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abstract keyword in C#
The abstract keyword in C# is used for abstract classes. An abstract class in C# includes abstract and nonabstract methods. You cannot instantiate an abstract class.
Example of an abstract class Vehicle and abstract method display() −
public abstract class Vehicle { public abstract void display(); }
The abstract class has derived classes: Bus, Car, and Motorcycle. The following is an implementation of the Car derived class −
public class Car : Vehicle { public override void display() { Console.WriteLine("Car"); } }
Example
The following is an example of abstract classes in C# −
using System; public abstract class Vehicle { public abstract void display(); } public class Bus : Vehicle { public override void display() { Console.WriteLine("Bus"); } } public class Car : Vehicle { public override void display() { Console.WriteLine("Car"); } } public class Motorcycle : Vehicle { public override void display() { Console.WriteLine("Motorcycle"); } } public class MyClass { public static void Main() { Vehicle v; v = new Bus(); v.display(); v = new Car(); v.display(); v = new Motorcycle(); v.display(); } }
Output
Bus Car Motorcycle
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