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Glad to hear you finished your project!
Before long, polymorphism will just feel natural in your code..
Keeping track of the many layers as your projects get bigger and bigger will remain easy, as...

java.lang.NullPointerException is saying you are trying to read a variable that has not been initialized.
If you read the error output closely it will tell you which variable and when.
Hope that...

Sure, your answer is in your question.



Sounds good to me.
-edit- By "good" I mean, correct, you can not store a double in a slot for an object.


Is there another way to access the value...