Method overriding with detailed explanation

Jiteendra Sampathirao

16y20.5k70100Article

Method overriding with a detailed Explanation

7 Comments

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Suresh Paldia16y ago
Thank You Jitendra for valuable information. But i have a doubt. What if i don't use a virtual and override keywords and still write same signatured method in base and derived class? At runtime if i create an object of derived class, wil it give the same results?
- Jiteendra Sampathirao16y ago
  Hi suresh, thank you. Arrange the breakpoints in all classes and main method, run the application. U can easily understand what is going on. See subclass we are using override the addtion value is: 108 See subclass2 there we are not overriding , so the value is :88, if subclass2 override the add method answer would be 128. If any doubts leave me a message.
- Jiteendra Sampathirao16y ago
  You can create base class object and call its methods baseclass baseclsinst = new baseclass(); Console.WriteLine("Base class Addition::::::::::::" + baseclsinst.Add(23, 23)); similarly you can create derived class object and call its methods. But above article is only about method overriding. Doubts are not at all silly suresh.Those helps us to learn things.
- Jiteendra Sampathirao16y agoedited
  Hi, Example: Take some departments like HR, S/w. So these are two classes and you want to use HR class method in S/w Class.So you have to inherit the HR class. To manipulate the derived class data member values into base class method we used override key word.

Definition: Method signature in base class as well as in derived class should be same.

If you are not satisfied with the implementation of a method in the parent class, you can keep the same declaration (signature and return type), but provide a different implementation.

Important Points::

By using virtual and override keywords we can accomplish Method overriding.
The virtual modifier indicates to derived classes that they can override this method.
The override modifier allows a method to override the virtual method of its base class at run-time.

To achieve Run-time polymorphism or Late Binding, we are using Method Overriding concept.

Here, I am writing a simple program.

using System;

using System.Collections.Generic;

using System.Text;

namespace ConsoleApplication3

{

class baseclass

{

public virtual int Add(int a, int b)

{

return a + b;

}

class subclass : baseclass

{

public override int Add(int x, int y)

{

int d = 20;

return base.Add(x,y)+d;

}

class subclass2 : baseclass

{

public int Add(int x, int y)

{

int d = 40;

return base.Add(x, y) + d;

}

class something

{

public static void Main(String[] args)
{

baseclass baseclsinst = new baseclass();

Console.WriteLine("Base class Addition::::::::::::" + baseclsinst.Add(23, 23));

baseclass bscls = new subclass();

Console.WriteLine("Derived class addition:::::::::" + bscls.Add(34, 54));

baseclass bscls2 = new subclass2();

Console.WriteLine("Derived class addition:::::::::" + bscls2.Add(34, 54));

Console.ReadLine();

}