10 Questions
What does the method PointIsAt() do?
Checks if a point is at the object
What is the primary purpose of Generalization in object-oriented programming?
Creating parent classes for code reuse
Why does Composition allow for including multiple copies of a type of object inside a class?
To enable code reuse
What does a relational database store data in?
Tables
Which type of database is the most popular?
Relational database
What is the main purpose of DATABASE DESIGN?
To produce a detailed data model of a database
Inheritance allows subclasses to _____ properties and behaviors from superclasses.
Inherit
What is the primary difference between Composition and Inheritance?
Inheritance allows subclasses to extend superclasses, while Composition includes objects within objects.
What does a relational database store in records within tables?
Groups of data related by common attributes
What is the purpose of Company Class inheriting from Person Class in object-oriented programming?
To include contact person information in the Company Class
Study Notes
Object-Oriented (OO) Design
- A class defines the general properties and behaviors for a set of objects.
- An instance of a class is an object with the class's type.
- Top classes that the application will use are defined at high-level design.
- Identify main classes by looking for nouns in a description of the application's features.
Hierarchy and Inheritance
- Inheritance supports hierarchical classification and provides code reuse.
- A child class is derived from the parent class, inheriting properties, methods, and events.
- Example: Yaris and Jazz are child classes of Car, inheriting properties, methods, and events.
- Refinement is the process of breaking a parent class into multiple subclasses to capture differences between objects.
Refinement
- Refinement focuses on behavioral differences between classes.
- Refined classes include properties, methods, and events.
- Example: Automatic and Manual classes inherit Acceleration property from Car class.
Generalization
- Generalization extracts common features from two or more classes to define a parent class.
- Example: ClassyDraw Application has classes such as Rectangle, Ellipse, Polygon, Text, Line, Star, and Hypotrochoid.
Low-Level Design
- Low-level design focuses on "how" and defines refined classes including properties, methods, and events.
- Properties define the information the class needs, methods define the actions the class needs to perform, and events define notifications.
Building Inheritance Hierarchies
- Inheritance is a mechanism by which an object acquires properties, methods, and events of another object.
- Generalization creates a parent class, and inheritance builds a hierarchy of subclasses.
Composition
- Composition provides code reuse and allows including multiple copies of a type of object inside a class.
- Example: Company class includes a Person object with FirstName, LastName, Address, and PhoneNumber properties.
Database
- A database is a collection of related information that is organized for easy access, management, and update.
- Database design is the process of producing a detailed data model of a database.
- Relational databases are simple and easy to use, providing tools for searching, combining data, and sorting results.
Explore the concepts of inheritance and refinement in object-oriented programming. Learn how child classes derive properties, methods, and events from a parent class. Understand the process of refinement by breaking a parent class into multiple subclasses to capture differences between objects.
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