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

This will work to generate unique random numbers................

import java.util.HashSet;
import java.util.Random;

public class RandomExample {

    public static void main(String[] args) {
        Random rand = new Random();
        int e;
        int i;
        int g = 10;
        HashSet randomNumbers = new HashSet();

        for (i = 0; i < g; i++) {
            e = rand.nextInt(20);
            randomNumbers.add(e);
            if (randomNumbers.size() <= 10) {
                if (randomNumbers.size() == 10) {
                    g = 10;
                }
                g++;
                randomNumbers.add(e);
            }
        }
        System.out.println("Ten Unique random numbers from 1 to 20 are  : " + randomNumbers);
    }
}