Interfaces, on the other hand, are a contract that specifies a set of methods and properties that must be implemented by any class that implements the interface. By defining an abstract class with methods that must be implemented by its subclasses, you can create a blueprint for a certain type of functionality without providing any implementation details. Abstract methods don’t have a body and must be overridden in derived classes. In C#, abstraction can be achieved through abstract classes and interfaces.Ībstract classes are classes that cannot be instantiated, and they can contain both abstract and non-abstract methods. What is abstraction in C# and why is it important? AnswerĪbstraction is the process of simplifying complex systems by breaking them down into smaller, more manageable components and hiding the implementation details. The Dog class can also have its own additional methods, like Bark() in this case. In the example, the Dog class is derived from the Animal class and inherits the Name property and the Eat() method. Here’s an example to illustrate the concept of inheritance in C#: In C#, to create a derived class that inherits from a base class, you use the colon : symbol like this: DerivedClass : BaseClass. This promotes code reusability and allows you to make changes and extensions to a derived class without affecting the base class. Inheritance is a fundamental OOP concept that allows you to create a new class (derived class) that inherits the properties and methods of an existing class (base class).

Explain the concept of inheritance in C# with an example. An object is a concrete representation of a real-world entity that is based on the blueprint provided by the class. Objects are created based on the class definition, and each object can have its own unique data and behavior as defined by the class. The class itself doesn’t represent any actual object in the real world it only describes what an object will look like and how it will behave.Īn object in C# is an instance of a class. A class defines the structure, properties, and methods that an object will have. In C#, classes are templates that define the blueprint for creating objects. What is the difference between an object and a class in C#? Answer Here’s a simple example of a class definition: The class body is enclosed in curly braces ( ), and it can contain fields, properties, methods, and other members. To create a class in C#, you use the class keyword followed by the name of the class. How do you create a class in C#? Provide a simple example of a class definition. This is achieved through abstract classes and interfaces, allowing developers to focus on the essential features of the components rather than the details of their implementation. Abstraction: Abstraction is the process of simplifying complex systems by breaking them down into smaller, more manageable components and hiding the implementation details.This can be achieved through method overloading, method overriding, and interfaces. Polymorphism: Polymorphism allows a single method, property, or operator to be implemented in multiple ways, depending on the context in which it is called.This promotes code reusability and allows for modifications and extensions to be made without changing the base class. Inheritance: Inheritance is the concept of creating new classes (derived classes) by inheriting the properties and methods of existing classes (base classes).By hiding the internal representation and allowing access only through public methods, this approach helps to reduce the complexity of the code and enhances its maintainability. Encapsulation: This principle is about wrapping up the data (variables) and behavior ( methods) that operate on that data within a single unit, called a class.The four main principles of Object-Oriented Programming (OOP) in C# are: OOP Interview Questions PDFīy studying these questions and answers, you’ll be well-prepared to tackle any OOP interview with confidence.What are the four main principles of Object-Oriented Programming (OOP) in C#? Answer This PDF contains 50 Q&A that cover topics such as inheritance, polymorphism, encapsulation, abstraction, and more. To help you prepare for your next OOP interview, we have compiled a list of the most commonly asked OOP interview questions and answers. If you’re looking to land a job as a software developer, you’ll need to have a solid understanding of OOP concepts and principles. Object-Oriented Programming (OOP) is a popular programming paradigm that has been widely used in software development for decades.

Oops interview questions pdf