Java Random Tutorial (Math.random() vs Random Class nextInt() nextDouble() )

Random numbers are a common part of many programs and games. (Yeah I know they're not truly "random" but pesudorandom numbers are the best computer can do)
There are 2 main ways: Using a static method of the built-in Math class, or creating a Random object & calling methods on that object

-Not very useful on its own, but the result it can be multiplied to give a "range" of number
-The upper bound is always excluded so you'd need to add 1 to get an inclusive range

int min = 5;
int max = 15;
int range = max - min +1;

-Range must be 1 greater than the range you want since the upper bound will always be excluded
-This will give you the desired result
-Negative values for min & max still work as long as you still add 1 to the range
-Getting decimals just involves removing the (int) casting
-You might want to round off the numbers to only display a few decimals

➣Random class
-Random generator = new Random();
-Creates a new Random object with reference variable "generator"
-You can now use the formula like this:
(int)(generator .nextDouble()*range ) +min
-But you can also use get an integer in a specific range
-The formula can now be used like this

[ohnoitsaj]

The nice fast explanations are excellent, no fucking around with shitty opening scenes and introductions. Thank for the clear and concise explanations

[thoughte]

To the point + explained it fast without making it harder to comprehend what's going on. Perfect.

[srinivasnangunuri]

I paused at 1:12 to like this video . Great help. Thanks

[paolobena]

That is a great tutorial
I apreciated the "League legends caster" voice speed

[sheonajoseph]

omg yes finally a video that does not beat around the bush and actually gets to the point THANK YOU brilliant

[shreyas-sfeu]

How to generate exact next appearing 5 random numbers
Please answer Sirr

[MD-socz]

thank you for this video, this helps me so much for my crrent problem

[mathiascronqvist]

Using Math.random on your example, can you generate an output sorted from lowest to highest?

[deanlgj]

Hi, so what are the differences between the two methods in terms of pros and cons?

[FoodImitatingArt]

Hey bro nice vid. Do you know how to calculate random numbers?

[XOPGAMINGX]

what is better ? the Random class or the function random from the Math class?

[hkena]

great but if i want to get numbers without repeat and full from between 1-8 ? look like {6, 4, 1, 2, 8, 5, 7, 3} ?

[wajahatghumman]

Man your voice is so funny and amazing just slow it down a bit please.

[Supashotzz]

What if i wanna use numbers between 5000 and

[DanielBelini]

I did something wrong, because I can't generate more than ONE number with a System.out.println.
I had to put 6 to generate 6 numbers.
Here's my code

package desafio;

import java.util.Random;

public class Megasena {
public static void main(String[] args) {

Random dezenas=new Random () ;
for (int i = 0; i<1; i++) {

}








}
}

[keithwallace]

ok ok
i opened this video to hear that "Random class is 2 times faster than Math.random() method"
but you just explained both of them and nothing more, which is disappointing :|
anyway, nice video +

[ali.darwish]

haha, you were probably not in hurry while making this video.

[jenniferlacaste]

Turn the speed to 0.5x. Thank me later.

[elizabethhayes]

Stop gabbling - slow down and articulate.