Generating Unique Random Numbers in Java

Question

I\'m trying to get random numbers between 0 and 100. But I want them to be unique, not repeated in a sequence. For example if I got 5 numbers, they should be 82,12,53,64,32

Answer 1

I feel like this method is worth mentioning.

   private static final Random RANDOM = new Random();    
   /**
     * Pick n numbers between 0 (inclusive) and k (inclusive)
     * While there are very deterministic ways to do this,
     * for large k and small n, this could be easier than creating
     * an large array and sorting, i.e. k = 10,000
     */
    public Set pickRandom(int n, int k) {
        final Set picked = new HashSet<>();
        while (picked.size() < n) {
            picked.add(RANDOM.nextInt(k + 1));
        }
        return picked;
    }