public class ThreadDemo3
{
    public static void main(String [] args)
    {
       ThreadTest t=new ThreadTest();
       new Thread(t).start();
       new Thread(t).start();
       new Thread(t).start();
       new Thread(t).start();
    }
}
class ThreadTest implements Runnable    //將資源共享
{
    private int tickets=100;
    public void run()
    {
       while(true)
       {
          if(tickets>0)
              System.out.println(Thread.currentThread().getName()+" is saling ticket "+tickets--);
       }
    }
}