Question at position 14 Consider the design of a system used to track and manage the items in a library. From discussions with librarians and other stakeholders you identified the following possible classes and fields. Book Fields of the Book class: library ID, name, description, data of acquisition, status, title, ISBN, category, authors, publisher, publication date DVD Fields of the DVD class: library ID, name, description, data of acquisition, status, title, actors, directors, genre, rating, length Recognizing that Books, DVDs, and other forms of library media all contain similar pieces of data/information that must be tracked and managed, you decide to create a Media class (see below) and use inheritance since it improves code re-usability. Media Fields of the Media class: library ID, name, description, data of acquisition, status Which would be the most appropriate way to utilize inheritance within your UML design?Media, Book, and Movie each as standalone class (not related by inheritance)Media as a superclass, with Book and Movie as subclasses of MediaMovie as a superclass, with Book as a subclass of Movie, and Media as a standalone classBook as a superclass, with Movie as a subclass of Book, and Media as a standalone classSingle choice
A
Media, Book, and Movie each as standalone class (not related by inheritance)
B
Media as a superclass, with Book and Movie as subclasses of Media
C
Movie as a superclass, with Book as a subclass of Movie, and Media as a standalone class
D
Book as a superclass, with Movie as a subclass of Book, and Media as a standalone class

Question

Question at position 14 Consider the design of a system used to track and manage the items in a library. From discussions with librarians and other stakeholders you identified the following possible classes and fields. Book Fields of the Book class: library ID, name, description, data of acquisition, status, title, ISBN, category, authors, publisher, publication date DVD Fields of the DVD class: library ID, name, description, data of acquisition, status, title, actors, directors, genre, rating, length Recognizing that Books, DVDs, and other forms of library media all contain similar pieces of data/information that must be tracked and managed, you decide to create a Media class (see below) and use inheritance since it improves code re-usability. Media Fields of the Media class: library ID, name, description, data of acquisition, status Which would be the most appropriate way to utilize inheritance within your UML design?Media, Book, and Movie each as standalone class (not related by inheritance)Media as a superclass, with Book and Movie as subclasses of MediaMovie as a superclass, with Book as a subclass of Movie, and Media as a standalone classBook as a superclass, with Movie as a subclass of Book, and Media as a standalone classSingle choice

A

Media, Book, and Movie each as standalone class (not related by inheritance)

B

Media as a superclass, with Book and Movie as subclasses of Media

C

Movie as a superclass, with Book as a subclass of Movie, and Media as a standalone class

D

Book as a superclass, with Movie as a subclass of Book, and Media as a standalone class

BlackTom AI · Accepted Answer

First, restating the problem: You are designing a UML for library items and have a Media class with common fields (library ID, name, description, data of acquisition, status) and specialized classes Book and DVD/ Movie with additional fields. The question asks which inheritance arrangement best captures the shared data while allowing specialization.
Option 1: "Media, Book, and Movie each as standalone class (not related by inheritance)". This ignores the identified common fields that should be factored into a shared base class. Since Book and Movie (and other media) share several attributes, having them completely separate misses the opportunity for code reuse and consistency, and it’s not leveraging the stated design goal of inheritance to reduce duplication.
Option 2: "Media as a superclass, with Book and Movie as subclasses of Media". This aligns with the idea that Book and Movie (or DVD/Video) share common metadata captured by Media. The subclass adds specific fields such as authors, publisher, ISBN for Book, or actors, directors, genre, rating, length for Movie, while reusing the common fields from Media. This structure supports polymorphism and extensibility (e.g., adding other media types later) and avoids duplication of the shared attributes.
Option 3: "Movie as a superclass, with Book as a subclass of Movie, and Media as a standalone class". This is illogical because books and movies are both media types; having Movie as the superclass would force Book to inherit from a more specific and incompatible abstraction. It also leaves Media unconnected, failing to capture the common data across all media types.
Option 4: "Book as a superclass, with Movie as a subclass of Book, and Media as a standalone class". Similar to Option 3, this misplaces inheritance by making a literary format (Book) the parent of another media type (Movie). It misrepresents domain knowledge and would complicate the model, since both should share a common base rather than one being derived from the other. Additionally, Media being standalone contradicts the shared fields already mentioned.
In summary, the most coherent and scalable approach is to place the shared attributes in a single Media base class and derive Book and Movie (or DVD) from it, enabling shared behavior and fields while allowing each subclass to extend with its own specific properties. The remaining options either duplicate data, misrepresent the relationships between media types, or break the principle of using a common base for shared attributes.

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