逻辑分析

Java多线程间的通信:生产者消费者问题-LMLPHP
Java多线程间的通信:生产者消费者问题-LMLPHP
Java多线程间的通信:生产者消费者问题-LMLPHP

代码实现

package ThreadCommunction;

import sun.security.krb5.internal.crypto.Des;

import java.util.Date;

//目标:了解线程通信
public class ThreadTest {
    public static void main(String[] args) {
        //需求:3个生产者线程,负责产包子,每个线程每次只能生产1个包子放在桌子上
        //     2个消费者线程复杂吃包子,每人每次只能从桌子上拿1个包子吃
        Desk desk = new Desk();

        //创建3个生产者线程(3个厨师)
        new Thread(()-> {
            while (true) {
                desk.put();
            }

        },"厨师1").start();


        new Thread(()-> {
            while (true) {
                desk.put();
            }

        },"厨师2").start();


        new Thread(()-> {
            while (true) {
                desk.put();
            }

        },"厨师3").start();

        //创建2个消费者线程(2个吃货)
        new Thread(()-> {
            while (true) {
                desk.get();
            }

        },"吃货1").start();


        new Thread(()-> {
            while (true) {
                desk.get();
            }

        },"吃货2").start();

    }
}

package ThreadCommunction;

import java.util.ArrayList;
import java.util.List;

public class Desk {
    private List<String> list = new ArrayList<>();

    //放一个包子的方法
    //厨师1、厨师2、厨师3
    public synchronized void put() {
        try {
            String name =  Thread.currentThread().getName();
            //判断是否有包子
            if(list.size() ==0){
                list.add(name + "做的肉包子");
                System.out.println(name + "做了一个肉包子~~");
                Thread.sleep(2000);

                //唤醒别人,等待自己(顺序不能混)
                this.notify();
                this.wait();
            }else {
                //有包子了,不做了
                //唤醒别人,等待自己
                this.notify();
                this.wait();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //取一个包子
    //吃货1、吃货2
    public synchronized void get() {
        try {
            String name = Thread.currentThread().getName();
            if (list.size() == 1){
                //有包子,吃了
                System.out.println(name+"吃了"+list.get(0));
                //清空
                list.clear();
                //唤醒别人,等待自己
                Thread.sleep(1000);
                this.notify();
                this.wait();
            }else {
                //没有包子  唤醒别人,等待自己
                this.notify();
                this.wait();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

10-14 17:29