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It depends on the program flow. If you can get the Customer object which you are attempting to change, you can just invoke the Customer class's methods on the object you retrieve, based on what you...

Sounds correct. Just a list or something of Accounts in the Customer class.
Tell me if what I said earlier doesn't make sense. I kind of rushed through it when I typed it.

How does Customer and Account interact?

Also, it is not necessary to have AccountType when you have different classes for each account type. You can do it that way, but it is not necessary. If you...