中介者模式

有啥用

就是把各个对象的交互放在一个公共的场所，也可以理解为第三方。就好像是房屋中介和婚姻介绍所。最典型的例子就是MVC。

类图

类图.png

结果

买家:大哥，要盘吗？
卖家:滚！

Process finished with exit code 0

使用

package com.company;

public class Main {

    public static void main(String[] args) {
    // write your code here
        Market market = new Market();
        Solder solder = new Solder(market);
        Buyer buyer = new Buyer(market);
        market.setBuyer(buyer);
        market.setSolder(solder);

        solder.sendMessage("大哥，要盘吗？");
        buyer.sendMessage("滚！");
    }
}

抽象的中介者

package com.company;

public abstract class Mediary {
    void sendMessage(String message,Participant participant) {}
}

具体的中介者——市场

package com.company;

public class Market extends Mediary {
    private Participant buyer;
    private Participant solder;

    public void setBuyer(Participant buyer) {
        this.buyer = buyer;
    }

    public void setSolder(Participant solder) {
        this.solder = solder;
    }

    @Override
    void sendMessage(String message,Participant participant) {
        super.sendMessage(message,participant);
        if (participant == buyer) {
            System.out.println("卖家:" + message);
        } else {
            System.out.println("买家:" + message);
        }
    }
}

通过中介交互的各方

package com.company;

public abstract class Participant {
    protected Mediary mediary;

    void sendMessage(String message) {}
}

卖方

package com.company;

public class Solder extends Participant {
    public Solder(Mediary mediary) {
        this.mediary = mediary;
    }

    @Override
    void sendMessage(String message) {
        super.sendMessage(message);
        this.mediary.sendMessage(message,this);
    }
}

买家

package com.company;

public class Buyer extends Participant {
    public Buyer(Mediary mediary) {
        this.mediary = mediary;
    }

    @Override
    void sendMessage(String message) {
        super.sendMessage(message);
        this.mediary.sendMessage(message,this);
    }
}

多谢捧场

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