例如 ：
Integer[] arr = {3,6,7,11,20};
List<Integer> shuffled = new ArrayList<>();
for (Integer i : arr)
shuffled.addAll (Collections.nCopies(x,i)); // add i to your List x times
Collections.shuffle(shuffled); // shuffle the List to get random order
或者（如果您不想使用Collections.nCopies(x,i)）：
Integer[] arr = {3,6,7,11,20};
List<Integer> shuffled = new ArrayList<>();
for (int j = 0; j < x; j++)
for (Integer i : arr)
shuffled.add (i);
Collections.shuffle(shuffled); // shuffle the List to get random order
602392714
清零编程群