. For example, if you want to get the random numbers between 0 to 20, the the returned value has to be multiplied by 20 to get the desired result. Lets look at the simple example to understand this concept:
MathRandomExample.java
package javabeat.net.util; public class MathRandomExample { public static void main(String[] args) { double x = Math.random(); double y = Math.random(); System.out.println("Random Number 1 : " + x); System.out.println("Random Number 2 : " + x); //Get the random number between 1-30 x = Math.random()*30; System.out.println("Random Number between 0 - 30 : " + x); //Convert to Integer int xInt = (int)(Math.random()*30); System.out.println("Random Number between 0 - 30 (Integer) : " + xInt); //Random numbet between 5-15 xInt = 5 + (int)(Math.random()*10); System.out.println("Random Number between 5 - 15 (Integer) : " + xInt); } }
Output…
Random Number 1 : 0.7050742837772005 Random Number 2 : 0.7050742837772005 Random Number between 0 - 30 : 9.97783862360115 Random Number between 0 - 30 (Integer) : 20 Random Number between 5 - 15 (Integer) : 13
If you look at the above code, Math.random() method generates the random number between 0-1. The next lines used that result and got the desired range of values like 0-30 and 5-15. I hope this example helps you to understand how to use the Math.random() utility method.
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