多個線程都完成才執行主線程

public static void test1() throws InterruptedException {
        //初始化線程數量
        CountDownLatch countDownLatch=ThreadUtil.newCountDownLatch(5);
        for(int i=0;i<5;i++){
            ThreadUtil.execute(() -> {
                try {
                    Thread.sleep(6000);
                    System.out.println("111" );
                    //調用線程計數器-1
                    countDownLatch.countDown();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            });
        }
        //喚醒主線程
        try {
            countDownLatch.await();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println("完成");

    }