代码块
```package com.foreknow.thread1;
class Ticket extends Thread{
    private static int ti=100;
    @Override
    public void run() {
        while(true) {
            synchronized (Ticket.class) {
            if(ti<=0) {
                break;
            }
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println(getName()+"------"+(ti-1)+"号票被卖完");
    }
  }
}
}
public class SaleTicket {
    public static void main(String[] args) {
        Ticket t1=new Ticket();
        Ticket t2=new Ticket();
        Ticket t3=new Ticket();
        Ticket t4=new Ticket();
        t1.setName("1");
        t2.setName("2");
        t3.setName("3");
        t4.setName("4");
        t1.start();
        t2.start();
        t3.start();
        t4.start();
        
    }

}