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I finished the program and demonstrated it, but I just wanted to say polymorphism is a tough concept to wrap your mind around! There's so many layers to keep track of. Thanks again.

I think I figured it out for the most part but I don't understand why I'm getting a nullpointerexception?

Here is my main and coursegrades



import java.util.Scanner;

public class...

I am supposed to be writing a CourseGrades class which helps store a set of four grades in an array. We are given a couple of pre-written files, but I need to write the CourseGrades class and...