C# Abstract Classes

What is an Abstract Class?

An abstract class is a class that cannot be used to create objects directly.

It serves as a base class for other classes and is used to define common structure and behavior.

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An abstract method is a method without a body.

Any class that inherits from an abstract class must provide an implementation for all abstract methods.

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Abstract classes can also contain normal methods with implementations.

These methods can be reused by all child classes.

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You cannot create an object of an abstract class directly.

Instead, you create objects of classes that inherit from it.

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Abstract classes can have constructors, which are called when a subclass object is created.

This is useful for initializing shared data.

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Both abstract classes and interfaces are used for abstraction, but they have key differences.

Abstract classes help you define a common structure while allowing flexibility in implementation.

Different shapes can share a base structure but calculate or draw differently.

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Create an abstract class Shape with a Draw() method. Then create Circle and Rectangle classes that implement it.

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