Primitive Data Type as Objects (int, long, bool, float, char, etc.) Furthermore, Java language is not a Pure OOP language as it contains the following properties: Java supports properties 1, 2, 3, 4, and 6 but not properties 5 and 7. ![]() Pure OOPs languages do not support primitive types.Ī pure object-oriented language must also satisfy the following requirements:Īll 4 OOP concepts: Encapsulation, Inheritance, Abstraction, and Polymorphism.Īll operations on objects must be performed only through methods exposed to the objects. If a programming language treats every program element as an object, it is said to be pure object-oriented. If you're looking to hire Java developers, too, these questions can be a great reference for tests. So in this article, we will look at some popular Java OOP interview questions to help you ace your next interview. It also makes sense because these programmers must understand OOP fundamentals such as Abstraction, Inheritance, Composition, Class, Object, Interface, Encapsulation, and so on. Object-oriented programming questions, on the other hand, are more common in Java interviews for programmers with 1 to 3 years of experience. Still, more sophisticated questions based on advanced design principles and patterns have been asked in recent years to assess the candidate's OOP knowledge. The classic questions, such as the difference between an interface and an abstract class, are always present. Java is an object-oriented programming language, and object-oriented programming concept questions will be common in Java interviews. 22 Essential Java OOPs Interview Questions
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