循环使用CyclicBarrier的问题（标题不太好，请进来看看详细问题）

package test.thread.newfunction;



import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.concurrent.BrokenBarrierException;

import java.util.concurrent.CyclicBarrier;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;



public class CyclicBarrierTest3 {



	public CyclicBarrierTest3(){

		

		CyclicBarrier barrier = new CyclicBarrier(2, new Runnable() {

			

			@Override

			public void run() {

				System.out.println("所有线程都执行完了！");

			}

		}); 



		ExecutorService exec = Executors.newFixedThreadPool(2);

		

		Task t1 = new Task(barrier, 1, 3000);

		Task t2 = new Task(barrier, 2, 1000);

		

		exec.submit(t1); 

		exec.submit(t2); 

		

		exec.shutdown();

	}

	



	static String now() {

		SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");

		return sdf.format(new Date()) + ": ";

	}



	static class Task implements Runnable {



		private int threadNo = -1;

		private int time = 0;

		

		private CyclicBarrier barrier;



		public Task(CyclicBarrier barrier, int threadNo, int time) {

			this.barrier = barrier;

			this.threadNo = threadNo;

			this.time = time;

		}



		public void run() {

			

			try {

				System.out.println(now() + "第" + threadNo + "号线程在执行");

				Thread.sleep(time);

				System.out.println(now() + "第" + threadNo + "号线程执行完毕!!!  花费" + (time/1000) + "秒");

				barrier.await();

				

				

			} catch (InterruptedException e) {

			} catch (BrokenBarrierException e) {

			}

		}

	}

	

	public static void main(String[] args) { 

		new CyclicBarrierTest3();

	} 

}