java - math.random() doesnt create random number

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65643545/math-random-doesnt-create-random-number

Answer 1

(int)Math.random() always returns 0

(int)Math.random() always returns 0 because Math.random() returns a double value from 0 to less than 1 and thus when you cast it, it will always give you 0.

You should cast Math.random() * (max - min + 1) to int as (int) (Math.random() * (max - min + 1)) instead of casting Math.random() to int which gives you 0 and 0 multiplied with anything is 0.

Also, to avoid such a problem, it's always recommended to use Random#nextInt(int bound) e.g.

Random rand = new Random();
int randomX =  rand.nextInt((max - min + 1)) + min;