public class TicketsTest{
 public static void main(String[] args) {
 
 SakeTickets st = new SakeTickets();
 Thread[] t = new Thread[3];
 for (int i = 0; i < t.length; i++) {
 t[i] = new Thread(st,"售票口"+(i+1));
 t[i].start();
 }
 
 
 }
}

public class SakeTickets implements Runnable{
private int totalTickets =200;

public void run(){
 while(totalTickets>0)
 sale();
}
public void sale(){
 synchronized (this) {
 String name = Thread.currentThread().getName();
 if(totalTickets==0)
 System.out.println(name+" 票已售完。");
 else{
 totalTickets--;
 try {
 Thread.sleep(57);
 } catch (InterruptedException e) {
 e.printStackTrace();
 }
 System.out.printf(name+" 售出一张票，还剩：%-3d张。\n",totalTickets);
 }
 }
}
}