Abs - Return New IntClass Object Representing Absolute Value Of Argument

I don't know how to define "abs." Here are the instructions:
 
The purpose of this exercise is to add to the IntClass class below a method, abs, that takes as its only argument an IntClass object and returns a new IntClass object representing the absolute value of the argument.
 
Define the desired method as a class method.
 
Define the desired method as an instance method.
 
In each case, use the main method to test your code.

There's two boxes of editable code. I'm having trouble with the first one, the one with "abs."

Here is more code:

My code goes here
 
}

Here's another box of code that they want me to fill out:
 
public class MainClass
{
public static void main( String[] args )
{
 
My code goes here...