Help with java program?

Hi, I'm taking a java class, and they're just getting us to review now. Unfortunately since I haven't used java in a while, I'm having a bit of an issue.
I need to write a few classes, link them together just basic java stuff. I'm getting a null pointer exception though, and I can't quite figure out how to fix it. Is there a chance anybody would be able to give me a hand?
https://www.dropbox.com/s/1vd4ad76g0ybg … p.zip?dl=1

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