Problem
Assume that you have decided to loan DVDs in your DVD collection to friends (see Project 2) but just one DVD at a time to each friend. Assume that you also have a collection of friends. For each friend, you need to store the friend's name and phone number and the number of the DVD your friend has borrowed (-1 if none). Besides managing your DVD collection as in Project 2, you should also be able to manage your list of friends (add friend, edit friend, and so on). One of the edit operations should allow your friend to return a DVD or to exchange it for another. You should also be able to display each friend and the name of the DVD that the friend currently has (if any). Draw UML class diagrams before you start to code the program.