Definition and Purpose
Conceptual Overview
Class: blueprint for objects. Defines data structure and behavior. Purpose: encapsulate related properties and methods. Enables modular, reusable code.
Role in OOP
Basis for object instantiation. Supports abstraction and encapsulation. Facilitates inheritance and polymorphism. Organizes code logically.
Historical Context
Introduced by Simula in 1960s. Popularized by Smalltalk and C++. Foundation of modern OOP languages like Java, Python, C#.
"Classes are the fundamental templates from which everything in object-oriented programming is constructed." -- Bjarne Stroustrup
Structure and Components
Class Declaration
Syntax varies by language. Contains keyword 'class', identifiers, body enclosed in braces or indentation. Example: class MyClass { ... }
Members
Attributes (fields): hold state data. Methods: define behavior and functionality. Access specifiers: public, private, protected control visibility.
Nesting and Inner Classes
Classes may contain nested classes. Promote encapsulation and logical grouping. Inner classes can access outer class members.
| Component | Description |
|---|---|
| Attributes | Variables holding object state |
| Methods |