Java Examples : How To Generate Random Numbers Using Math Class

Intro

This examples, will demonstrates how to generate random numbers using Math class. To generate a random numbers, you can use random() method  of the Math class.

Examples

package com.freesamplecode.java.basic;

public class MathRandomDemo {
 public static void main(String[] args){
  System.out.println("Generate 10 random numbers between 0.1 until 1.0");
  
  for(int i = 0; i < 10; i++){
   System.out.println("Random Number ["+(i+1)+"] : "+Math.random());
  }
  System.out.println("\n");
  
  System.out.println("Generate 10 random numbers between 1 until 100");
  for(int i = 0; i < 10; i++){
   System.out.println("Random Number ["+(i+1)+"] : "+(int)(Math.random()*100));
  }
 }
}

Output

Generate 10 random numbers between 0.1 until 1.0
Random Number [1] : 0.946534944763472
Random Number [2] : 0.3063194944704022
Random Number [3] : 0.9496022177057386
Random Number [4] : 0.9596111956650383
Random Number [5] : 0.036928072409052604
Random Number [6] : 0.8164804967636967
Random Number [7] : 0.9125098736893867
Random Number [8] : 0.1716309366966936
Random Number [9] : 0.3904588638496561
Random Number [10] : 0.34565654910497223


Generate 10 random numbers between 1 until 100
Random Number [1] : 34
Random Number [2] : 93
Random Number [3] : 57
Random Number [4] : 6
Random Number [5] : 92
Random Number [6] : 85
Random Number [7] : 29
Random Number [8] : 13
Random Number [9] : 79
Random Number [10] : 59

Screenshot

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