中介者设计模式--练习

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1.UML

2.代码

Mediator

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

Colleague

abstract class Colleague{protected Mediator mediator; //中介public Colleague(Mediator mediator){this.mediator = mediator;}}

ColleagueColleagueA

class ConcreteColleagueA extends Colleague{public ConcreteColleagueA(Mediator mediator){super(mediator);}public void Send(String message){mediator.SendMessage(message, this);}public void Notify(String message){System.out.println("同事A收到消息: "+message);}}

ColleagueColleagueB

class ConcreteColleagueB extends Colleague{public ConcreteColleagueB(Mediator mediator){super(mediator);}public void Send(String message){mediator.SendMessage(message, this);}public void Notify(String message){System.out.println("同事B收到消息: "+message);}}

class ConcreteMediator extends Mediator{private  ConcreteColleagueA A;  //同事Aprivate  ConcreteColleagueB B;  //同事Bpublic void SendMessage(String message, Colleague colleague){if (colleague.equals(A)) //同事A发消息{B.Notify(message);   //同事B接收消息}else{A.Notify(message);}}    public void setConcreteColleagueA(ConcreteColleagueA A)    {    this.A = A;    }    public void setConcreteColleagueB(ConcreteColleagueB B)    {    this.B = B;    }}

Test

public class Test{public static void main(String[] args) {//中介ConcreteMediator  m = new ConcreteMediator();        //同事ConcreteColleagueA A = new ConcreteColleagueA(m);ConcreteColleagueB B = new ConcreteColleagueB(m);//将同事添加到中介中，组网m.setConcreteColleagueA(A);m.setConcreteColleagueB(B);//同事间聊天A.Send("吃饭没");B.Send("还没吃，要不请我吃饭");}}

3.结果

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