信号灯法

package edu.wtbu;
//测试生产者和消费者：信号灯
public class Demo03 {
    public static void main(String[] args) {
        TV tv = new TV();
        new Player(tv).start();
        new Watcher(tv).start();
    }
}
//生产者：演员
class Player extends Thread{
    TV tv;

    public Player(TV tv) {
        this.tv = tv;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            if(i%2==0){
                this.tv.play("快手");
            }else{
                this.tv.play("抖音");
            }
        }
    }
}
//消费者：观众
class Watcher extends Thread{
    TV tv;

    public Watcher(TV tv) {
        this.tv = tv;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            if(i%2==0){
                this.tv.watch("看快手");
            }else{
                this.tv.watch("看抖音");
            }
        }
    }

}
//产品：节目
class TV {
    //演员表演，观众等待
    //观众观看，演员等待
    String voice;//表演的节目

    boolean flag=true;

    //表演
    public synchronized void play(String voice){
        if (!flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
        System.out.println("演员表演了"+voice);
        //通知观众观看
        this.notifyAll();//通知唤醒
        this.voice=voice;
        this.flag=!this.flag;

    }

    //观看
    public synchronized void watch(String voice){
        if (flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
        System.out.println("观众观看了"+voice);
        //通知演员表演
        this.notifyAll();//通知唤醒
        this.flag=!this.flag;

    }
}