[Belisarius]

That's one of those things in Java I never found out if there was a good way of doing it. It's kinda odd that Integer or Math doesn't have an even/odd method. But even so, this is pretty a basic computer science/math problem, so there are probably a million different ways to do it.

I'm assuming we're working with integers here. The result of any mathematical operation that has a fraction/decimal will have the partial number chopped off, not rounded (good thing in this case). As a result, you can do something like this:

int a = 15;
int b = a \ 2; // Might want to idiot check me on the divide symbol.
if ( (b * 2) == a ){
  // It's even
}else{
  // It's odd
}

The result of this is that b will equal 7, because the .5 gets chopped off. Because 7 * 2 != 15, we know it's odd.