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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 .

Summary

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 .

Miscellaneous

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
Disclaimers:

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

-end-

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
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s. Reply
what is fullerene does it is used to make bukky balls
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are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
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what is the actual application of fullerenes nowadays?
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That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
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is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
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On having this app for quite a bit time, Haven't realised there's a chat room in it.
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Source:  OpenStax, Xna game studio. OpenStax CNX. Feb 28, 2014 Download for free at https://legacy.cnx.org/content/col11634/1.6
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