Question

How to generate N unique random numbers between min and max in Java

Answer 1

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

public class NenerateNUniqueRandomNumbersBetweenMinAndMax_Java {
    public static Set<Integer> generateUniqueRandomNumbers(int N, int min, int max) {
        Set<Integer> uniqueNumbers = new HashSet<>();
        Random random = new Random();

        while (uniqueNumbers.size() < N) {
            uniqueNumbers.add(random.nextInt((max - min) + 1) + min);
        }

        return uniqueNumbers;
    }

    public static void main(String[] args) {
        int N = 8; // Number of unique random numbers

        Set<Integer> randomNumbers = generateUniqueRandomNumbers(N, 1, 20);

        for (int num : randomNumbers) {
            System.out.print(num + " ");
        }
    }
}


 
/*
run:
 
17 1 3 5 6 7 11 14 
 
*/

 

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