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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

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
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.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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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