/**
*
* @描述: 同步工具
* 表示大家彼此等待，大家集合好后才开始出发，分散活动后又在指点地点集合碰合 .
* @作者: Wnj .
* @创建时间: 2017年5月16日 .
* @版本: 1.0 .
*/
public class CyclicBarrierTest { public static void main(String[] args) {
ExecutorService service = Executors.newCachedThreadPool();
//要有三个线程到了才走
final CyclicBarrier cb = new CyclicBarrier(3);
for (int i = 0; i < 3; i++) {
Runnable runnable = new Runnable() {
public void run() {
try {
Thread.sleep((long)(Math.random() * 10000)); System.out.println("线程" + Thread.currentThread().getName() + "即将到达集合地点1，当前已有"
+ (cb.getNumberWaiting() + 1) + "个已经到达，" + (cb.getNumberWaiting() == 2 ? "都到齐了，继续走啊" : "正在等候"));
//三个线程的第N个线程等待
cb.await(); Thread.sleep((long)(Math.random() * 10000));
System.out.println("线程" + Thread.currentThread().getName() + "即将到达集合地点2，当前已有"
+ (cb.getNumberWaiting() + 1)
+ "个已经到达，" + (cb.getNumberWaiting() == 2 ? "都到齐了，继续走啊" : "正在等候")); //三个线程的第N个线程等待
cb.await();
Thread.sleep((long)(Math.random() * 10000));
System.out.println("线程" + Thread.currentThread().getName() + "即将到达集合地点3，当前已有"
+ (cb.getNumberWaiting() + 1)
+ "个已经到达，" + (cb.getNumberWaiting() == 2 ? "都到齐了，继续走啊" : "正在等候")); //三个线程的第N个线程等待
cb.await();
}
catch (Exception e) {
e.printStackTrace();
}
}
};
service.execute(runnable);
}
service.shutdown();
}
}