Interfaces - Abstract Class - Multimedia - HTML - IPromotion Interface - Web Design Assessment Answer

Interfaces - Abstract Class - Multimedia - HTML - IPromotion Interface - Web Design Assessment Answer

Assessment Task:

Your application should have an Item abstract class which should be extended by the Book and Multimedia classes. Item class has abstract priceAfterTax method, you need to implement this method i derived classes. Multimedia class is a superclass for Music and Movie classes. Your project should also include the IPromotion interface, which should be implemented by Book and Movie classes. Also, your application should have the Lookup class (which is provided in part in this document). Lookup class works as the datastore: it contains all the various items available - books, movies, music items - as well as the list of users. In your main class you should initiate a lookup object in the main method. You also need to include a User class which has the fields and the methods shown for that class in the class diagram. User class has a library of items; once a user downloads or purchases any item, you should add this item to that user’s library. If the user just plays music or watches a movie you should not addthis item to the user’s library.

Objectives
• Reviewing Inheritance
• Reviewing Polymorphism
• Reviewing Interfaces

Problem Specification
Develop a Java application that implements an application for a store chain that has three types of stores which are Book, Music, and Movie stores. The following UML class diagram shows how your application should be created (it shows the relationships between the various classes and interfaces).

Coding Standards
You must adhere to all conventions in the CS 1120 Java coding standards (available on Elearning for your Lab). This includes the use of white spaces and indentations for readability, and the use of comments to explain the meaning of various methods and attributes. Be sure to follow the conventions also for naming classes, variables, method parameters and methods.

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