Top 35 OOPs Interview Scenarios You’ll Likely Face in 2026

Introduction

OOP (Object-oriented Programming) has gradually gained much popularity as a programming paradigm. Its demand can be partly attributed to the long usage span of OOP languages Java and C#, followed closely by JavaScript, as per a 2023 study. Given its sustained popularity, equipping yourself with the relevant OOP knowledge is essential for landing a technical job.

Get ready to ace your next interview with this detailed compilation of the top 35 OOPs interview questions with answering strategy tips.

Types of Questions to Prepare for OOPs Interview

Choosing the right kind of questions to prepare for an object-oriented programming interview is important for a well-directed approach. The key ones include:

• Fundamental questions
• Language-specific questions
• Advanced questions
• Situational questions

Read More: Java Interview Questions With Real-Time Coding Examples

Fundamental OOPs Interview Questions and Answering Tips

Here are a few top OOPs fresher interview questions and related tips:

 

Q1. Define OOPs.

Answering Tip: Mention its full form, followed by a concise definition.

Q2. Which are the 4 most popular OOP languages?

Answering Tip: Name Java and Python first, as they are more often used than other OOP languages.

Q3. List the features of OOPs.

Answering Tip: Mention all nine features, or at least five.

Q4. Define garbage collection.

Answering Tip: Give its concise definition.

Q5. Name 4 programming paradigms, apart from OOP.

Answering Tip: List the programming paradigms, as required.

Q6. Mention the benefits of OOPs.

Answering Tip: Mention 3-5 main benefits.

Q7. List the types of variables in OOP.

Answering Tip: Mention only the names of OOP variable types.

Q8. Define an object.

Answering Tip: Provide a short, to-the-point definition of an object.

Read More: Types of Variables in Java: Your Guide to Writing Clean, Efficient Code

Language-Specific OOPs Interview Questions and Answering Tips

These questions assess your critical thinking and OOP language-related knowledge base, pertaining to OOPs in Java, Python, and C++.

Some of these important language-specific questions include:

Q1. What is an alternative name for magic methods in Python? Explain its one main use.

Answering Tip: Magic methods are also referred to as dunder methods. Briefly explain its main use—operator overloading.

Q2. In Python, define: (i) a static method, (ii) a class method. Mention 2 differences between them.

Answering Tip: Provide a brief definition of the two and mention the differences between them in terms of key parameters like call, binding, etc.

Q3. How is the diamond problem in multiple inheritance resolved in Java and C++?

Answering Tip: For Java, talk about the use of interfaces to resolve the diamond problem. While for C++, mention virtual inheritance and explain it.

Q4. In C++, list a delegate’s main function.

Answering Tip: Its main function involves the storage and calling of functions indirectly, mainly for event handling or callbacks.

Q5. Explain polymorphism in Java with a real-life example.

Answering Tip: Define polymorphism, and for a real-life example, you can talk about the different organs within a human body, each performing a different function.

Q6. What are decorators used for in Python?

Answering Tip: Mention at least 3-4 uses of decorators in Python. To be on the safe side, you can also practice a code involving decorators.

Q7. How is memory management done in Java?

Answering Tip: Explain how the JVM (Java Virtual Machine) naturally takes care of the memory management in Java.

Q8. Mention 2 ways each of creating and managing threads in Java.

Answering Tip: Here, you can mention the extension of the Thread class and the implementation of the Runnable interface in the methods of thread creation.

For managing threads, you can mention any of the methods like start(), join(), run(), etc.

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Advanced OOPs Interview Questions and Answering Tips

The advanced OOP interview questions are aimed at further gauging your in-depth understanding of OOPs concepts. The key questions under this include:

Q1. Explain the difference between inheritance vs encapsulation.

Answering Tip: Provide at least 2 main differences and briefly explain them.

Q2. Explain the process of exception handling.

Answering Tip: Give an overview of how exception handling is done, while also mentioning its main components.

Q3. What are the drawbacks of OOP?

Answering Tip: Mention 3-5 drawbacks of OOP, focusing on its length, complexity, and difficulty of testing.

Q4. Differentiate between static polymorphism and dynamic polymorphism.

Answering Tip: State the main difference based on when the object type is determined, at compile-time or runtime.

Q5. Define access specifiers and mention their uses.

Answering Tip: Provide a concise definition of access specifiers, followed by 3-5 uses.

Q6. Are there any operators which cannot be overloaded? If yes, name them.

Answering Tip: The answer to this is yes. Mention at least 5 operators as examples.

Q7. In Java, is it possible to run an application without the use of OOP concepts?

Answering Tip: No, it is not. As Java applications are OOP concept-based, it is not possible to implement them without it.

Q8. Is creating objects from a class always necessary?

Answering Tip: No, it is not. Here, mention the two cases about what happens when the base class has static and non-static methods.

Read More: Best 15 Coding Courses for 2026 From Basics to Pro-Level Programes

Situational OOPs Interview Questions

Situational questions in OOPs interviews test your coding knowledge with scenario-based questions. The following questions can be practised for situational coding interview OOPs:

Q1. Is it possible to debug a difficult object-oriented issue? Explain.

Q2. If an existing system requires redesigning, which OOPs would you use? Give reasons.

Q3. How would you detect and resolve circular dependency between objects?

Q4. Explain the process of splitting a class that handles more than one responsibility.

Q5. How would you protect an object’s internal data from being misused by an external code?

Q6. Describe the process of designing a system where users can log in using email or username.

Q7. How to create a calculator that supports different mathematical operations?

Q8. How can sensitive data be protected from unauthorised access?

Q9. How would you ensure object creation only when required?

Q10. How to handle the management of shared data among objects?

Q11. How to ensure that an object consistently behaves properly?

Conclusion

Preparing for your OOPs interview based on your experience level is crucial. Hence, with this suggestive compilation of important questions, you can ensure thorough preparation for acing your interview.
 

For relevant upskilling in this realm, you can explore the certification courses offered by Amity University Online.
 

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