1 import java.util.concurrent.CyclicBarrier;
2 import java.util.concurrent.ExecutorService;
3 import java.util.concurrent.Executors;
4
5 /**
6 * CyclicBarrier
7 * 表示大家彼此等待，大家集合好后才开始出发，分散活动后又在指定地点集合碰面，
8 * 这就好比整个公司的人员利用周末时间集合郊游一样，先各自从家出发到公司集合后，
9 * 再同时出发到公园游玩，在指定地点集合后再同时开始就餐。
10 * @author LiTaiQing
11 *
12 */
13 public class CyclicBarrierTest {
14 public static void main(String[] args) {
15 ExecutorService service = Executors.newCachedThreadPool();
16 final CyclicBarrier cb = new CyclicBarrier(3);
17 for (int i = 0; i < 3; i++) {
18 Runnable runnable = new Runnable() {
19 public void run() {
20 try {
21 Thread.sleep((long) (Math.random() * 10000));
22 System.out.println("线程"
23 + Thread.currentThread().getName()
24 + "即将到达集合地点1，当前已有"
25 + (cb.getNumberWaiting() + 1)
26 + "个已经到达，"
27 + (cb.getNumberWaiting() == 2 ? "都到齐了，继续走啊"
28 : "正在等候"));
29 cb.await();
30
31 Thread.sleep((long) (Math.random() * 10000));
32 System.out.println("线程"
33 + Thread.currentThread().getName()
34 + "即将到达集合地点2，当前已有"
35 + (cb.getNumberWaiting() + 1)
36 + "个已经到达，"
37 + (cb.getNumberWaiting() == 2 ? "都到齐了，继续走啊"
38 : "正在等候"));
39 cb.await();
40 Thread.sleep((long) (Math.random() * 10000));
41 System.out.println("线程"
42 + Thread.currentThread().getName()
43 + "即将到达集合地点3，当前已有"
44 + (cb.getNumberWaiting() + 1)
45 + "个已经到达，"
46 + (cb.getNumberWaiting() == 2 ? "都到齐了，继续走啊"
47 : "正在等候"));
48 cb.await();
49 } catch (Exception e) {
50 e.printStackTrace();
51 }
52 }
53 };
54 service.execute(runnable);
55 }
56 service.shutdown();
57 }
58 }
