Generating a random number between range in Java

What is random number?

A random number is a number that is generated without any predictability or pattern. It is a value that is chosen at random from a set or range of possible values.

Random numbers are commonly used in computer programming for various purposes such as generating unique IDs, simulating random events, and creating randomized content.

It can be generated using various algorithms and techniques, such as pseudorandom number generators that use a mathematical formula to produce seemingly random values or true random number generators that use physical phenomena such as atmospheric noise or radioactive decay to generate truly random values.

In most programming languages(c, c++, Java) , random numbers can be generated using built-in functions or libraries.

How to generate Random Number in Java?

To generate random numbers java users Random class and to generate an integer random number nextInt(maxNo) of Random number is used the parameter maxNo specifies that this method generates a integer number between 0 and maxNo.

import java.util.Random;

public class RandomNumber {

	public static void main(String[] args) {
		
		int maxno=100;
		Random randomNo = new Random();
		int no = randomNo.nextInt(maxno);
		System.out.print("random number  is  :" + no);
	}
}

import java.util.Random;

public class RandomNumber {

public static void main(String[] args) {

int maxno=100;

Random randomNo = new Random();

int no = randomNo.nextInt(maxno);

System.out.print("random number is :" + no);

}

It will generate a random number between 0 and 100, where 0 and 100 are included.

how to generate random numbers in java within range

How to generate random number between 0 and 1 in java?

import java.util.Random;

public class RandomNumber {

	public static void main(String[] args) {
		double randomNum = Math.random();
                System.out.println(randomNum);
	}
}

import java.util.Random;

public class RandomNumber {

public static void main(String[] args) {

double randomNum = Math.random();

System.out.println(randomNum);

}

Java random number between 1000 and 9999

import java.util.Random;

public class RandomNumber {

	public static void main(String[] args) {
		Random random = new Random();
                int randomNum = random.nextInt(9000) + 1000;
                System.out.println(randomNum);

	}
}

import java.util.Random;

public class RandomNumber {

public static void main(String[] args) {

Random random = new Random();

int randomNum = random.nextInt(9000) + 1000;

System.out.println(randomNum);

}

This code creates a new instance of the Random class, which provides methods for generating random values.

It then uses the nextInt() method to generate a random integer between 0 (inclusive) and 9000 (exclusive), and adds 1000 to the result to shift the range to between 1000 and 9999.

The resulting value is then assigned to the variable randomNum, which is printed to the console using System.out.println().

If you want to generate a random number within a specific range, you can use the formula Math.random() * (max - min) + min, where max is the maximum value and min is the minimum value of the range