NFS Technology Group Interview Questions and Answers

OOPs concepts are the principles of Object-Oriented Programming that help in designing and implementing software solutions.

• Encapsulation - binding data and functions together

• Inheritance - creating new classes from existing ones

• Polymorphism - ability of objects to take on multiple forms

• Abstraction - hiding implementation details from users

• Objects - instances of classes that encapsulate data and behavior

.NET is a software framework developed by Microsoft for building Windows applications.

• It provides a programming model, a comprehensive API set, and runtime environment for building applications.

• It supports multiple programming languages such as C#, VB.NET, F# and more.

• It includes a large class library called Framework Class Library (FCL) that provides reusable code for common programming tasks.

• It also includes tools fo...read more

Polymorphism is the ability of an object to take on many forms.

• Polymorphism allows objects of different classes to be treated as if they are of the same class.

• It is achieved through method overloading and method overriding.

• Example: A shape class can have multiple subclasses like circle, square, etc. and all can be treated as shapes.

• Polymorphism helps in achieving loose coupling and flexibility in code design.

Boxing is the process of converting a value type to a reference type, while unboxing is the opposite.

• Boxing is done implicitly when a value type is assigned to an object reference.

• Unboxing is done explicitly by casting the object reference back to the value type.

• Boxing and unboxing can have performance implications and should be used judiciously.

• Example: int i = 10; object obj = i; //boxing int j = (int)obj; //unboxing