Java Math.random() Method with Examples

by Online Tutorials Library July 22, 2022

Java Math.random() method

The java.lang.Math.random() is used to return a pseudorandom double type number greater than or equal to 0.0 and less than 1.0. The default random number always generated between 0 and 1.

If you want to specific range of values, you have to multiply the returned value with the magnitude of the range. For example, if you want to get the random number between 0 to 20, the resultant address has to be multiplied by 20 to get the desired result.

Syntax

Return

  It returns a pseudorandom double value greater than or equal to 0.0 and less than 1.0.  

Example 1

  public class RandomExample1  {      public static void main(String[] args)       {          // generate random number          double a = Math.random();          double b = Math.random();          // Output is different every time this code is executed            System.out.println(a);          System.out.println(b);      }  }  

Test it Now

Output:

0.2594036953954201  0.08875674000436018

Example 2

  public class RandomExample2  {      public static void main(String[] args)       {          // Generate random number between 0 to 20          double a = Math.random() * 20;          double b = Math.random() * 20;          // Output is different every time this code is executed            System.out.println(a);          System.out.println(b);      }  }  

Test it Now

Output:

19.09244621979338  14.762266967495655

Example 3

  public class RandomExample3  {      public static void main(String[] args)       {          // Generate random number between 5 to 30          double a = 5 + (Math.random() * 30);          double b = 5 +  (Math.random() * 30);          // Output is different every time this code is executed            System.out.println(a);          System.out.println(b);      }  }  

Test it Now

Output:

21.30953881801222  29.762919341853877

Next TopicJava Math

Java Math.random() Method with Examples

Java Math.random() method

Syntax

Return

Example 1

Example 2

Example 3

Java Math.negateExact() Method with Examples

Java Short floatValue() method with Examples

You may also like