1 import java.util.concurrent.locks.ReentrantLock;
 2 
 3 class Windows implements Runnable{
 4 
 5     private int ticket = 100;
 6 
 7     //true:公平锁,先进先出；不写默认为false,不公平
 8     //1.实例化ReentrantLock
 9     private ReentrantLock lock = new ReentrantLock(true);
10 
11     @Override
12     public void run() {
13         while(true){
14             try{
15                 //2.调用lock()
16                 lock.lock();
17 
18                 if(ticket > 0){
19                     try {
20                         Thread.sleep(100);
21                     } catch (InterruptedException e) {
22                         e.printStackTrace();
23                     }
24                     System.out.println(Thread.currentThread().getName() + ": 售票 ：票号为： "+ ticket);
25                     ticket--;
26                 }else {
27                     break;
28                 }
29             }finally{
30                 //3.调用解锁的方法unlock()
31                 lock.unlock();
32             }
33         }
34     }
35 }
36 public class LockTest {
37     public static void main(String[] args) {
38         Windows w = new Windows();
39 
40         Thread t1 = new Thread(w);
41         Thread t2 = new Thread(w);
42         Thread t3 = new Thread(w);
43 
44         t1.setName("窗口1");
45         t2.setName("窗口2");
46         t3.setName("窗口3");
47 
48         t1.start();
49         t2.start();
50         t3.start();
51     }
52 }