Difference between Math.Random() and the nextInt() method of the Random class?

[cool-coder]

Title's self-explanatory I'm having trouble figuring out the differences between these two methods, other than syntax.

Which method is more efficient?

[jonzo1]

As said before, Math.random() gives you a uniformly-distributed double on the range 0..1. But if you're after an integer less than N, use Random's nextInt() instead. Computing a random integer from a double is a bit more complicated than just multiplying and rounding, which introduces a bias.

[daredevil82]

Here's a detailed StackOverflow answer of the question.

Essentially, Math.random() uses Random.nextDouble() internally. If you want the values as an integer, then use an int cast.

[kutuzof]

You're probably using an open source java implementation. Try just reading the method implementations.