Abstract Class Tutorial in C#
Introduction:
- An abstract class is an incomplete and does not instantiated.
- It only used for base class.In the abstract base class only define the abstract members and methods.
- Abstract class must implement in derived class.Until it will be a compiler error.
- Cannot be implement the abstract members and methods,change the derived class to the abstract class(Put the keyword abstract in derived class).It is not an error.
- Abstract class cannot be used a sealed type.Because sealed type used for preventing inheritance.Abstract base class must be derived and implement by derived class.So we cannot used sealed type.
- In derived class using override key word to implement the abstract class method.
EX:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Abstract
{
class Program
{
static void Main(string[] args)
{
B b = new B();
b.print();
}
}
}
public abstract class A
{
public abstract void print(); //Abstract class method definition.
}
class B : A
{
public override void print() //Abstract class implementations using override key word.
{
Console.WriteLine("Abstract Class");
}
}
OUTPUT:
Abstract Class
