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Difference between an abstract method & virtual method
11 Answers
abstract:- abstract method can not declare any body and variables in abstract class and abstract method implemented in child class by override keyword .
virtual:- we can can declares any body and variables in virtual method it can be also implemented method in child class using override keyword.
Parvez DeveloperPosted Jan 8, 2018, 1:01 AM
abstract:- abstract method can not declare any body and variables in abstract class and abstract method implemented in child class by override keyword .
virtual:- we can can declares any body and variables in virtual method it can be also implemented method in child class using override keyword.
Parvez DeveloperPosted Jan 8, 2018, 1:01 AM
abstract:- abstract method can not declare any body and variables in abstract class and abstract method implemented in child class by override keyword .
virtual:- we can can declares any body and variables in virtual method it can be also implemented method in child class using override keyword.
Parvez DeveloperPosted Jan 8, 2018, 1:01 AM
abstract:- abstract method can not declare any body and variables in abstract class and abstract method implemented in child class by override keyword .
virtual:- we can can declares any body and variables in virtual method it can be also implemented method in child class using override keyword.
Parvez DeveloperPosted Jan 8, 2018, 1:01 AM
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Parvez DeveloperPosted Jan 8, 2018, 12:55 AM
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Parvez DeveloperPosted Jan 8, 2018, 12:55 AM
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Parvez DeveloperPosted Jan 8, 2018, 12:55 AM
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Parvez DeveloperPosted Jan 8, 2018, 12:55 AM
http://softwarecafeblog.blogspot.in/2011/05/abstract-vs-virtual-in-c.html
Munesh SharmaPosted May 2, 2014, 1:40 AM
Please refer to the following URL to know the differences between Abstract Method and Virtual Method,
http://onlydifferencefaqs.blogspot.in/2012/08/oops-difference-faqs-3.html
Umar AliPosted Sep 1, 2012, 1:18 PM
Virtual method has an implementation & provide the derived class with the option of overriding it. Abstract method does not provide an implementation & forces the derived class to override the method.
important Notes:
(a)Any Class with abstract method or property in it must be declared abstract
(b)Attempting to instantiate an object of an abstract class retults in a compilation error
Example:
|
Shape m_MyShape = new Shape(); //it is Wrong to that. |
But we can do that.
|
Shape m_MyShape = new Circle(); // True |
Or
|
Shape m_MyShape; /* declare refrences only, and the refrences can refer to intances of any concrete classes derived from abstract class */ Circle m_MyCircle = new Circle(); m_MyShape = m_MyCircle; // Also True |
Tutorial
Our Tutorial has 4 classes { Shape --> Point --> Cirlce --> Cylinder } Abstract Class Shape has 2 virtual methods Area() & Volume(), and one abstract property ShapeName
Class Point only override the inherited property ShapeName as point do not have any area or volume Also it has to properties X & Y (pntA[X,Y]) for example
Class Cirlce override method Area() & the property ShapeName and doen't override volume as it has no volume. Also Cirlce has some methods to provide its Diameter & Circumference which will be used by class Cylinder.
Class Cylinder override all methods in Class Shape, and use the service methods in
Ranjithkumar MurugesanPosted Apr 30, 2008, 3:36 AM