模拟购买火车票（线程）

//SellTicket.java

public class SellTicket extends Thread{
private int ticket=20;
public void run(){
while(true)
if(ticket>0){
System.out.println(Thread.currentThread().getName()+"-->"+ticket);
ticket--;
}else
break;
}
}


//SellTicketTest.java

public class SellTicketTest {
public static void main(String[] args){
SellTicket st=new SellTicket();
new Thread(st,"第一售票点").start();
new Thread(st,"第二售票点").start();
new Thread(st,"第三售票点").start();
new Thread(st,"第四售票点").start();
}
}