This document contains detailed notes from Lecture 3 of the CO2401 course on Software Development. The lecture builds on previous concepts of CRC cards and class diagrams, focusing on key software development principles such as abstraction, modularity, coupling, and cohesion within the context of o...
Recap: CRC Cards and Class Diagrams
1. CRC Cards Overview
o CRC Cards (Class Responsibility Collaborator) are used to
determine the overall system architecture by describing each class
on a card:
Class Name
Responsibilities: Things the class knows and does.
Collaborators: Other classes that interact with this class.
2. Class Diagrams
o Class diagrams show the structure and relationships of classes in a
system, providing a visual representation of objects, their
behaviours, and attributes.
3. Class Relationships
o Multiplicity: Indicates the number of instances in a class
relationship (e.g., "1", "0..*", "n").
o Composition, Aggregation, Association, Inheritance: These
relationships define how classes interact and depend on each other.
Key Software Development Concepts
1. Abstraction
o Abstraction: Using the right level of detail by hiding irrelevant
details to simplify the system.
o Example: A person object may not need a hairColor attribute if it is
irrelevant to the application.
2. Modularity
o Modularity: Structuring a system into interacting components
(modules), allowing easier management and potential reuse of
code.
o Example: Dividing a complex system into simpler, manageable
modules.
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