Modular Math in Java (Number Line which Wraps Around)

Question

I am trying to create a simple function that utilizes modular arithmetic. This is essentially a number line that wraps around. Specifically I want to use a Mod 8 number line in Java.

What I want is to compare two numbers between 0 and 7. I want to subtract these numbers to get a difference score. However, instead of 0-7=-7, I want it to equal 1. The idea being that after you reach 7, the number line wraps around back to 0 (therefore 0 and 7 are only one space across.)

Are there any packages that fit this criterion?

Answer 1

how about ((0-7)+8) % 8 ? This should fix up your case.

Note: % is the Modular operator.