Java Math random() method with Examples

Difficulty Level : Easy
Last Updated : 12 Apr, 2018

The java.lang.Math.random() method returns a pseudorandom double type number greater than or equal to 0.0 and less than 1.0. . When this method is first called, it creates a single new pseudorandom-number generator,
exactly as if by the expression new java.util.Random.

Syntax :

public static double random()

Return :
This method returns a pseudorandom double greater than or equal to 0.0 and less than 1.0.

Example 1 :To show working of java.lang.Math.random() method.

// Java program to demonstrate working
// of java.lang.Math.random() method
import java.lang.Math;
  
class Gfg1 {
  
    // driver code
    public static void main(String args[])
    {
        // Generate random number
        double rand = Math.random();
  
        // Output is different everytime this code is executed
        System.out.println("Random Number:" + rand);
    }
}

Output:

0.5568515217910215

Example 2 :To show working of java.lang.Math.random() method.

// Java program to demonstrate working
// of java.lang.Math.random() method
import java.lang.Math;
  
class Gfg2 {
  
    // driver code
    public static void main(String args[])
    {
        // define the range
        int max = 10;
        int min = 1;
        int range = max - min + 1;
  
        // generate random numbers within 1 to 10
        for (int i = 0; i < 10; i++) {
            int rand = (int)(Math.random() * range) + min;
  
            // Output is different everytime this code is executed
            System.out.println(rand);
        }
    }
}

Output:

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