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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.


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

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
Commplementary angles
Idrissa Reply
im all ears I need to learn
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what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
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Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
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J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
I'm not good at math so would you help me
what is the problem that i will help you to self with?
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
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
what is system testing
what is the application of nanotechnology?
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
anybody can imagine what will be happen after 100 years from now in nano tech world
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
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
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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