Java - generuj unikalne liczby losowe

List<Integer> list = new ArrayList<>();

for (int i = 1; i <= 10; i++) {

    list.add(i);

}

Collections.shuffle(list);

​

// [8, 9, 7, 2, 10, 5, 3, 6, 1, 4]

System.out.println(list);

Set<Integer> unique = new HashSet<>();

​

while (unique.size() != 10) {

    int randInt = ThreadLocalRandom.current().nextInt(1, 20);

    unique.add(randInt);

}

​

// [16, 1, 17, 18, 6, 9, 10, 13, 14, 15]

System.out.println(unique.toString());

List<Integer> list = ThreadLocalRandom.current()

        .ints(1, 20)

        .boxed()

        .distinct()

        .limit(10)

        .collect(Collectors.toList());

​

// [3, 17, 9, 15, 4, 19, 18, 16, 14, 8]

System.out.println(list);