Your instructor may assign one or more of the following problems.

1. Design and build a class hierarchy for media types. Your hierarchy should support Books, Periodicals, DVDs and CDs. Some attributes for these kinds of objects include: title, author, ISBN number, subject, running time, volume number, rating, and lending length. Store each of these attributes in the appropriate place in the hierarchy and override the __str__() method of each class in an appropriate manner.

   Write a program that creates a list of media types and uses that to demonstrate the correctness of your design and implementation. One way to do this would be to write a separate driver module that imports your media classes and then does the following:

   • Create a list that stores a variety of media objects. You can just hard-code this as you did with the Question objects in the lab exercise or you can create a simple command-line interface that allows the user to choose the media types to create.
   • Loop through that list, printing out the text representation of each of the media objects.

   Because there is so little functionality required for these classes, you don’t need to implement formal unit tests for this assignment.

Checking In

Submit all appropriate files for grading, including code files, screen captures, supplemental files (e.g., image files), and text files. We will grade this exercise according to the following criteria:

• Correctness:
  • 25% - Basic functionality - Include one basic class encapsulating instance variables, constructors, accessors and mutators.
  • 30% - Inheritance - Get the required inheritance working properly.
  • 30% - Polymorphism - Get the required polymorphic behavior working properly.
• Understandability:
  • 5% - Code Documentation - Separate the logical blocks of your program with useful comments and white space.
  • 5% - Header Documentation - Document the basic purpose, authors and assignment number for your main class and unit test class.
  • 5% - Method Documentation - Each method should have appropriate documentation.