import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
import java.util.logging.Level;
import java.util.logging.Logger;/**
* Java program to demonstrate how to use CyclicBarrier in Java. CyclicBarrier is a
* new Concurrency Utility added in Java 5 Concurrent package.
*
* @author Javin Paul
*/public class CyclicBarrierExample {//Runnable task for each thread
private static class Task implements Runnable {private CyclicBarrier barrier;public Task(CyclicBarrier barrier) {
this.barrier = barrier;
}@Override
public void run() {
try {
System.out.println(Thread.currentThread().getName() + " is waiting on barrier");
barrier.await();
System.out.println(Thread.currentThread().getName() + " has crossed the barrier");
} catch (InterruptedException ex) {
Logger.getLogger(CyclicBarrierExample.class.getName()).log(Level.SEVERE, null, ex);
} catch (BrokenBarrierException ex) {
Logger.getLogger(CyclicBarrierExample.class.getName()).log(Level.SEVERE, null, ex);
}
}
}public static void main (String args[]) {//creating CyclicBarrier with 3 parties i.e. 3 Threads needs to call await()
final CyclicBarrier cb = new CyclicBarrier(3, new Runnable(){
@Override
public void run(){
//This task will be executed once all thread reaches barrier
System.out.println("All parties are arrived at barrier, lets play");
}
});//starting each of thread
Thread t1 = new Thread(new Task(cb), "Thread 1");
Thread t2 = new Thread(new Task(cb), "Thread 2");
Thread t3 = new Thread(new Task(cb), "Thread 3");t1.start();
t2.start();
t3.start();}
}

输出：

Thread 1 is waiting on barrier
Thread 3 is waiting on barrier
Thread 2 is waiting on barrier
All parties are arrived at barrier, lets play
Thread 3 has crossed the barrier
Thread 1 has crossed the barrier
Thread 2 has crossed the barrier

java.util.concurrent.BrokenBarrierException
at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:172)
at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:327)

参考： Javarevisited博客上的JCG合作伙伴 Javin Paul提供的Java 5中的CyclicBarrier示例–并发教程 。