中文名

倒計(jì)時(shí)閂鎖

功能

通過(guò)計(jì)數(shù)器功能，控制線程的執(zhí)行順序。

代碼示例

 public static void main(String[] args) throws InterruptedException {

        System.out.println("主線程開(kāi)始執(zhí)行");
        CountDownLatch countDownLatch = new CountDownLatch(10);

        for (int i = 0; i < 10; i++) {
            Executors.newFixedThreadPool(10).submit(new Task(countDownLatch, i));
        }
        countDownLatch.await();
        System.out.println("主線程結(jié)束執(zhí)行");
    }

    static class Task implements Runnable {

        CountDownLatch countDownLatch;
        int tag;

        Task(CountDownLatch countDownLatch, int tag) {
            this.countDownLatch = countDownLatch;
            this.tag = tag;
        }

        @Override
        public void run() {
            try {
                System.out.println(tag);
            } finally {
                countDownLatch.countDown();

            }
        }
    }

代碼示例介紹

在子線程完成任務(wù)后，才開(kāi)始執(zhí)行主線程