Java设计模式——中介者模式

package com.smlq;
import java.util.ArrayList;
import java.util.List;
/**
 * @author BushRo
 * @Description: 中介模式
 * @date 2019-11-24
 */
public class MediatorPattern {
    public static void main(String[] args) {
        Mediator md=new ConcreteMediator();
        Colleague c1,c2;
        c1=new ConcreteColleague1();
        c2=new ConcreteColleague2();
        md.register(c1);
        md.register(c2);
        c1.send();
        System.out.println("-------------");
        c2.send();
    }
}
/**
 * 抽象中介者
 */
abstract class Mediator{
    /**
     * 同事对象注册
     */
    abstract void register(Colleague colleague);
    /**
     *  转发同事对象信息
     */
    abstract void relay(Colleague colleague);
}
/**
 * 具体中介者
 */
class ConcreteMediator extends Mediator{
    List<Colleague> colleagueList=new ArrayList<>();
    @Override
    void register(Colleague colleague) {
        if(!colleagueList.contains(colleague)) {
            colleagueList.add(colleague);
            colleague.setMediator(this);
        }
    }
    @Override
    void relay(Colleague colleague) {
        for(Colleague ob:colleagueList) {
            if(!ob.equals(colleague)) {
                ob.receive();
            }
        }
    }
}
/**
 * 抽象同事类
 */
abstract class Colleague{
    public Mediator mediator;
    public void setMediator(Mediator mediator) {
        this.mediator = mediator;
    }
    //接收信息
    abstract void receive();
    //发送信息
    abstract void send();
}
/**
 * 具体同事类1
 */
class ConcreteColleague1 extends Colleague
{
    public void receive() {
        System.out.println("具体同事类1收到请求。");
    }
    public void send() {
        System.out.println("具体同事类1发出请求。");
        mediator.relay(this); //请中介者转发
    }
}
/**
 * 具体同事类2
 */
class ConcreteColleague2 extends Colleague{
    public void receive() {
        System.out.println("具体同事类2收到请求。");
    }
    public void send() {
        System.out.println("具体同事类2发出请求。");
        mediator.relay(this); //请中介者转发
    }
}