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Call the object's public accessor methods

Returning to the Main method in the class named Props01 , Listing 3 calls the object's public accessor methods named setColor and getColor twice in succession.

Listing 3 . Call the object's public accessor methods.

//Call public accessor methods obj.setColor("Red");Console.WriteLine("color: " + obj.getColor()); //Call public accessor methods again with an// invalid input value. obj.setColor("Green");Console.WriteLine("color: " + obj.getColor());

The setColor method

The purpose of the method named setColor is to store a string value in the object. The calling code has no way of knowing how the valueis stored because the implementation is hidden behind a public interface method. This is an example of encapsulation.

The string value to be stored is passed as a parameter to the method each time the method is called. An invalid string value was purposely passed as aparameter on the second call to the setColor method.

The getColor method

The purpose of the getColor method is to retrieve the string value previously stored in the object by the setColor method. Once again, the calling code has no way of knowing how the value is retrievedand returned because the implementation is hidden behind a public interface method.

The value that is retrieved by each call to the getColor method is displayed on the standard output device (the black screen).

Would be a property in Java

If this were a Java program, the combination of these two methods would constitute a property named color because the pair of methods matches the design pattern for properties in Java. However, that is not the casein C#. As you will see later, C# uses a different approach to identify properties. In C#, these are simply public accessor methods used for informationhiding.

The definition of setColor and getColor in TargetClass

Listing 4 defines the public setColor and getColor methods in the class named TargetClass .

Listing 4 . Definition of setColor and getColor methods in TargetClass.

private string colorData = ""; public void setColor(string data){//Validating code if(data.Equals("Red") || data.Equals("Blue")){//Accept incoming data value colorData = data;}else{ //Reject incoming data valuecolorData = "Bad color"; }//end if-else}//end setColor //--------------------------------------------------//public string getColor(){ return colorData;}//end getColor

Typical method definitions

These two methods are typical of the method definition syntax in C#. The syntax is not too different from a function definition in C++ so you should haveno trouble understanding the syntax.

Data validation

One of the reasons for hiding the implementation behind public accessor methods is to assure that only valid data isstored in the object. Therefore, public accessor methods that store data in the object often contain code that validates the incoming data (as shown in Listing 4 ) before actually storing the data in the object.

The validation code in Listing 4 will only accept incoming color data of "Red" or "Blue". If the incoming string doesn't match one of those two values,the string "Bad color" is stored in the object in place of the incoming value.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
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..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
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.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
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
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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