How many ways we have through which we can generate the Random Numbers in Selenium Java?

 There are 3 ways we have through which we can generate the Random numbers.

1. Java.util.Random class

2. Math.Random method

3. ThreadLocalRandom class

Now we will see that how we can implement the above 3 ways to generate the Random numbers.

Java.util.Random class

To generate the Random number with this way, first we need to create an object of this class like below 

Random rnd=new Random();

To use the above class you need to import the below jar in your project.

import java.util.Random;

Now, we need to see what type of Random number we need to generate like Integer, Long, Boolean, Float & Double etc.

There are methods which we can call through the object of Random class like below

rnd.nextInt(100) // This will generate the Random Number between 0 to 100.

rnd.nextFloat()

rnd.nextLong()

rnd.nextDouble()

rnd.nextBoolean();

import java.util.Random;
public class Numbers
{
    public static void main(String args[])
    {
        Random rnd=new Random();        
        System.out.println(rnd.nextInt()); //Output 1579708416        
        System.out.println(rnd.nextInt(100));//Output 36
        System.out.println(rnd.nextLong()); //output -3975729109407067933
        System.out.println(rnd.nextFloat()); //output 0.22997051
        System.out.println(rnd.nextDouble()); //output 0.7115380145242618
        System.out.println(rnd.nextBoolean());//output true
    }
}

Math.Random method

This method will generate the Random number of type Double between the range of 0.0 to 1.0 . 

import java.util.Random;
public class Numbers
{
    public static void main(String args[])
    {
        System.out.println("Random value :"+ Math.random()); 
        //Output "Random value :0.9302772707882316"
    }
}

ThreadLocalRandom class
This class got introduced in Java 1.7 for generating the Random Numbers of type Integer, Float , double, boolean etc. Please find the below example 
import java.util.concurrent.ThreadLocalRandom;
public class Numbers
{
    public static void main(String args[])
    {

        System.out.println("Random value :"+ ThreadLocalRandom.current().nextInt());
        System.out.println("Random value :"+ ThreadLocalRandom.current().nextInt(1,10));
        System.out.println("Random value :"+ ThreadLocalRandom.current().nextInt(100));
        //"Random value :-1778537131
        //Random value :6
        //Random value :37"
    }
}
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I will be adding more concepts in my upcoming posts. Please keep me posted if you have any questions and concerns.



Best of Luck.