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Why am I getting this error "class DuplicateItemException is public, should be declared in a file named DuplicateItemException.java", when I try to compile? Can anyone help me through this?

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    Because you didn't do what the error told you to do? If you want help, you will have to tell us why you think you don't deserve this messsage; is your class in a file with that name? Commented Sep 21, 2014 at 17:41

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Java convention is that a class is placed in a file with the same name of the class, so I assume your class DuplicateItemException is not placed in a file named DuplicateItemException.java.

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Well, not "convention." It's a requirement. But, yes this.

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