How to generate Random Numbers And Random Strings In Java

How to generate Random Numbers In Java

========================================================================

Approach -1:

==================

import java.util.Random;

public class RandomNumbers {

    public static void main(String[] args) {

        // How to generate Random Numbers Using Apache Commons API

        // Random Class In Java Is Used To Generate Pseudo-Numbers in Java

        // Random Numbers Generate

        Random random = new Random();

        Integer random_Integer = random.nextInt(10000);

        System.out.println("Random Integer:" + random_Integer);

        // Random Double (decimal point numbers) generate

        Double random_double = random.nextDouble();

        // Range from 0.0 to less than 1.0

        System.out.println("Random Double:" + random_double);

        // Using Math Class In Java ...How To generate Random Numbers

        System.out.println("Random Number1:" + Math.random());

    }

}

Approach -2:

===================

Generate Random Numbers And Strings Using Apache Commons Lang-API

Download The Apache Commons Lang API From The below Website:

There is a Jar File Download It and add API into your Classpath

https://commons.apache.org/proper/commons-lang/download_lang.cgi

import org.apache.commons.lang3.RandomStringUtils;

public class RandomStrings {

    public static void main(String[] args) {

        String randomNumber = RandomStringUtils.randomNumeric(5); // Generate Number With 5 Digits

        System.out.println(randomNumber);

        String randomString = RandomStringUtils.randomAlphabetic(5); // Generate Number 5 character String

        System.out.println(randomString);

    }

}

Output:

===========

50542 MbNlg