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One version is inherited

The overloaded version of the method named m , defined in the class named A , is inherited into the class named B . Hence, it can be called on a reference to an object instantiated from the classnamed B .

Two versions defined in class B

The other two versions of the method named m are defined in the class named B . Thus, they also can be called on a reference to an object instantiated from the class named B .

The output

As you would expect from the code that you examined for each of the three methods, the output produced by sending messages to the object asking it toexecute each of the three overloaded versions of the methods named m is shown in Figure 1 .

Figure 1 . Screen output from the project named Polymorph01.

m() m(int x)m(String y)

Parameters are not displayed

The values of the parameters passed to the methods do not appear in the output. In this program, the parameters are used solely to make it possible forthe compiler to select the correct version of the overloaded method to execute in each case.

In a real program, however, the parameters would normally be used by the code in the method for some usefulpurpose.

This output confirms that each overloaded version of the method was properly selected for execution based on the matching of method parameters to the formalargument list of each method.

Run the program

I encourage you to copy the code from Listing 4 . Use that code to create a C# console project. Compile and run the project. Experiment with thecode, making changes, and observing the results of your changes. Make certain that you can explain why your changes behave as they do.

Run my program

Click here to download a zip file containing my version of the program. Extract the folder named Polymorph01 from the zip file and save it somewhere on your disk. Start Visual C# 2010 Express and select Open Project... from the File menu. Navigate to the project folder and select the file with the extension of .sln . This should cause the project to open and be ready to run or debug as described in the earlier module titled Getting Started .


Overloaded methods have the same name and different formal argument lists. They may or may not have the same return type.

The word polymorphism means something like one name, many forms . Polymorphism manifests itself in C# in the form of multiple methods having thesame name.

Polymorphism manifests itself in three distinct forms in C#:

  • Method overloading
  • Method overriding through class inheritance
  • Method overriding through interface inheritance

This module concentrates on method overloading, sometimes referred to as compile-time polymorphism .


This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Xna0110-Polymorphism Based on Overloaded Methods
  • File: Xna0110.htm
  • Published: 02/27/14

Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version of the module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freelyavailable on cnx.org and that it was made and published without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

Complete program listing

A complete listing of the C# program discussed in this module is provided in Listing 4 .

Listing 4 . Project Polymorph01.

/*Project Polymorph01 Copyright 2009, R.G.BaldwinThis program illustrates method overloading, both within a class, andup the inheritance hierarchy. Program output is:m()m(int x) m(String y)**************************************/ using System;class A : Object { public void m() {Console.WriteLine("m()"); }//end method m()}//end class A //===================================//class B : A { public void m(int x) {Console.WriteLine("m(int x)"); }//end method m(int x)//---------------------------------// public void m(String y) {Console.WriteLine("m(String y)"); }//end method m(String y)}//end class B //===================================//public class Polymorph01 { public static void Main() {B var = new B(); var.m();var.m(3); var.m("String");//Pause until the user presses // a key.Console.ReadKey(); }//end Main}//end class Polymorph01


Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
Nasa has use it in the 60's, copper as water purification in the moon travel.
nanocopper obvius
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
analytical skills graphene is prepared to kill any type viruses .
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
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