Why can't I call a public method in another class?

Question

I have got these two classes interacting and I am trying to call four different classes from class one for use in class two.

The methods are public and they do return va

Answer 1

You have to create a variable of the type of the class, and set it equal to a new instance of the object first.

GradeBook myGradeBook = new GradeBook();

Then call the method on the obect you just created.

myGradeBook.[method you want called]