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Desperately Need Help With Java Programming Assignment

I have attached what I've coded.
But I believe I haven't coded as well as I could have.
I don't know how to use the continue statement I require.
And don't really understand why baseDiameter, baseThickness, and baseRadius won't display in the end when I input certain dimensions for them.
And in some situations I have a NullPointerException and I don't know how to fix that.

I've also attached what my requirements for the assignment is.
Any help would be deeply appreciated. ; u;