Java Array of unique randomly generated integers

Question

public static int[] uniqueRandomElements (int size) {

    int[] a = new int[size];

    for (int i = 0; i < size; i++) {
        a[i] = (int)(Math.random()*10);
         


        

Answer 1

Input your size and get list of random unique numbers using Collections.

public static ArrayList noRepeatShuffleList(int size) {
    ArrayList arr = new ArrayList<>();
    for (int i = 0; i < size; i++) {
        arr.add(i);
    }
    Collections.shuffle(arr);
    return arr;
}

Elaborating Karthik's answer.