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The methods in the interface should control access to, or provide a pathway to the private instance variables.

Not bound to the implementation

The interface should be generic in that it is not bound to any particular implementation. Hence, the class author should be able to change theimplementation without affecting the using programs so long as the interface doesn't change.

In practice, this means that the signatures of the interface methods should not change, and that the interface methods and their arguments should continueto have the same meaning even if the author of the class changes the internal implementation.

Preview

I will present and explain a simple C# console program named Probs01 that illustrates encapsulation and C# properties in the remainder of this module. Theoutput from the program is shown in Figure 1 .

Figure 1 . Output from the program named Props01.

text: Quit color: Redcolor: Bad color height: 20double height: 40 height: 0

Discussion and sample code

Will explain in fragments

I will explain the code in this program in fragments. A complete listing of the program is provided in Listing 11 near the end of the module.

Two classes

The program contains two separate class definitions. One class, named TargetClass , illustrates encapsulation and properties. The other class named Props01 instantiates an object of TargetClass and exercises its interface. For simplicity, both classes were defined in thesame physical file, but that is not a requirement.

Will switch between classes

In an attempt to help you understand how the program works, I will switch back and forth between the two classes showing the cause and effect relationshipbetween the code in one class and the code in the other class.

Listing 1 . Beginning of the class named Props01.

using System; namespace Props01{class Props01{ static void Main(string[]args){ TargetClass obj = new TargetClass();//Access a public instance variable obj.text = "Quit";Console.WriteLine("text: " + obj.text);

The declarations

The first two statements in Listing 1 apply equally to both classes. The first statement "uses" the namespace named System . This eliminates the requirement to qualify every reference to the Console class with the name of the namespace containing the Console class.

The second statement in Listing 1 establishes the namespace for the new program code, which is actually the name of the folder containing the sourcecode file.

Beginning of the class named Props01

The class definition for the class named Props01 begins with the keyword class shown in Listing 1 .

As you will see when we get to the end of the explanation, the only thing that is contained in this class is the Main method. The required signature for the Main method is shown in Listing 1 . I'm not going to explain all of the ramifications for the syntax of the method signature. At this point, I will simply tell you to memorize thesyntax.

The first statement in the Main method uses the new operator to instantiate an object of the class named TargetClass and save a reference to that object in a local reference variable named obj . This reference will be used later to access the object.

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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