Interview preparation includes researching the company you will be interviewing with, practicing a mock interview, and reviewing frequently asked questions. An interview for an object-oriented programming position is no exception. There are many object oriented interview questions that you may be asked when interviewing for this type of position. In this article, we will provide you with 50 object oriented programming interview questions and some sample answers to help you prepare for the interview.
These questions show your level of understanding of object-oriented programming, or OOP.
- What is Object Oriented Programming (OOP)?
- What are the basic concepts of PPE?
- What is an object?
- What is a class?
- Describe the change among a class and a structure
- What is a constructor?
- What is a destructor?
- What is polymorphism?
- What is heritage?
- What are manipulators?
- What is exception handling?
- What is data abstraction?
- What is a superclass?
- What is a subclass?
- What is encapsulation?
- What is an interface?
Questions about Experience and Background
These questions will help the interviewer learn more about your specific education and experience and whether you are a good fit for the company.
- Where did you go to school?
- What did you do?
- If you have not studied computer science or equivalent education, what experiences do you have that have prepared you for this position?
- What is your highest level of education?
- Have you taken any design courses?
- Do you have experience in software design?
- Do you have software programming experience?
- Which programming languages do you know?
- How many years have you been programming?
- Have you created your own software? Do you have an example?
- How did you use PPE in your last position?
- Describe the moment you changed “no” to “yes”.
In-Detail Interview Questions
These questions require a deeper understanding of object-oriented programming and can help the interviewer understand how you process new information and respond to challenges.
- What are the different types of arguments in OOP?
- Describe the differences between overloading and overriding
- Is it possible to call a base method without creating an instance?
- What is the resolution of the three forms of constructors?
- Can a static method use a non-static member? Why?
- What are the different types of inheritance?
- What are the limitations of inheritance?
- How can you get data abstraction?
- Are you able to instantiate an abstract class? Explain why or why not
- What are virtual functions?
- What are the differences between virtual features and friend features?
- How does design fit into PPE?
- Clarify the variance among multiple and multilevel inheritance
- List and explain several differences between types of inheritance
- How do static and dynamic polymorphism differ?
- Explain the differences between public, private, and protected access modifiers
- What are the advantages of OOP over other types of programming?
Interview Questions with Sample Answers
Following are some common object oriented programming interview questions with tips and sample answers. How you respond is just as important as the content of your response, so be sure to take the time to think about what you want to say before you speak.
Explain what the basic concepts of PPE are.
The answer to this question effectively demonstrates your understanding of OOP as a whole. The interviewer may or may not have programming experience, so your answer should be detailed, but rely on layman’s terms to help the interviewer understand your answer.
Example: “There are four principles of OOP – encapsulation, abstraction, inheritance, and polymorphism. Encapsulation means that an object keeps its state private. Abstraction adds structure and access to objects. Inheritance is the application of shared structures across classes. Polymorphism is the thought that objects, code or operations act contrarily in diverse settings. All these elements work together to create OOP.”
What are the benefits of PPE?
The specific benefits of PPE to the organization you are interviewing with will depend on what they do or do. Tailor your answer to the company you are interviewing with.
Example: “Using OOP has many advantages over other programming styles. For your company, the two main advantages would be simplicity of programming and ease of modification. OOP is simpler than other programming styles because the objects inside the programs are modeled on real-world objects. The configuration of the software package is perfect. OOPs are easy to modify because objects are maintained independently.”
What is polymorphism? Describe how it is supported in your chosen coding language.
You’ve probably already given the interviewer an overview of polymorphism. Use this opportunity to expand on your explanation. Consider the interviewer’s level of coding and programming knowledge before you get too technical in your response.
Example: “Polymorphism can take several different forms, but generally it means that an object, code, or operation will behave differently in different settings. C++ supports compiler-time polymorphism and runtime polymorphism. Compiler-time polymorphism is when the compiler knows which function to use when making a polymorphic call. Runtime polymorphism is when virtual functions are called based on the type of the referenced object.”
Explain the differences between classes and objects.
This question will demonstrate your understanding of OOP as well as your ability to explain concepts clearly and concisely. After the explanation, use an example that applies to the company you are interviewing with.
Example: “A class is a template for an object. An object is an instance of a class. Objects contain information, but classes do not.”
Describe two differences between procedural programming and OOP.
Your answer to this question will demonstrate your general programming knowledge. Tailor your answer to the company you are interviewing for.
Example: “The main difference between procedural programming and object-oriented programming is the basis of the language that each program uses. Procedural programming uses a language based on functions, while object-oriented programming uses a language based on real-world objects.”
What are the limitations of PPE?
How you answer this question will demonstrate not only your awareness of the scope of PPE, but also how you manage limitations in general. Answer clearly but positively.
Example: “It’s key to be attentive of the restrictions of OOP before you program something fresh. OOP is generally not ideal for small problems, but it’s great for large projects. It also requires a lot of planning ahead of time to make sure everything will work after coding properly. Z for this reason it may take longer than procedural programming.”
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