Define a new checked exception class

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In the address-book-v3t project, define a new checked exception class: Duplicate Key Exception. This should be thrown by the add Details method if either of the non-blank key fields of its actual parameter is already currently in use. The exception class should store details of the offending key(s). Make any further changes to the user interface class that are necessary to catch and report the exception.

Reference no: EM131374474

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