what is an abstract base class?

Question

Hi friends what is an abstract base class?

Vulpes · Answer

It's a class which can't instantiated itself but which provides several abstract methods or properties which 'concrete' derived classes can override to provide a suitable implementation. For example: using System; public abstract class Animal { public abstract void MakeNoise(); } public class Dog : Animal { public override void MakeNoise() { Console.WriteLine(Woof!); } } public class Cat : Animal { public override void MakeNoise() { Console.WriteLine(Meow!); } } class Test { static void Main() { Animal rover = new Dog(); rover.MakeNoise(); Animal tiddles = new Cat(); tiddles.MakeNoise(); Console.ReadKey(); } }