math.random always give 0 result

Question

I am using Ubuntu 14.04.3 LTS and I am studying Java from the book. I tried to follow one example on the book with Ubuntu Terminal and I\'m using Sublime Text. Here is the code

Answer 1

The Math.random() method returns a random double that is from 0 (inclusive) to 1 (exclusive). Performing % 10 doesn't affect this value, but casting it to an int truncates any decimal portion, always yielding 0.

If you want a random number from 0-9, you can multiply Math.random() by 10, instead of taking the remainder when divided by 10.

Alternatively, you can create a java.util.Random object and call nextInt(10).