设计模式：中介者模式

概念

用一个中介对象来封装一系列的对象交互，中介者使各对象不需要显示地相互引用，从而使其耦合松散，而且可以独立地改变它们之间地交互。

代码

抽象中介类

public abstract class AbstractMediator {
    
    
    public abstract void notify(String string, AbstractCharacter character);
}

抽象的人物类

public abstract class AbstractCharacter {
    
    
    protected AbstractMediator abstractMediator;

    public void setAbstractMediator(AbstractMediator abstractMediator) {
    
    
        this.abstractMediator = abstractMediator;
    }

    public abstract void send (String string) ;

    public abstract void notify(String string) ;
}

具体中介类

public class SunWukong extends AbstractMediator {
    
    
    private AbstractCharacter character1;
    private AbstractCharacter character2;

    public void setCharacter1(AbstractCharacter character1) {
    
    
        this.character1 = character1;
    }

    public void setCharacter2(AbstractCharacter character2) {
    
    
        this.character2 = character2;
    }

    @Override
    public void notify(String string, AbstractCharacter character) {
    
    
        if (character.equals(this.character1)) {
    
    
            this.character2.notify(string);
        } else {
    
    
            this.character1.notify(string);
        }
    }
}

具体的人物类1

public class EmperorYuHuang extends AbstractCharacter {
    
    
    @Override
    public void send(String string) {
    
    
        this.abstractMediator.notify("玉皇大帝："+string, this);
    }

    @Override
    public void notify(String string) {
    
    
        System.out.println(string);
    }
}

具体的人物类2

public class SheriffYuHuang extends AbstractCharacter {
    
    
    @Override
    public void send(String string) {
    
    
        this.abstractMediator.notify("凤仙郡长："+string, this);
    }

    @Override
    public void notify(String string) {
    
    
        System.out.println(string);
    }
}

客户端

public class Client  {
    
    
    public static void main(String[] args) {
    
    
        SunWukong sunWukong = new SunWukong();
        AbstractCharacter sheriffFengXian = new SheriffYuHuang();
        AbstractCharacter emperorYuHuang = new EmperorYuHuang();
        sunWukong.setCharacter1(sheriffFengXian);
        sunWukong.setCharacter2(emperorYuHuang);
        sheriffFengXian.setAbstractMediator(sunWukong);
        emperorYuHuang.setAbstractMediator(sunWukong);

        emperorYuHuang.send("凤仙郡长，你为什么要打翻我的祭品");
        sheriffFengXian.send("我那时要惩治我不肖的儿子");

        emperorYuHuang.send("那你们凤仙郡别想下雨了");
        sheriffFengXian.send("不要啊！");
    }
}

特点