public static void main(String[] args) {
        List<Integer> list = new ArrayList<>(Arrays.asList(1, 3, 4, 2));
        ThreadPoolExecutor threadPool = new ThreadPoolExecutor(
                10, 10, 20, TimeUnit.SECONDS, new ArrayBlockingQueue<>(10),
                new ThreadPoolExecutor.DiscardOldestPolicy());
        while (true) {
            try {
                threadPool.execute(() -> {
                    list.sort(Comparator.comparingInt(o -> o));
                    list.forEach(System.out::println);
                });
            } catch (ConcurrentModificationException e) {
                System.out.println(e.getMessage());
                break;
            }
        }

    }