Generate random numbers with Math random

With this example we are going to demonstrate how to generate random numbers using random() method of Math Class. The class Math contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions. In short, to generate random numbers you should:

  • Call random() API method of Math. This method returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0. Returned values are chosen pseudorandomly with (approximately) uniform distribution from that range.

Let’s take a look at the code snippet that follows:  

package com.javacodegeeks.snippets.core;

public class GenerateRandomNumbersWithMathRandom {
	public static void main(String[] args) {
		System.out.println("Random numbers between 0.0 and 1.0:");
		for (int i=0; i < 3; i++) {
			System.out.println(Math.random() + " ");
		System.out.println("Random numbers between 1 and 100:");
		for(int i=0; i < 3; i++) {



Random numbers between 0.0 and 1.0:

Random numbers between 0 and 100:

This was an example of how to generate random numbers using random() method of Math Class in Java.

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Byron Kiourtzoglou

Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.
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