CountDownLatch允许一个或多个线程等待其他线程完成操作
以下示例将等待10秒钟的时间，才完成所有任务。
package concurrent; import java.util.concurrent.CountDownLatch; /** * Desc: CountDownLatch使用 * Creator: pengweixiang * Date: 2019-05-26 */ public class CountDownLatchTest { private static CountDownLatch count = new CountDownLatch(5); public static void main(String[] args) { new Thread(() -> { count.countDown(); //task1 cost 10 seconds TimeUtils.sleep(10); }).start(); for (int i = 0; i < 4; i++) { new Thread(() -> { count.countDown(); //other task cost 1 second. TimeUtils.sleep(1); }).start(); } try { count.await(); } catch (InterruptedException e) { System.out.println("waiting interrupt"); } } }