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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

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
salma
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
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Abhi
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
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salma
Commplementary angles
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Uday
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salma
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
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a perfect square v²+2v+_
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Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
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or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
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rolling four fair dice and getting an even number an all four dice
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Kristine 2*2*2=8
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Differences Between Laspeyres and Paasche Indices
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No. 7x -4y is simplified from 4x + (3y + 3x) -7y
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Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
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. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
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what's the easiest and fastest way to the synthesize AgNP?
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China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
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Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
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what is nano technology
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what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
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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