卖火车票---java线程

package com.pcs;public class TicketDemo{public static void main(String[] args){Demo d=new Demo();for(int i=0;i<5;i++)new Thread(d,"售票口 "+(i+1)+"  ：").start();}}class Demo implements Runnable{private volatile int num=100;public void run(){while(num>0){synchronized(this){try{Thread.sleep(100);}catch(Exception e){}if(num>0){System.out.println(Thread.currentThread().getName()+num);num--;}}}}}