A Level Computer Science: Object-oriented Techniques
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All Computer Science topics are covered, and each module comes complete with:
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Frequently Asked Questions
What is the main purpose of encapsulation in object-oriented programming?
The main purpose of encapsulation is to bundle data (attributes) and the methods (functions) that operate on that data within a single unit (class). It restricts direct access to the internal components of an object, promoting information hiding, modularity, and improved code organization.
How does inheritance contribute to code reuse in object-oriented programming?
Inheritance allows a class (subclass/derived class) to inherit attributes and methods from another class (superclass/base class). This promotes code reuse by enabling the creation of specialized classes that inherit the common functionalities of a base class, reducing redundancy and enhancing maintainability.
What is polymorphism, and how does it enhance flexibility in object-oriented programming?
Polymorphism allows objects of different classes to be treated as objects of a common base class. It enhances flexibility by enabling the use of common methods on objects of different types. Polymorphism can be achieved through method overloading (compile-time) and method overriding (runtime).
How does abstraction simplify software design in object-oriented programming?
Abstraction simplifies software design by focusing on essential properties and hiding unnecessary details. Abstract classes and methods provide a blueprint for common functionalities without specifying the implementation. This allows developers to work at a higher level of abstraction, making the system more manageable and adaptable to changes.
Can you provide an example of how object-oriented techniques model real-world entities?
Consider the modeling of a zoo in object-oriented programming. Classes like "Animal" may have attributes such as "name" and "age" and methods like "eat" and "makeSound." Subclasses like "Lion" and "Elephant" inherit from the "Animal" class, representing specific types of animals with their unique characteristics. This modeling mirrors the hierarchy and characteristics found in a real-world zoo.