How to generate random numbers in a range using Java

Here is a simple method to generate a random number in a range using Java.

Code

package com.admfactory.basic;

import java.security.SecureRandom;

public class RandomNumberRangeGenerator {

    private static SecureRandom random = new SecureRandom();

    /**
     * Return random number between min and max
     * 
     * @param min
     *            the minimum value
     * @param max
     *            the maximum value
     * @return random number between min and max
     */
    public static int random(int min, int max) {
	return random.nextInt(max - min) + min;
    }

    public static void main(String[] args) {
	System.out.println("Random numbers in range example");
	System.out.println();
	System.out.println("Random number between 10 and 20: " + random(10, 20));

	System.out.println();
	System.out.println("Random number between 100 and 200: " + random(100, 200));
    }
}

Output

Random numbers in range example

Random number between 10 and 20: 14

Random number between 100 and 200: 156

Running the application multiple times you can see that the number will change.

References

• SecureRandom JavaDoc