package p2;public class TestThread {        public static void main(String args[]) throws InterruptedException{                        Thread1 t1 = new Thread1();        new Thread(t1).start();        new Thread(t1).start();        new Thread(t1).start();        new Thread(t1).start();        t1.stop();                            }}class Thread1 extends Thread{    private int tickets = 20;     public void run(){         while(true){             synchronized(this){                 if(tickets>0){                     try {                            Thread.sleep(10l);                        } catch (InterruptedException e) {                            // TODO Auto-generated catch block                            e.printStackTrace();                        }                     System.out.println(Thread.currentThread().getName()+"售票"+tickets--);                 }                 else{                     break;                 }                              }                     }               }}

模拟售票功能，总票数是20张，同时分四个窗口售票