java的CyclicBarrier

在Java中CyclicBarrier的用途个人理解主要用在线程的同步，可以让多个线程之间进行等待，如果线程达到设置的线程那么就可以继续往下运行，例如：

import java.util.concurrent.CyclicBarrier;

public class CyclicBarrierDemo {
	public static void main(String[] args) {
		Runnable barrier1Action = new Runnable() {
			public void run() {
				System.out.println("BarrierAction 1 executed ");
			}
		};
		Runnable barrier2Action = new Runnable() {
			public void run() {
				System.out.println("BarrierAction 2 executed ");
			}
		};

		CyclicBarrier barrier1 = new CyclicBarrier(2, barrier1Action);
		CyclicBarrier barrier2 = new CyclicBarrier(2, barrier2Action);

		CyclicBarrierRunnable barrierRunnable1 = new CyclicBarrierRunnable(barrier1, barrier2);

		CyclicBarrierRunnable barrierRunnable2 = new CyclicBarrierRunnable(barrier1, barrier2);

		new Thread(barrierRunnable1).start();
		new Thread(barrierRunnable2).start();
		
	}
}

mport java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;

public class CyclicBarrierRunnable implements Runnable {
	CyclicBarrier barrier1 = null;
	CyclicBarrier barrier2 = null;

	public CyclicBarrierRunnable(CyclicBarrier barrier1, CyclicBarrier barrier2) {

		this.barrier1 = barrier1;
		this.barrier2 = barrier2;
	}

	public void run() {
		try {
			Thread.sleep(1000);
			System.out.println(Thread.currentThread().getName() + " waiting at barrier 1");
			this.barrier1.await();

			Thread.sleep(1000);
			System.out.println(Thread.currentThread().getName() + " waiting at barrier 2");
			this.barrier2.await();

			System.out.println(Thread.currentThread().getName() + " done!");

		} catch (InterruptedException e) {
			e.printStackTrace();
		} catch (BrokenBarrierException e) {
			e.printStackTrace();
		}
	}
}