等待唤醒案例 包子铺和吃货

 

 

package com.programme.Demo02;

/**
 * @program: springboottest
 * @description: ${description}
 * @author: Mr.zw
 * @create: 2021-05-21 19:42
 **/
public class BaoZi {
    //让这个BaoZi类的对象，当作锁对象
    //创建变量，用来代表是否有包子
    //false 没包子 true 有包子
    boolean isHaveBaoZi = false;
}

　　

package com.programme.Demo02;

/**
 * @program: springboottest
 * @description: ${description}
 * @author: Mr.zw
 * @create: 2021-05-21 19:42
 **/
//消费者（吃货）
public class Consumer extends Thread{
    private BaoZi baoZi;

    public Consumer(BaoZi baoZi) {
        this.baoZi = baoZi;
    }
    @Override
    public void run() {
        while (true){
            synchronized (baoZi){
                if (!baoZi.isHaveBaoZi){
                    try {
                        baoZi.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                //如果代码执行到这里，说明一定有包子
                try {
                    System.out.println("吃货正在吃包子");
                    Thread.sleep(1000);
                    System.out.println("包子吃完了，包子铺快点做");
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                //修改变量，没有包子
                baoZi.isHaveBaoZi = false;
                //唤醒包子铺
                baoZi.notify();
            }
        }
    }
}

　　

package com.programme.Demo02;

/**
 * @program: springboottest
 * @description: ${description}
 * @author: Mr.zw
 * @create: 2021-05-21 19:40
 **/
//生产者（包子铺）
public class Producer extends Thread {

    private BaoZi baoZi;

    public Producer(BaoZi baoZi) {
        this.baoZi = baoZi;
    }

    @Override
    public void run() {
        while (true){
            synchronized (baoZi){
                //判断：如果有包子，就等待
                if (baoZi.isHaveBaoZi){
                    try {
                        baoZi.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                //如果代码执行到这里，说明一定没有包子

                try {
                    System.out.println("包子铺正在做包子");
                    Thread.sleep(1000);
                    System.out.println("包子做好了，吃货快来吃");
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                //修改变量，为有包子
                baoZi.isHaveBaoZi = true;
                //唤醒吃货线程
                baoZi.notify();

            }
        }
    }
}

　　

package com.programme.Demo02;

/**
 * @program: springboottest
 * @description: ${description}
 * @author: Mr.zw
 * @create: 2021-05-21 19:45
 **/
public class Test {
    public static void main(String[] args) {

        //baoZi对象里面有变量代表是否有包子
        //还可以作为两条线程的锁对象
        BaoZi baoZi = new BaoZi();
        Producer p = new Producer(baoZi);
        Consumer c = new Consumer(baoZi);

        p.start();
        c.start();
    }
}