Java Collection How to - Generate 6 different random numbers in java

Question

We would like to know how to generate 6 different random numbers in java.

Answer

import java.util.Arrays;
import java.util.HashSet;
import java.util.Random;
import java.util.Set;
//from  w  w w . j a v  a2  s .co  m
public class Main {
  public static void main(final String[] args) throws Exception {
    Random random = new Random();
    Set<Integer> intSet = new HashSet<>();
    while (intSet.size() < 6) {
      intSet.add(random.nextInt(49) + 1);
    }
    Integer[] ints = intSet.toArray(new Integer[intSet.size()]);
    System.out.println(Arrays.toString(ints));
  }
}

The code above generates the following result.