1 import java.util.concurrent.CountDownLatch;
2 import java.util.concurrent.ExecutorService;
3 import java.util.concurrent.Executors;
4
5 /**
6 * 16.Java5的CountDownLatch同步工具
7 * 犹如倒计时计数器，调用CountDownLatch对象的CountDown方法就将计数器减1，
8 * 当计数到达0事，则所有等待者或单个等待着开始执行。
9 *
10 * @author LiTaiQing
11 *
12 */
13 public class CountdownLatchTest {
14
15 public static void main(String[] args) {
16 ExecutorService service = Executors.newCachedThreadPool();
17 final CountDownLatch cdOrder = new CountDownLatch(1);
18 final CountDownLatch cdAnswer = new CountDownLatch(3);
19 for (int i = 0; i < 3; i++) {
20 Runnable runnable = new Runnable() {
21 public void run() {
22 try {
23 System.out.println("线程"
24 + Thread.currentThread().getName() + "正准备接受命令");
25 cdOrder.await();
26 System.out.println("线程"
27 + Thread.currentThread().getName() + "已接受命令");
28 Thread.sleep((long) (Math.random() * 10000));
29 System.out
30 .println("线程"
31 + Thread.currentThread().getName()
32 + "回应命令处理结果");
33 cdAnswer.countDown();
34 } catch (Exception e) {
35 e.printStackTrace();
36 }
37 }
38 };
39 service.execute(runnable);
40 }
41 try {
42 Thread.sleep((long) (Math.random() * 10000));
43
44 System.out.println("线程" + Thread.currentThread().getName()
45 + "即将发布命令");
46 cdOrder.countDown();
47 System.out.println("线程" + Thread.currentThread().getName()
48 + "已发送命令，正在等待结果");
49 cdAnswer.await();
50 System.out.println("线程" + Thread.currentThread().getName()
51 + "已收到所有响应结果");
52 } catch (Exception e) {
53 e.printStackTrace();
54 }
55 service.shutdown();
56
57 }
58 }
