Random numbers with Math.random() in Java

Question

For generating random numbers, I've used the formula:

(int)(Math.random() * max) + min

The formula I find on Google always seem to be:

(int)(Math.random() * (max - min) + min)

Which one's right? As far as I know, I've never gotten a number that was out of my range with my formula

Answer 1

Your formula generates numbers between min and min + max.

The one Google found generates numbers between min and max.

Google wins!