中介者（Mediator）模式实例

最新推荐文章于 2025-07-03 16:15:00 发布

原创最新推荐文章于 2025-07-03 16:15:00 发布 · 1.2k 阅读

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本文通过一个具体的同事间消息传递的实例，深入解析了中介者模式的实现方式。具体介绍了抽象中介者类、具体中介者类、抽象同事类及具体同事类的定义与作用，展示了如何通过中介者对象协调多个同事对象之间的交互。

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课本实例：同事间互相发送消息

每个具体同事只知道自己的行为，而不了解其他同事类的情况，但他们都认识中介者对象，中介者知道所有具体同事类，并从具体同事接受消息，向具体同事对象发出命令。

public abstract class Mediator { //抽象中介者类
    public abstract void send(String message,Colleague colleague);
}


public class ConcreteMediator extends Mediator { //具体中介者类
    private ConcreteColleague1 concreteColleague1;
    private ConcreteColleague2 concreteColleague2;

    public void setConcreteColleague1(ConcreteColleague1 concreteColleague1) {
        this.concreteColleague1 = concreteColleague1;
    }

    public void setConcreteColleague2(ConcreteColleague2 concreteColleague2) {
        this.concreteColleague2 = concreteColleague2;
    }

    @Override
    public void send(String message, Colleague colleague) {
        if (colleague == concreteColleague1)
            concreteColleague2.Notify(message);
        else
            concreteColleague1.Notify(message);
    }
}


public abstract class Colleague { //抽象同事类
    protected  Mediator mediator;

    public Colleague(Mediator mediator) {
        this.mediator = mediator;
    }
}


public class ConcreteColleague1 extends Colleague { //具体同事1
    public ConcreteColleague1(Mediator mediator) {
        super(mediator);
    }
    public void send(String message){
        mediator.send(message,this);
    }
    public void Notify(String message){
        System.out.println("同事1得到消息："+message);
    }
}


public class ConcreteColleague2 extends Colleague { //具体同事2
    public ConcreteColleague2(Mediator mediator) {
        super(mediator);
    }
    public void send(String message){
        mediator.send(message,this);
    }
    public void Notify(String message){
        System.out.println("同事2得到消息："+message);
    }
}


public class Client {
    public static void main(String[] args) {
        ConcreteMediator cm = new ConcreteMediator();
        ConcreteColleague1 c1 = new ConcreteColleague1(cm);
        ConcreteColleague2 c2 = new ConcreteColleague2(cm);
        cm.setConcreteColleague1(c1);
        cm.setConcreteColleague2(c2);
        c1.send("你吃饭了吗");
        c2.send("还没有，你打算请客？");
    }
}

UML图