If you're in an IBM program, you probably have no choice but to complete their requirements. I'd urge you to obtain some extra help, probably in the form of tutoring, to help you deal with the areas where you say you're having trouble. These are all fundamental programming language constructs that any language will usually implement, and that Java supports in its own form and fashion. You must know this stuff to program in just about any language, in fact, even though syntax and implementation details will vary wildly. Thus, I don't think you can forgo these topics, and that you should get some help and work your way through this essential subject matter.
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