As soon as you get your Programming job interview call, you should start doing your homework i.e., I mean prepare answers of basic and advanced OOPS Interview questions. This kind of homework will increase your self-confidence during a job interview. Besides, you won't get stuck in any questions whose answers you know, but due to workload or interview stress, you forget all about it; such bad things happen quite often. You can circumvent them, though.

12 OOPS Interview Questions Must Prepare Before Your Job Interview

Never forget that Practice makes a man perfect. So, try to gain that perfection while quickly checking answers to those questions which many job seekers encountered in an OOPS job interview.

1. What is object-oriented programming (OOP)

A software developer uses OOPto to create logical modules. Object-Oriented programming helps them generate an object that represents a class in a program. The data and behavior of a class are some features which are encapsulated in an object. With the mean of this programming language, developers can developer modular programs and combine them in the form of software. To access data and behavior of various software modules, objected are used.

2. What is Destructor?

It is a method used in OOP. If an object is made of scope or destroyed, then this method will be called automatically. The name of the class and the destructor is the same. However, we put the tilde symbol before the name.

3. What is an Inline function

Compiler employs a technique named inline function, which inserts a complete body of the function wherever a programmer used that function in a source code of a program.

4. Can you Define virtual function?

It is a member function of a class. The functionality of this function can be overridden in its derived class. The keyword "virtual" is used to implement this function. Some programmers define that function during the function declaration process. Check more details of Virtual Function in OOP.

5. What is the purpose of a friend function?

It is a friend of a class since it gets access to Public, Private, and Protected data available in that particular class. This access is not granted when a function is defined outside the class. A programmer can declare a Friend function for a class anywhere in the class declaration. This function never gets affected by access control keywords such as protected, private, or public.

Important Tip: I suggest you recall all basic and advanced functions of OOPS because when you do that, then you would be able to quickly answer all kinds of OOPS interview questions as promptly as you can.

6. What do you know about the basic concept of OOPS?

There are four fundamental concepts of OOPS, such as Abstraction, Encapsulation, Inheritance, or Polymorphism.

7. What do you know about Encapsulation?

This attribute of a class contains all the hidden data which is restricted to members of that particular class. Different levels of restrictions are Protected, Public, Internet, Private, and Protected Internal.

Note: Some other OOPS interview questions could be about different concepts of OOPs, such as what is Inheritance? What do you know about Abstraction? What is meant by Polymorphism? Don't forget to understand their meanings with some good examples.

8. How can you prevent a class from overriding in C#?

For this purpose, a developer makes the most from the sealed keyword. Know all about Sealed Class C#.

9. What do you know about the Local variable and the Instance variable?

A local variable is defined in the method, and the scope of the variable exists inside the method itself. On the other hand, an instance variable is defined inside the class and outside the method and scope of the variable that is present throughout the class.

10. What is a Class?

Developers define all Java codes in a class which comprises of variables and methods. Variables are attributes that demonstrate the state of a class. Methods are places where exact business logic is added in a class. They contain a set of instructions or statements to meet some specific requirements.

Note: While answering some OOPS Interview questions, it would be great to quote some real-life examples to demonstrate your full-fledge understanding of a particular concept. But make sure that your example is not extended, keep it short and straightforward.

11. What is the purpose of the finalize method?

When a developer wants to do some cleanup job on the resources which are useless in the current period then they go with "finalize method". It is a fully protected method which can be accessed by a class or derived class.

12. What are the different types of arguments?

During the declaration of the function or subroutine, a variable parameter is used. The arguments are passed into the function body. An argument must match with a defined parameter. Two common types of Arguments are Call by Value and Call by Reference.

In Call by Value argument, value pass will make changes only inside the function, and it returns the same value, no matter what is into the function.

In contrast, when you employ Call by Reference argument, then value passed make changes both inside and outside the function, and it returns the same or different values.

Wrap up

I wish you all the best for your preparation of OOPS Interview Questions. My only goal is to refresh your memory and to let you excel in your career.

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