Abstract classes

An abstract class is a special kind of class that cannot be instantiated.it only allows other classes to inherit from it but cannot be instantiated.

Abstract classes have certain restrictions.

They cannot be constructed directly.

using System;

abstract class AbstractClassTest

{

public int a;

public abstract void A();

}

class Example1 : AbstractClassTest

{

public override void A()

{

Console.WriteLine("Example1.A");

base.a++;

}

class Example2 : AbstractClassTest

{

public override void A()

{

Console.WriteLine("Example2.A");

base.a--;

}

class Program

{

static void Main()

{

// Reference Example1 through AbstractClassTest type.

AbstractClassTest test1 = new Example1();

test1.A();

// Reference Example2 through AbstractClassTest type.

AbstractClassTest test2 = new Example2();

test2.A();

}

3 Replies

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Abhay Shanker12y ago
An abstract class is a special kind of class that cannot be instantiated.it only allows other classes to inherit from it but cannot be instantiated.

Abstract classes have certain restrictions.
They cannot be constructed directly.

using System;

abstract class AbstractClassTest
{
public int a;
public abstract void A();
}

class Example1 : AbstractClassTest
{
public override void A()
{
Console.WriteLine("Example1.A");
base.a++;
}
}

class Example2 : AbstractClassTest
{
public override void A()
{
Console.WriteLine("Example2.A");
base.a--;
}
}

class Program
{
static void Main()
{
// Reference Example1 through AbstractClassTest type.
AbstractClassTest test1 = new Example1();
test1.A();

// Reference Example2 through AbstractClassTest type.
AbstractClassTest test2 = new Example2();
test2.A();
}
}
Abednego Vubu12y ago
Abstract classes,helps the subclasses to be able to use the objects and the same method name in the super class,and you can not instantiate from an abstract class
Mbuso Asanda Zulu12y ago
try this link its might help http://msdn.microsoft.com/en-us/library/k535acbf%28v=vs.71%29.aspx