There is an array in which there are 4 elements, how to randomly move these elements, for example, the first element became the third, the second fourth, and so on. And so every time in different ways.

    1 answer 1

    If you don’t think much about cryptographic stance then

    Collections.shuffle(list);
    • 3
      From myself I will add that, taking into account the features of the Arrays.asList(arr) method, you can mix the original arr [] array as follows: Collections.shuffle(Arrays.asList(arr)) Attention! not suitable for arrays of primitive types (int [], etc.). - Nikolay Romanov
    • I would say that this is a feature of the Collections.shuffle () method - Oleksiy Morenets