Question 1

What are the four main principles of Object-Oriented Programming?

Accepted Answer

The four main principles of OOP are Encapsulation, Inheritance, Polymorphism, and Abstraction. These principles help in creating modular, reusable, and maintainable code.

Question 2

What is the difference between an abstract class and an interface?

Accepted Answer

An abstract class can have both abstract and concrete methods and can have instance variables. An interface can only have abstract methods (in most languages) and cannot have instance variables. A class can implement multiple interfaces but can only inherit from one abstract class.

Object-Oriented Programming (OOP) Interview Questions

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