Top 25+ OOPS Interview Questions for Experienced Programmers

If you're preparing for software engineering interviews, knowing the fundamentals of Object Oriented Programming is essential for solving coding and programming problems. As much as it is important to understand how to leverage OOP concepts in problem-solving, knowing answers to theoretical questions is key too. Expect to be asked many OOPS interview questions for experienced professionals, especially if you're applying for a senior developer or programmer position.

To help you prepare for your upcoming senior developer interview, we’ve compiled a list of the top OOP interview questions for experienced professionals.

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Let’s go ahead and look at some commonly-asked OOPs interview questions for experienced professionals.

Here’s what we’ll cover in this article:

• Top OOPS Interview Questions and Answers for Experienced Professionals
• OOPS Interview Questions for Experienced Programmers for Practice
• FAQs on OOPS Interview Questions for Experienced Programmers

Top OOPS Interview Questions and Answers for Experienced Professionals

Knowing answers to commonly asked OOPS interview questions for experienced professionals is important to ace technical interviews.

In this section, we’ll look at some commonly-asked OOPS interview questions and answers for experienced professionals.

Q1. What are the biggest benefits/advantages of using Object-Oriented Programming?

This is one of the most common OOPS interview questions for experienced developers.

Some noteworthy benefits of using Object-Oriented Programming include:

• OOP allows code to be reused through its feature of inheritance, thereby eliminating code redundancies.
• The OOP model offers complete clarity in programming expression, thereby allowing developers to perform complex programming tasks with simplicity.
• OOP has the feature of data binding, thereby allowing data and information to be kept confidential and private.
• OOP allows data and the code to be bound together through encapsulation, reducing the burden on developers.
• Polymorphism allows code entities to take multiple forms, allowing developers to perform multiple programming tasks simultaneously.

Q2. What do you understand by Polymorphism in Object-Oriented Programming?

Polymorphism is a feature in OOPs where functions, objects, and variables can take multiple forms. This means that classes can have methods and functions of the same name but perform different functions at a given point. There are two types of Polymorphism - Static Polymorphism and Dynamic Polymorphism.

Q3. What is Inheritance in Object-Oriented Programming?

Inheritance is a core Object-Oriented Programming feature where classes can inherit the properties of other classes. This helps developers form associations while coding, helping them eliminate redundancy in code or code blocks.

Q4. What do you understand by Method Overloading in Object-Oriented Programming?

This is one of the most popular OOPS interview questions for experienced programmers.

Method Overloading is a feature that allows methods to be defined by the same name, but perform different functions within the same class, if the arguments passed are different.

Q5.  What is Data Abstraction in Object-Oriented Programming?

Data Abstraction is another core feature in OOPs that allows developers to display only the relevant information to the user and hide the implementation details. Data ABstraction enables data and information to be kept private and confidential, thereby ensuring the security of the program/application.

Go through Java OOPs Interview Questions to crack coding interviews.

OOPS Interview Questions for Experienced Programmers for Practice

To better understand the type of OOPS questions asked at technical interviews for experienced developers, we’ve compiled this list of 20+ sample OOPS interview questions for experienced developers.

1. What are Constructors and Destructors?
2. What do you understand about the Copy Constructor in OOPS?
3. What are subclasses and superclasses in OOPS?
4. What is Hybrid Inheritance in OOPS?
5. Differentiate between the different types of Inheritance in Object-Oriented Programming
6. What are the main advantages of Data Abstraction in OOPS?
7. What are some limitations of Inheritance in OOPS?
8. Explain Method Overriding in OOPS.
9. What is Operator Overloading? Explain with an example.
10. What are access specifiers?
11. What is an abstract class?
12. What are virtual functions in OOPs?
13. Explain the differences between Interfaces and Abstract Classes.
14. Explain Exception handling with an example.
15. Explain the try-catch block with an example.
16. Why is the Finalize method used in OO programming?
17. What do you understand about Garbage Collectors in OOPs?
18. Explain the various types of Constructors.
19. Explain the differences between the different types of Inheritance in OOPs
20. Explain the different types of Polymorphism with appropriate examples.

Practicing these OOPs interview questions for experienced programmers will stand you in good stead for your next programming or developer interview. You can also practice the top Interview Questions on Java OOPS Concepts and some mock interviews for better prep.

FAQs on OOPS Interview Questions for Experienced Professionals

Q1. What type of interviews requires a strong grasp of OOP fundamentals?

Coding interviews, systems design interviews, and SQL interviews require a strong understanding and grasp of OOP fundamentals.  

Q2. What are the core concepts to prepare to answer OOPS interview questions for experienced professionals?

The core concepts to prepare to answer OOPs interview questions for experienced professionals include - Polymorphism, Encapsulation, Abstraction, and Inheritance.

Q3. Are OOPS interview questions for experienced people asked at Java developer interviews?

As Java is an object-oriented programming language, you can expect OOPs interview questions for experienced professionals at senior Java developer interviews.

Q4. Do you need strong OOPs fundamentals to answer coding questions on core data structures and algorithms?

Technical interviews at FAANG+ companies require you to be good at at least one Object Oriented Programming Language to solve coding problems. Hence, it is important to have a stronghold of OOPs fundamentals to solve coding problems on data structures and algorithms at software engineering interviews.

Q5. Which are some programming languages based on the Object-Oriented Programming model?

Some programming languages based on the OOP model include - C++, JavaScript, Python, Scala, Java, and Ruby.

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