1. List<String> ips = new ArrayList<String>();
    2. Map<String, Boolean> map = new HashMap<String, Boolean>();
    3. // 线程数量
    4. CountDownLatch latch = new CountDownLatch(ips.size());
    6. System.out.println(DateFormatUtils.format(new Date(), "yyyy-MM-dd HH:mm:ss"));
    7. ips.forEach(ip -> {
    8.     Thread thread = new Thread() {
    9.         public void run() {
    10.             map.put(ip, PortConnectUtil.connect(ip));
    11.             // 线程计数器
    12.             latch.countDown();
    13.         }
    14.     };
    15.     thread.start();
    16. });
    17. // 1. 所有线程执行完毕再进行下面的操作
    18. latch.await();
    19. System.out.println(DateFormatUtils.format(new Date(), "yyyy-MM-dd HH:mm:ss"));
    20. System.out.println(map);