设计模式 行为型模式 实例 -- 中介者模式实例：一对多聊天

Posted 2021-12-18 CodeJiao

01：中介者模式
02：设计模式 行为型模式 实例 – 中介者模式实例

1. 中介者模式实例

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1.1 需求分析：

多个Student和多个Teacher对象要进行谈话，
一个Student或Teacher可以把一句话对多个对象说，
请用中介者模式实现这一谈话过程。

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1.2 类图分析：

类图分析：

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1.2 代码实现：

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1.2.1 Mediator ：抽象中介者类

package ex09.mediator;

import java.util.ArrayList;

/**
 * ClassName: Mediator
 * Description: 抽象中介者类
 *
 * @author Tianjiao
 * @date 2021/11/22 15:07
 */
public abstract class Mediator 
    protected ArrayList<People> peopleList = new ArrayList<>();// 用于存储同事对象

    /**
     * 注册方法：用于新增同事对象
     */
    public void register(People people) 
        peopleList.add(people);
    

    public abstract void talk(String message, People people);

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1.2.2 People ：抽象同事类

package ex09.mediator;

/**
 * ClassName: People
 * Description: 抽象同事类
 *
 * @author Tianjiao
 * @date 2021/11/22 15:08
 */
public abstract class People 
    protected String name;
    protected Mediator mediator;

    public People(String name, Mediator mediator) 
        this.name = name;
        this.mediator = mediator;
        mediator.register(this);
    

    //和中介联系（沟通）
    public void talk(String message) 
        mediator.talk(message, this);
    

    // 获取消息
    public abstract void getMsg(String msg, People people);

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1.2.3 Student、Teacher ：具体同事类

Student :

package ex09.mediator;

/**
 * ClassName: Student
 * Description: 具体同事类
 *
 * @author Tianjiao
 * @date 2021/11/22 15:17
 */
public class Student extends People 
    public Student(String name, Mediator mediator) 
        super(name, mediator);
    

    @Override
    public void getMsg(String msg, People people) 
        System.out.println("学生：" + name + " 收到来自" + people.name + "的消息是：" + msg);
    

Teacher :

package ex09.mediator;

/**
 * ClassName: Teacher
 * Description: 具体同事类
 *
 * @author Tianjiao
 * @date 2021/11/22 15:17
 */
public class Teacher extends People 
    public Teacher(String name, Mediator mediator) 
        super(name, mediator);
    

    @Override
    public void getMsg(String msg, People people) 
        System.out.println("教师：" + name + " 收到来自" + people.name + "的消息是：" + msg);
    

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1.2.4 ConcreteMediator : 具体中介者

package ex09.mediator;

/**
 * ClassName: ConcreteMediator
 * Description: 具体中介者
 *
 * @author Tianjiao
 * @date 2021/11/22 15:26
 */
public class ConcreteMediator extends Mediator 
    @Override
    public void talk(String message, People peo) 
        for (People people : peopleList) 
            // 让除了本人之外的所有人收到消息
            if (people != peo) 
                people.getMsg(message, peo);
            
        
    

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1.2.5 Client : 客户端类

package ex09.mediator;

/**
 * ClassName: Client
 * Description:客户端类：测试类
 *
 * @author Tianjiao
 * @date 2021/11/22 15:25
 */
public class Client 
    public static void main(String[] args) 
        Mediator mediator = new ConcreteMediator();
        Teacher teacher01 = new Teacher("教师1", mediator);
        Teacher teacher02 = new Teacher("教师2", mediator);
        Teacher teacher03 = new Teacher("教师3", mediator);

        Student student01 = new Student("学生1", mediator);
        Student student02 = new Student("学生2", mediator);
        Student student03 = new Student("学生3", mediator);

        teacher01.talk("Hello World");
    

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1.2.6 运行结果：

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