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What is Object-Oriented Programming (OOP)? | Interview Question | TechyTalkWithDev

Core Java Interview Questions

253 Questions

What is Object-Oriented Programming (OOP)?

What are the four pillars of OOP?

What is a class and what is an object in Java?

What is encapsulation in Java?

What is inheritance in Java?

What types of inheritance does Java support?

Why doesn't Java support multiple inheritance with classes?

What is polymorphism in Java?

What is method overloading in Java?

What is method overriding in Java?

What is the difference between method overloading and method overriding?

What is abstraction in Java?

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

Can an interface have method implementations in Java?

What is a constructor in Java? What types of constructors are there?

What is constructor overloading in Java?

What is the `this` keyword used for in Java?

What is the `super` keyword used for in Java?

What is the difference between composition and inheritance in Java?

What is the difference between a class and an interface in Java?

Interview questions

Question 19 of 253

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What is Object-Oriented Programming (OOP)?

OOP Concepts

OOP is a programming paradigm that models software around 'objects' — bundles of state (fields) and behavior (methods) — rather than around functions and logic alone. Java is fundamentally object-oriented: almost everything except primitives is an object.

Beginner3 min

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#OOP#Fundamentals

What is Object-Oriented Programming (OOP)?

Why OOP

OOP encourages modeling real-world entities as objects, which improves code reusability, modularity, and maintainability — large systems become easier to reason about as collections of interacting, well-encapsulated objects rather than one long procedural script.

Procedural: functions operate on separate data · OOP: objects bundle data + behavior together

Procedural: functions operate on separate data · OOP: objects bundle data + behavior together