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

    int[] a = new int [size];

    for (int i = 0; i < size; i++) 
    {
        a[i] = (int)(Math.random()*16); //numbers from 0-15
        for (int j = 0; j < i; j++) 
        {
            //Instead of the if, while verifies that all the elements are different with the help of j=0
            while (a[i] == a[j])
            {
                a[i] = (int)(Math.random()*16); //numbers from 0-15
                j=0;
            }
        }
    }

    for (int i = 0; i < a.length; i++)
    {
        System.out.println(i + ".   " + a[i]);
    }