利用Executors.newSingleThreadScheduledExecutor()创建一个定时任务线程案例，其中利用CountDownLatch闭锁进行阻塞

Posted 2022-12-12 Acmen-zym

 public static void main(String[] args) throws InterruptedException 
        CountDownLatch downLatch = new CountDownLatch(1);
        Thread thread = Thread.currentThread();
        AtomicInteger count = new AtomicInteger();//原子类统计
        thread.setName("thread-1");//覆盖一下当前线程
        String name = thread.getName();
        Map<String, ScheduledFuture<?>> futureMap = new HashMap<>();
        ScheduledFuture<?> scheduledFuture = Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(() -> 
            int andIncrement = count.getAndIncrement();
            if (andIncrement == 5) 
                downLatch.countDown();
                futureMap.get(name).cancel(true);
            
            String format = LocalDateTime.now().atZone(ZoneId.systemDefault()).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH-mm-ss"));
            System.out.println(format + " andIncrement = " + andIncrement);
            //第一次执行间隔5秒,后续间隔三秒执行
        , 5, 3, TimeUnit.SECONDS);
        futureMap.put(name, scheduledFuture);
        downLatch.await();//利用闭锁进行阻塞
        System.out.println("scheduledFuture = " + scheduledFuture.isDone());
        System.out.println("结束--------------");