多线程使用同步实现卖火车票

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public static void main(String[] args) {
TestXian1 t1 = new TestXian1();
Thread tr1 = new Thread(t1);
Thread tr2 = new Thread(t1);
Thread tr3 = new Thread(t1);
tr1.start();
tr2.start();
tr3.start();
}
}

class TestXian1 implements Runnable 
{
   private int piaoshu = 100 ;
   Object obj = new Object();
public void run() 

{
while (true) 
{
synchronized(obj)
 {
if (piaoshu > 0)
{
try {
Thread.sleep(10);
} 

catch (InterruptedException e)

 {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+"......"+piaoshu--);
}
}
}
}
}