Hello friends, I have written several OOP (Object Oriented Programming) concepts tutorials in past and I was thinking to bring them together so that anyone who wants to learn OOP basics can benefit from them easily. In this article, I will share with you my collection of OOP tutorials and OOP concepts interview questions, which will not only help you to understand four pillars of Object-Oriented programming like Abstraction, Encapsulation, Inheritance, and Polymorphism but also powerful design techniques of Aggregation, Association, and Composition, along with SOLID design principles, which are key to write flexible, extensible and object-oriented software.
Top 30 OOP (Object Oriented Programming) Interview Questions Answers in Java
Java is an object-oriented programming language and you will see a lot of object-oriented programming concept questions in Java interviews. The classic questions like the difference between an interface and abstract class are always there but from the last couple of years more sophisticated questions based upon advanced design principles and patterns are also asked to check the OOP knowledge of the candidate. Though, Object-oriented programming questions are more popular on Java interviews for 1 to 3 years experienced programmers.
Top 6 Free Object-Oriented Programming Courses for Java Programmers in 2025 [UPDATED]
The OOP or Object Oriented Programming paradigm allows you to write a program by modeling real-world things in terms of class and object. It makes representing a real-world thing in the programming world smoother and will enable you to manage the complexity of your program. Even though several programming paradigms, like procedural and functional, most of the code we write today is object-oriented. Some of the most popular programming languages are object-oriented, like Java, Python, PHP, and JavaScript, all supported object-oriented programming.
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