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For example, you might incorporate a Cockpit object, a LandingGear object, a Propeller object, etc. Then, (even though it wouldn't be good grammar), you could say than an object ofyour Airplane class "has a" Cockpit object, "has a" LandingGear object, etc. This is often referred to as a HASA relationship. For example, an airplane ISA airship andHASA cockpit.

Preview

The airship hierarchy

A little earlier I explained an airship hierarchy involving an Airship class, a Balloon class, and an Airplane class. I will present and explain a sample program that implements that hierarchy. The output from the program is shown in Figure 1 . I will refer back to Figure 1 in the paragraphs that follow.

Figure 1 . Output from the program named Airship01.

Balloon range = 5 milesaltitude = 500 feet passenger capacity = 5lift media = Hot Air Airplanerange = 5000 miles altitude = 35000 feetcargo capacity = 20000 pounds engine type = jet

Discussion and sample code

Will explain in fragments

I will explain this program in fragments. A complete listing of the program is provided in Listing 4 near the end of the module.

Four class definitions

This program consists of four class definitions:

  • Airship
  • Balloon
  • Airplane
  • Driver

The Airship class defines properties that are common to machines that fly:

  • Range
  • Altitude

The Balloon class extends the Airship class and defines properties that are peculiar to airships that are lighter than air:

  • Passenger capacity
  • Lift Media (hot air, helium, or hydrogen)

The Airplane class extends the Airship class and defines properties that are peculiar to airplanes:

  • Cargo capacity
  • Engine type

The Driver class instantiates objects of the Balloon class and the Airplane class and exercises their set and get methods.

The Airship class

Listing 1 shows the Airship class in its entirety.

Listing 1 . The Airship class.

//Define common properties in the base class. class Airship {private int rangeData = 0; private int altitudeData = 0;public int range { get {return rangeData; }//end getset { rangeData = value;}//end set }//end range propertypublic int altitude { get {return altitudeData; }//end getset { altitudeData = value;}//end set }//end altitude property}//end class Airship

There is nothing in Listing 1 that you haven't seen in earlier modules. This class provides set and get methods for two properties named range and altitude .

The Balloon class

Listing 2 shows the Balloon class in its entirety.

Listing 2 . The Balloon class.

//Define unique properties in the subclass. class Balloon : Airship {private int passengerCapacityData; private String liftMediaData;public int passengerCapacity { get {return passengerCapacityData; }//end getset { passengerCapacityData = value;}//end set }//end passengerCapacity propertypublic String liftMedia { get {return liftMediaData; }//end getset { liftMediaData = value;}//end set }//end liftMedia property}//end Balloon class

The new material

The only thing in Listing 2 that is new to this module is the colon that appears between the words Balloon and Airship on the second line. This is the C# way of specifying that the class named Balloon extends or inherits from the class named Airship . In this case, the Balloon class is the subclass or derived class and the Airship class is the superclass or base class, depending on which flavor of jargon you prefer.

Questions & Answers

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
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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
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Introduction about quantum dots in nanotechnology
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what does nano mean?
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nano basically means 10^(-9). nanometer is a unit to measure length.
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characteristics of micro business
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for teaching engĺish at school how nano technology help us
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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
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
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Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
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s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
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On having this app for quite a bit time, Haven't realised there's a chat room in it.
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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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