通过标识符来组织消费者与生产者之间的关系：演员观众示例

代码内容

//测试生产者消费者问题2：信号灯发，标志位解决public class TestPC2 {       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("快乐大本营播放中");            }else {                   this.tv.play("抖音：记录美好生活");            }        }    }}//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{       //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) {                   e.printStackTrace();            }        }        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(){           if (flag){               try {                   this.wait();            } catch (InterruptedException e) {                   e.printStackTrace();            }        }        System.out.println("观看了："+voice);        //通知演员表演        this.notifyAll();        this.flag= !this.flag;    }}

运行结果