public class Demo4 {    public static void main(String[] args) {        // TODO Auto-generated method stub        Tickets t=new Tickets();        Thread th0=new Thread(t);        Thread th1=new Thread(t);        Thread th2=new Thread(t);        th0.start();        th1.start();        th2.start();    }}

public class Tickets extends Thread{    private int ticket=100;    //对象锁    private Object obj=new Object();    public void run(){        while(true){            synchronized (obj) {                if(ticket>0){                try {                    Thread.sleep(10);                } catch (InterruptedException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }                System.out.println(Thread.currentThread().getName()+"出售第"+ticket--+"张票");            }            }                    }    }}