Modify the AddressBook class to allow the programmer to access all Person objects in the address book. Make this modification by adding two methods: getFirstPerson and getNextPerson. The getFirstPerson method returns the first Person object in the book. The getNextPerson method returns the next Person object if there is one. If there is no next person in the book, getNextPerson returns null. The getFirstPerson method must be called before the getNextPerson method is called.
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