Abstract Class
We do not create a
instance of the abstract class in C#. Abstract class cannot provide
implementations. Abstract class may contain non-final variables. Abstract class
defines few or none of the methods.Abstract classes can have implementations for
some of its members. A abstract class can have the usual flavors of class
members like private, protected.
A abstract class should be extended using
keyword “extends". A abstract class also cannot be instantiated, but can be
invoked if a main() exists. To use the definitions defined in the abstract class
the child class inherits from the abstract class and then instances of the Child
class may be easily created. Abstract class is mainly used to if you want to
derive show the hierarchical information. Abstract class is also support data
hiding. We have mainly used the abstract class code re-usability process. We have
not create the object of the abstract class because abstract class is in
incomplete. The one a most important things is if you create a abstract class so
the methods of abstract class is always abstract.
Code Sample
using System;
using
System.Collections.Generic;
using
System.Linq;
using
System.Text;
namespace
Abtract_Class
{
abstract class
manishroom
{
abstract public
int area();
}
class Squ
: manishroom
{
int s = 0;
public Squ(int
n)
{
s = n;
}
public override
int area()
{
return s * s;
}
static void
Main()
{
Squ sq =
new Squ(15);
Console.WriteLine("Area
of the manishroom= {0} ", sq.area());
Console.ReadLine();
}
}
}
Output:
Summary
Now in example we create a abstract class that name is "manishroom". The name of
abstract methods is "area". Now through a abstract class we simply so the area.
Now we see abstract class only contain a definition and derive all method which
class that is inherit abstract class. In last simple create a object of a class
and show the functionality of the class.
References
Here are some good references on abstract class and related resources.
Abstract Class Resources in C#