Compare elements in an array for duplicates

Question

I am trying to generate a 5 digit int array in Java and am having trouble on where to start. None of the numbers in the array can be duplicates. I can generate

Answer 1

try this:

int[] digits = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
Random random = new Random();

int[] generateId() {
    int[] clone = digits.clone();
    int[] id = new int[5];

    for (int i = 0; i < 5; i++) {
        int candidate;

        do {
            candidate = random.nextInt(10);
        } while (clone[candidate] == -1);

        id[i] = clone[candidate];
        clone[candidate] = -1;
    }

    return id;
}