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The effect of extending a class

The effect of having the Balloon class extend the Airship class is different from anything that you have seen in previous modules. When one class extends another class, the new class inherits all ofthe properties, events, and methods of the superclass and all of its superclasses.

Airship extends Object

In this case, the Airship class extends the Object class by default. Therefore, an object instantiated from the Balloon class contains:

  • The two properties defined in the Balloon class in Listing 2 .
  • The two properties defined in the Airship class in Listing 1 .
  • The eight methods defined in the Object class discussed earlier .

The beginning of the Driver class

At this point, I am going to show and explain the first half of the Driver class (see Listing 3 ) and relate it to the program output shown in Figure 1 .

Listing 3 . The beginning of the Driver class.

using System;namespace Airship01 { //Define a class to exercise the Balloon class and the// Airplane class. class Driver {static void Main(string[] args) {Balloon balloon = new Balloon(); balloon.range = 5;balloon.altitude = 500; balloon.passengerCapacity = 5;balloon.liftMedia = "Hot Air"; Console.WriteLine("Balloon");Console.WriteLine( "range = " + balloon.range + " miles");Console.WriteLine( "altitude = " + balloon.altitude + " feet");Console.WriteLine("passenger capacity = " + balloon.passengerCapacity);Console.WriteLine("lift media = " + balloon.liftMedia);

For convenience and because of their small sizes, I elected to define all four classes in the same file as the file that contains the Driver class with the Main method. That is not a requirement, however, and on large projects you may want to put each class definition inits own file.

Code common to all four classes

The single line of code at the very beginning of Listing 3 applies to all four classes. You have seen this before so it should not be new to you.

Instantiate a new Balloon object

The Main method begins by instantiating a new object of the Balloon class and saving its reference in a reference variable of type Balloon named balloon . This reference will be used later to access the new object.

Set properties in the Balloon object

Then the Main method calls the four set methods belonging to the new Balloon object, using them to set values into the four properties belonging to the Balloon object.

Remember that the set methods that hide two of the properties are defined in the Airship class and are inherited into the Balloon class. The other two set methods are defined in the Balloon class.

Get and display property values

After that, the Main method calls the four get methods belonging to the new Balloon object, using them to get and display values from the four properties belonging to the new Balloon object.

The get methods that hide two of the properties are defined in the Airship class and are inherited into the Balloon class. The other two get methods are defined in the Balloon class.

Questions & Answers

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
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
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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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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