javaCountDownLatch闭锁

package com.java.concurrent;

import java.util.concurrent.CountDownLatch;
/**
 * CountDownLatch: 闭锁，在完成某些运算的时候，只有其它所有线程的运算全部完成后，当前运算才会执行
 * @author fliay
 *
 */
public class TestCountDownLatch {

	public static void main(String[] args) {
		final CountDownLatch latch = new CountDownLatch(10);
		LactchDemo Ld = new LactchDemo(latch);
		long start = System.currentTimeMillis();
		for (int i = 0; i < 5; i++) {
			new Thread(Ld).start();
			new Thread(Ld).start();
		}

		try {
			latch.await();//执行等待
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		long end = System.currentTimeMillis();
		System.out.println("消耗时间为：" + (end - start));

	}

}

class LactchDemo implements Runnable {

	private CountDownLatch latch;

	public LactchDemo(CountDownLatch latch) {
		this.latch = latch;
	}

	public void run() {
		synchronized (this) {
			try {
				for (int i = 0; i < 10; i++) {
					if (i % 2 == 0) {
						System.out.println(i);
					}
				}
			} finally {
				// 启动闭锁
				latch.countDown();
			}
		}

	}

}