.send("你好！！！！");concreteColleague2.send("好的。。。");}
}/****> Task :Test.main()
NO2 message:你好！！！！
NO1 message: 好的。。。***/

 减少了同事之间的耦合度。。。

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