Inheritance and Interface Interview Questions in C# with Answers

Interview Questions on Inheritance in C++

Q #1) What Is Inheritance? …
Q #2)What are a Base and derived class? …
Q #3) How to implement inheritance? …
Q #4) What are C++ access modifiers? …
Q #5) Why use access modifiers in C++? …
Q #6) Why is inheritance required? …
Q #7) What are the advantages of inheritance?

Part 7 .Net c# OOPS interview questions on Inheritance

So if a method in Class D calls a method defined in Class A and Class D has not overridden the invoked method. But both Class B and Class C have overridden the same method differently. Now, the ambiguity is, from which class does, Class D inherits the invoked method: Class B, or Class C?

In this article, I am going to discuss the most frequently asked Inheritance and Interface Interview Questions and Answers in C#. Please read our previous article where we discussed the most frequently asked C# Interview Questions and Answers. As part of this article, we are going to discuss the following Inheritance and Interface Interview Questions in C# with answers.

This is the most commonly asked interview question. This interview question is being asked in almost all the dot net interviews. It is very important that we understand all the concepts of interfaces and abstract classes. Interfaces are very powerful. If properly used, interfaces provide all the advantages as listed below.

If we have an implementation (function with the body) that will be the same for all the derived classes, then it is better to go for an abstract class instead of an interface. When we have an interface, we can move our implementation to any class that implements the interface. Whereas, when we have an abstract class, we can share implementation for all derived classes in one central place, and avoid code duplication in derived classes.

Yes, an interface can inherit from another interface. It is possible for a class to inherit an interface multiple times, through base classes or interfaces it inherits. In this case, the class can only implement the interface one time, if it is declared as part of the new class. If the inherited interface is not declared as part of the new class, its implementation is provided by the base class that declared it. It is possible for a base class to implement interface members using virtual members; in that case, the class inheriting the interface can change the interface behavior by overriding the virtual members.

Introduction to Inheritance Interview Questions and Answers

Inheritance is a very popular and a common word for all the techies who belong from a development background. This is among the core features of the object-oriented programming paradigm popularly known as OOPs. Many programming languages such as Java, C++, Lisp, Perl, Python, Scala, etc. support inheritance in some way or the other.

The core fundamental idea behind inheritance is the use of classes and objects that acquires other entities’ similar properties, thereby reducing the additional effort of reprogramming and rebuilding that piece of code. This helps in keeping the class file short, precise, crisp and of a comparatively lower cost with respect to space-time complexity. Here, in this article, we will present a list of inheritance interview questions for you.

If you are looking for a job related to Inheritance, you need to prepare for the 2022 Inheritance Interview Questions. Every interview is indeed different as per the different job profiles. Here, we have prepared the important Inheritance Interview Questions and Answers, which will help you succeed in your interview.

In this 2022 Inheritance Interview Questions article, we shall present the 10 most important and frequently asked Inheritance interview questions. These questions are divided into two parts are as follows:

Part 1 – Inheritance Interview Questions (Basic)

This first part covers basic Inheritance Interview Questions and Answers.

Answer: Different Object-Oriented Programming techniques are Abstraction, Encapsulation, and Polymorphism. Java supports many other features but not multiple inheritances because it would create ambiguity and bring a lot of confusion and chaos. Let’s give you more insight into it by making use of an example. Suppose we have created two classes, A and B, with the same method name: hello(), and we have also created another class, C, which is extending/inheriting the characteristics and the properties of the classes of A, B. Now, the java compiler will not understand the hello() method, which is extended by the class C is the result of which class, which calls for ambiguity.

Answer: When we say that we can’t inherit a constructor, a subclass instance cannot be created by using any of the superclass constructors. You cannot do this because you do not want a superclass constructor’s properties to be overridden. This would have been possible if the inheritance was in the picture, but it is not because doing that would conflict with another concept known as Encapsulation.

Answer: The difference between inheritance and composition are as below:

S.No.	Inheritance	Composition
1.	The IS-A relationship defines it.	The HAS-A relationship defines it.
2.	The base class carries a derived object definition and therefore is tightly bound.	The composing object holds an external link to the composing classes, and therefore composition is loosely bound.
3.	Runtime polymorphism	Dependency Injection
4.	Unit classes can only inherit single classes.	Unit class components can be composed with more than one class at a time.
5.	Relationship among classes	Relationship among objects

Answer: These are the basic Inheritance Interview Questions asked in an interview. Classes are extended, whereas interfaces are implemented in case of inheritance; there is a slight variation in the above definition. An interface extends an interface, and a class implements an interface in case of inheritance. The class/interface, which is the derivative one, is also known as the subclass or child class or base class, and the parent class is also known as the superclass, which provides its properties to the class extending it.

Answer: Yes, that is possible. For example, properties such as Serializable and Comparability can coexist in a class and therefore, this feature can also promote the use of polymorphism. Yes, a single interface is capable of extending multiple interfaces. To cite an example, the interface java.util.The list extends both the Iterable and Collection interface.

Example: Inheritance in C++ Programming

Create game characters using the concept of inheritance.

In this program, Person is a base class, while MathsTeacher and Footballer are derived from Person

Person class has two data members – profession and age. It also has two member functions – walk() and talk().

Both MathsTeacher and Footballer can access all data members and member functions of Person.

However, MathsTeacher and Footballer have their own member functions as well:teachMaths() and playFootball() respectively. These functions are only accessed by their own class.

In the main() function, a new MathsTeacher object teacher is created.

Since, it has access to Person’s data members, profession and age of teacher is set. This data is displayed using the display() function defined in the Person class. Also, the teachMaths() function is called, defined in the MathsTeacher class.

Likewise, a new Footballer object footballer is also created. It has access to Person’s data members as well, which is displayed by invoking the display() function. The playFootball() function only accessible by the footballer is called then after.

When creating a derived class from a base class, you can use different access specifiers to inherit the data members of the base class.

These can be public, protected or private.

In the above example, the base class Person has been inherited public-ly by MathsTeacherand Footballer.

FAQ

How do you explain inheritance in a job interview?

Question: How To Describe Inheritance In Interview? Inheritance means one object acquires all the properties and behaviors of parent object. Inheritance is a compile-time mechanism. A super-class can have any number of subclasses.

What is inheritance in OOPs interview questions?

If you derive a class from another class that is known as inheritance. The child class will inherit all the public and protected properties and methods from the parent class. The child class can also have its own properties and methods. An inherited class is defined by using the extends keyword.

What is inheritance in C++ interview?

Inheritance is a feature or a process in which, new classes are created from the existing classes. The new class created is called “derived class” or “child class” and the existing class is known as the “base class” or “parent class”. The derived class now is said to be inherited from the base class.

What is inheritance in C?

Inheritance is a mechanism of reusing and extending existing classes without modifying them, thus producing hierarchical relationships between them. Inheritance is almost like embedding an object into a class.

inheritance interview questions c#

Part 7 .Net c# OOPS interview questions on Inheritance

Introduction to Inheritance Interview Questions and Answers

Part 1 – Inheritance Interview Questions (Basic)

Example: Inheritance in C++ Programming

FAQ

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inheritance interview questions c#

Part 7 .Net c# OOPS interview questions on Inheritance

Introduction to Inheritance Interview Questions and Answers

Part 1 – Inheritance Interview Questions (Basic)

Example: Inheritance in C++ Programming

FAQ

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