Math.random() - Java

Math.random() is a method in Java that generates a pseudorandom double value between 0.0 and 1.0. It is a part of the java.lang package and can be used in any Java program.

Syntax

The syntax of Math.random() method is as follows:

public static double random()

Usage

// generate a random number between 0.0 and 1.0
double randomValue = Math.random();
System.out.println(randomValue);

The output will be a random double value between 0.0 and 1.0.

Example - Generating a Random Number Between a Range

// use Math.random() to generate a random number between a given range
int min = 1;
int max = 100;
int randomNum = (int) (Math.random() * (max - min + 1)) + min;
System.out.println(randomNum);

This program generates a random integer between 1 and 100.

Explanation

• Math.random() generates a random double value between 0.0 and 1.0.
• To generate a random number within a range, we multiply the result of Math.random() with the difference between the max and min value, add min, and convert the result to an integer using typecasting.

Conclusion

Math.random() is a useful method in Java for generating random numbers. It is easy to use and can be used in various applications, such as generating a random password, generating a random name, or creating random data for testing purposes.