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The file named MyRectangle.as

The class named MyRectangle is so similar to the class named MyCircle that it doesn't warrant a detailed explanation. A complete listing of the file is provided in Listing 13 near the end of the lesson.

The constructor receives and saves numeric values for the width and the height of the rectangle.

The overridden area method computes the area as the product of the width and the height and concatenates that information into a returned String object where it is displayed in the format shown in Figure 5.

Run the program

I encourage you to run this program from the web. Then copy the code from Listing 9 through Listing 13. Use thatcode to create a Flex project. Compile and run the project. Experiment with the code, making changes, and observing the results of yourchanges. Make certain that you can explain why your changes behave as theydo.

Resources

I will publish a list containing links to ActionScript resources as a separate document. Search for ActionScript Resources in theConnexions search box.

Complete program listing

Complete listings of the Flex and ActionScript files used in this program are provided in Listing 9 through Listing 13 below.

Listing of the file named polymorph02.mxml.

<?xml version="1.0" encoding="utf-8"?><!--Illustrates polymorphism.--><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"xmlns:cc="CustomClasses.*"><cc:Driver/></mx:Application>

Listing of the file named driver.as.

package CustomClasses{ import flash.events.*;import mx.containers.VBox;import mx.controls.Button; import mx.controls.Label;import mx.controls.TextArea;public class Driver extends VBox{ private var textArea:TextArea = new TextArea();public function Driver(){//constructorvar label:Label = new Label(); label.text = "Polymorphism Demonstration";label.setStyle("fontSize",14); label.setStyle("color",0xFFFF00);addChild(label);var button:Button = new Button(); button.label = "GO";addChild(button);textArea.width = 200; textArea.height = 70;addChild(textArea);button.addEventListener( MouseEvent.CLICK,buttonHandler);}//end constructorprivate function buttonHandler( event:MouseEvent):void{var randomChoice:Number = Math.random(); var radius:uint = uint(10*Math.random() + 1);var width:uint = uint(10*Math.random() + 1); var height:uint = uint(10*Math.random() + 1);var myShape:MyShape;if(randomChoice<0.33333){ myShape = new MyShape();}else if(randomChoice<0.66666){ myShape = new MyCircle(radius);}else{ myShape = new MyRectangle(width,height);} textArea.text = myShape.area();}//end buttonHandler }//end class}//end package

Listing of the file named myshape.as.

package CustomClasses{ public class MyShape{public function area():String{ return "General Shape\n" +"Unable to compute area."; }// end area method}//end class }//end package

Listing of the file named mycircle.as.

package CustomClasses{ public class MyCircle extends MyShape{private var radius:Number;public function MyCircle(radius:Number){//constructor this.radius = radius;}//end constructoroverride public function area():String{ return "Circle\n" +"Radius = " + radius + "\n" + "Area = " + Math.PI * radius * radius;}//end area }//end class}//end package

Listing of the file named myrectangle.as

package CustomClasses{ public class MyRectangle extends MyShape{private var width:Number; private var height:Number;public function MyRectangle(width:Number,height:Number){//constructor this.width = width;this.height = height; }//end constructoroverride public function area():String{return "Rectangle\n" + "Width = " + width + "\n" +"Height = " + height + "\n" + "Area = " + width * height;}//end area }//end class}//end package

Miscellaneous

This section contains a variety of miscellaneous materials.

Housekeeping material
  • Module name: Polymorphism - The Big Picture
  • Files:
    • ActionScript0110\ActionScript0110.htm
    • ActionScript0110\Connexions\ActionScriptXhtml0110.htm
PDF disclaimer: Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.

-end-

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, Object-oriented programming (oop) with actionscript. OpenStax CNX. Jun 04, 2010 Download for free at http://cnx.org/content/col11202/1.19
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