Abstract classes, sealed classes and class members in C#

Abstract classes include abstract methods and non-abstract methods. Abstract classes cannot be instantiated.

A sealed class prevents inheritance and cannot be used as a base class.

Abstract class

To declare an abstract class, you need to put the keyword abstract before the class definition. An example of aclass memberin an abstract class is as follows, where an abstract method is defined -

public abstract class Vehicle { public abstract void display(); }

The abstract method definition is followed by a semicolon because it is not implemented.

Sealed class

To declare a sealed class, you need to place the keyword seal class definition in front. A sealed class prevents inheritance, and you cannot use it as a base class.

public sealed class Test { // Class members comes here }

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