Question

How to generate random numbers with no duplicates in Java

Answer 1

import java.util.LinkedHashSet;
import java.util.Random;
import java.util.Set;

public class MyClass {
    public static void main(String args[]) {
        Random randNum = new Random();
        Set<Integer>set = new LinkedHashSet<Integer>();
        
        while (set.size() < 10) {
            set.add(randNum.nextInt(20) + 1);
        }
        
        System.out.println(set);
    }
}



/*
run:

[3, 13, 6, 20, 17, 5, 16, 8, 10, 9]

*/

 

70+ SQL courses for beginners and professionals