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Hopefully most of this terminology will become clear as we pursue these lessons.

Sample code

We have reached the point in this discussion where I should provide some examples of ActionScript 3 class definitions so that you can get a preview ofwhat lies ahead.

A simple class named MyClass

The code beginning with the word public in Listing 1 is the definition of a very simple class named MyClass . I don't expect this code to mean much to you at this point. Suffice it to say that an object of this class is anew GUI component consisting of a Button object, a RadioButton object, and a NumericStepper object, all contained in a VBox object.

Class file named myclass.as.

package Classes{ import mx.containers.VBox;import mx.controls.Button; import mx.controls.RadioButton;import mx.controls.NumericStepper;public class MyClass extends VBox{ //Constructor followspublic function MyClass(){ addChild(new Button());addChild(new RadioButton()); addChild(new NumericStepper());setStyle("backgroundColor",0xFFFF00); }//end constructor}//end class }//end package

A new data type

The definition of the class creates a new data type, which is unknown to the compiler until it is defined by the programmer.

Two instances (objects) of the class named MyClass

Two objects of the new class named MyClass are shown in Figure 2. You should be able to spot the Button object (rectangular) , the RadioButton object (circular) , and the NumericStepper object in each of the two MyClass objects.

Two objects of the class named myclass.

Missing image.
Two objects of the class named MyClass.

A yellow background

Normally you can't see a VBox object. You can only see the components that it contains. However, I included code in Listing 1 to set the background style of the VBox object to yellow to make it possible for you to visually separate the two new custom objects in Figure 2.

The Flex MXML file

Listing 2 shows the Flex file that was used to instantiate the two objects of the class named MyClass and to display them in the Flash Player window in a browser.

Flex file named simpleclass01.mxml.

<?xml version="1.0" encoding="utf-8"?><!--SimpleClass01 --><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"xmlns:classes="Classes.*"><classes:MyClass /><classes:MyClass /></mx:Application>

The two lines of code beginning with the words classes in Listing 2 cause thetwo new objects to be instantiated and displayed.

Another custom component - NumericTextAreaA

One of the standard Flex components is named TextArea . This component is an object of the ActionScript class having the same name.

A custom component that extends TextArea

As an example of creating a new custom component that extends an existing class, I will present and discuss a new custom component that extends the TextArea class. The new class is named NumericTextAreaA.

An object of the NumericTextAreaA class behaves just like an object of the standard TextArea class except that the new component will only accept numeric characters, the space character, the backspace character, and the return character. Allother characters are rejected when the user attempts to type them into the text area.

Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
is Bucky paper clear?
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket 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?
I'm interested in nanotube
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
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit 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, 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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