线程通信

案例 

package com.itheima.d4;

public class ThreadTest {
    public static void main(String[] args) {
        Desk desk = new Desk();
        //创建3个生产者线程
        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
        new Thread(() -> {
            while (true) {
                desk.get();
            }
        }, "消费者1").start();

        new Thread(() -> {
            while (true) {
                desk.get();
            }
        }, "消费者2").start();
    }
}

 

 

package com.itheima.d4;

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 + "做了一个肉包子");
                System.out.println(name + "做了一个肉包子");
                Thread.sleep(2000);

                //唤醒别人,等待自己
                this.notifyAll();
                this.wait();
            }else {
                //有了包子，不做了
                //唤醒别人,等待自己
                this.notifyAll();
                this.wait();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //消费者1 消费者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));
                list.clear();
                Thread.sleep(1000);
                this.notifyAll();
                this.wait();
            }else {
                //没有包子
                this.notifyAll();
                this.wait();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}