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Then I learned a different Java so don't know how to help. Don't despair. Someone who learned the Java your instructor is teaching should come by.

Cross posting is allowed, but it's asked to be...

I should have studied your code before asking rhetorical questions. Your Circle class (and probably others) demonstrates that your understanding of classes, objects, and mutators/accessor methods is...

That's what getter (or accessor) methods are for to pull the value or setter (mutator) methods to push the value. Getters and setters provide a communication path or an interface between classes. ...