设计模式之中介者模式

中介者模式，又称为调停者模式或调解者模式

１．中介者模式结构图

示例代码

//　抽象中介类
public abstract class Mediator {

    protected ConcreteColleagueA concreteColleagueA;

    protected ConcreteColleagueB concreteColleagueB;

    public void setConcreteColleagueA(ConcreteColleagueA concreteColleagueA) {
        this.concreteColleagueA = concreteColleagueA;
    }

    public void setConcreteColleagueB(ConcreteColleagueB concreteColleagueB) {
        this.concreteColleagueB = concreteColleagueB;
    }

    public abstract void methodA();

    public abstract void methodB();
}

//　具体中介类
public class ConcreteMediator extends Mediator{

    public void methodA(){
        concreteColleagueB.doWorkB();
    }

    public void methodB(){
        concreteColleagueA.doWorkA();
    }
}


// 抽象同事类
public abstract class Colleague {

    protected Mediator mediator;

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

//　具体同事类Ａ
public class ConcreteColleagueA extends Colleague{

    public ConcreteColleagueA(Mediator mediator) {
        super(mediator);
    }

    public void selfMethodA(){
        mediator.methodA();
    }

    public void doWorkA(){
        System.out.println("具体处理对象A开始处理问题");
    }
}

//　具体同事类Ｂ
public class ConcreteColleagueB extends Colleague{

    public ConcreteColleagueB(Mediator mediator) {
        super(mediator);
    }

    public void selfMethodB(){
        mediator.methodB();
    }

    public void doWorkB(){
        System.out.println("具体处理对象B开始处理问题");
    }
}

// 测试类
public class MediatorTest {

    public static void main(String[] args) {
        ConcreteMediator mediator = new ConcreteMediator();
        ConcreteColleagueA colleagueA = new ConcreteColleagueA(mediator);
        ConcreteColleagueB colleagueB = new ConcreteColleagueB(mediator);
        mediator.setConcreteColleagueA(colleagueA);
        mediator.setConcreteColleagueB(colleagueB);

        colleagueA.selfMethodA();
    }
}