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. 

Declaration of Java Math random()

Below is the declaration of java.lang.Math.random() method is mentioned below:

public static double random()

Return Type

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

Java Math random() Method with Examples

The Math.random() method is often used for generating random values in Java.

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

// Java program to demonstrate working
// of java.lang.Math.random() method
import java.lang.Math;

// Driver Class
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);
    }
}

// Java program to demonstrate working

// of java.lang.Math.random() method

import java.lang.Math;

​

// Driver Class

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 the working of java.lang.Math.random() method. 

Now to get random integer numbers from a given fixed range, we take a min and max variable to define the range for our random numbers, both min and max are inclusive in the range.

// 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);
        }
    }
}

// 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:

6
8
10
10
5
3
6
10
4
2