A Personal Address Book application program allows the user to add,.pdf

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A "Personal Address Book" application program allows the user to add, delete, search, save and load her contact information. The program separates user (command-line) interface and internal processing subsystem. The internal processing system consists of the following classes: ContactManager (responsible for add and delete operations), ContactFinder (responsible for search operation), and DataManager (responsible for save and load operations). 1-Explain how you will design the user interface using the Facade pattern? Illustrate your answer using class diagram for the entire system. 2- Draw an UML sequence diagram to show the behavioural view of the personal address book program that demonstrates what happens when a user enter a new contact information..

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