public static void main(String[] args) {

        List <Integer> intList = new ArrayList<Integer>();   //汉字随机放入的位子

        intList.add(1);

        intList.add(2);

        intList.add(3);

        intList.add(4);

        Collections.shuffle(intList);

        for (int i = 0; i < intList.size(); i++) {

            System.out.println(intList.get(i));

        }

        System.out.println("-----------------");

        Integer[] arr = new Integer[] {1, 2, 3, 4};

        List<Integer> list = Arrays.asList(arr);

        Collections.shuffle(list);

        for (int i = 0; i < list.size(); i++) {

            System.out.println(list.get(i));

        }

    }