Question 1

What is a class in OOP?

Accepted Answer

A blueprint or template for creating objects. A class is a blueprint that defines properties (attributes) and behaviors (methods) that its objects will have. Objects are instances created from classes.

Question 2

What is encapsulation in OOP?

Accepted Answer

Bundling data and methods together while restricting direct access to internal state. Encapsulation bundles data (fields) and the methods that operate on them into one unit (class), controlling access via private/public modifiers.

Question 3

What is inheritance in OOP?

Accepted Answer

A child class acquiring properties and behaviors from a parent class. Inheritance allows a subclass to reuse the properties and methods of a superclass, enabling code reuse and hierarchical 'is-a' relationships.

Question 4

What is polymorphism in OOP?

Accepted Answer

The ability of different objects to respond to the same interface in different ways. Polymorphism means 'many forms.' A single method call can behave differently depending on the actual object type — enabling flexible, extensible code.

Question 5

What is a constructor?

Accepted Answer

A special method called automatically when an object is created. A constructor initializes an object upon creation. It has the same name as the class and sets up the object's initial state.

OOP Concepts — Campus Interview Questions

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