Use two different classes

Question

Hi ,thanks a lot for reading this.
I would like to create a java class which can perform addition ,namely this program should return the sum of two integers.
Then another java class should use the previous one in order to add couples of integers.
I know how I should do it if I had the function that performs the addition in the same *.java file but how can I make it work when there are two different files that the one should use the other?
Thanks in advance
Dennis

Answer 1

So you have class someClass that might look like
public class someClass
    public int sum(int a, int b)
         return a+b;
}you'd then have a class otherClass that could use A such as
public class otherClass
     public void foo()
         someClass test = new someClass   //create and instantiate your class with a variable name
         int x = test.sum(5, 2);   //use your variable name to call the method.