import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
 
public class IntegerDemo {
  public static void main(String[] args) {
    // 创建3个线程对象
    SellTicket st = new SellTicket();
 
    Thread t1 = new Thread(st, "窗口1");
    Thread t2 = new Thread(st, "窗口2");
    Thread t3 = new Thread(st, "窗口3");
 
    // 启动线程
    t1.start();
    t2.start();
    t3.start();
  }
}
 
class SellTicket implements Runnable {
  private int ticket = 100;
  private Lock lock = new ReentrantLock();
 
  public void run() {
    while (true) {
      lock.lock();
 
      if (ticket > 0) {
        try {
          Thread.sleep(100);
        } catch (InterruptedException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
 
        System.out.println(Thread.currentThread().getName() + "正在出售第" + (ticket--) + "张票。");
      }
 
      lock.unlock();
    }
  }
}