Java tutorial
import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Random; import java.util.Set; public class Main { public static void main(String[] args) { Random random = new Random(); Set<Integer> set = new HashSet<Integer>(); while (set.size() < 5) { set.add(random.nextInt()); } List<Integer> result = new ArrayList<Integer>(set); System.out.println(result); } }