CPP Object-Oriented Programming Concepts

Question 1

Which OOP principle allows a subclass to provide a specific implementation of a method already defined in its superclass?

Accepted Answer

Polymorphism

Answer

Polymorphism allows subclasses to override superclass methods, enabling different behaviors through the same interface.

Question 2

What does the 'encapsulation' principle primarily aim to achieve in OOP?

Accepted Answer

Hiding internal state and requiring all interaction through methods

Answer

Encapsulation bundles data and methods while restricting direct access to an object's internal state.

Question 3

In object-oriented design, what is an abstract class?

Accepted Answer

A class that cannot be instantiated and may contain abstract methods

Answer

An abstract class cannot be instantiated directly and is meant to be subclassed, often containing abstract method declarations.

Question 4

Which concept describes a class implementing more than one interface in Java or C#?

Accepted Answer

Multiple interface implementation

Answer

Java and C# allow a single class to implement multiple interfaces, providing multiple type contracts without multiple class inheritance.

Question 5

What is the difference between method overloading and method overriding?

Accepted Answer

Overloading defines multiple methods with the same name but different signatures; overriding redefines a superclass method in a subclass

Answer

Overloading uses the same method name with different parameter lists in the same class, while overriding redefines an inherited method in a subclass.

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