1) A class is called an abstract class if it is marked with an abstract keyword. 2)The reason for which abstract class came into existence is that it provides a default functionality to its subclasses ...

For example, you can define methods, properties, and events in an interface or an abstract class that must be implemented by types that extend it. However, from C# 8.0 onward, an interface can ...

An example of an abstract class Network with userName fields, password and three abstract methods. The method void post (String message) logs the user and if login is successful, sends a message and ...

The program demonstrates the usage of an abstract class using Facebook as an example.

Abstract classes can have state with instance variables. This means that an instance variable can be used and mutated. Here’s an example: public abstract class AbstractClassMutation { private ...