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 a class member in 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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