Java的生产者消费者的信号灯（标志位）实现

public class TestPCLight {
    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 (0==i%2){
                this.tv.play("大本营");
            }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++) {

                this.tv.watch();

        }
    }
}

//产品--》节目
class TV{

    String voice;//表演的节目
    boolean flag=true;

//    表演
    public synchronized void play(String voice){
        while (!flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("演员表演"+voice);
        //通知观众可以看表演了
        this.notify();//唤醒
        this.voice=voice;//演完的视频给观众
        this.flag=!this.flag;
    }

    //观看
    public synchronized void watch(){
        while (flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("观看了"+voice);
        //通知演员表演
        this.notify();
        this.flag=!flag;
    }

}