Class object

Hi,
I have a question about the class Class. Assume that I have written a program containing 3 classes (say 1.java, 2.java, 3.java). Now, when the program is compiled, we get 3 classes namely 1.class, 2.class and 3.class. Are these the classes that actually contain the meta-data needed when a new object of that class is created OR are there going to be 3 other classes that is loaded by JVM when these classes are loaded, and that contain info abt these classes?
Thanks for the help in advance.
Aravind

Well, first off 1.java, 2.java, 3.java won't compile... ;->
Anyway, yes, the .class files contain all the information necessary to construct instances of a class and to define its fields, constructors, methods, etc. The instance of Class associated with the particular Java class derived from the contents of the .class file.
Chuck

Similar Messages

Problem with Dynamically accessing EJB Class objects in WL 7.0 SP1

I am trying to build a component which has the ability to instantiate and execute
an known EJB method on the fly.
I have managed to build the component but when I try and execute it I get a ClassNotFoundException.
I know that the EJB I am trying to invoke is deployed and available on the server,
as I can see it in the console, I also seen to have been able to get the remote
interface of the object, my problem occurs when I try and access the class object
so I can perform a create on the object and then execute my method
The code I have written is below:
private Object getRemoteObject(Context pCtx, String pJNDIName, String pHomeBean)
throws Exception {
     String homeCreate = "create";
     Class []homeCreateParam = { };
     Object []homeCreateParamValues = {};
try {
//This call seems to work and doesn't throw an exception
Object home = pCtx.lookup(pJNDIName);
//However this call throws a java.lang.ClassNotFoundException
Class homeBean = Class.forName(pHomeBean);
Method homeCreateMethod = homeBean.getMethod(homeCreate,homeCreateParam);
return homeCreateMethod.invoke(home, homeCreateParamValues);
} catch (NamingException ne) {
logStandardErrorMessage("The client was unable to lookup the EJBHome.
Please make sure ");
logStandardErrorMessage("that you have deployed the ejb with the JNDI
name "+pJNDIName+" on the WebLogic server ");
throw ne;
} catch (Exception e) {
logStandardErrorMessage(e.toString());
throw e;
Any advice would be really appreciated, I'm fast running out of ideas, I suspect
it has something to do with the class loader but I'm not sure how to resolve it
Regards
Jo Corless

Hello Joanne,
Congratulations! I'm very happy that you've managed to fix your problem. It's
always essential to understand how to package applications when deploying on BEA
WebLogic. Usually, by throwing everything into an EAR file solves just about all
the class loader problems. :-) Let us know if you have any further problems that
we can assist you with.
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Joanne Corless" <[email protected]> wrote:
>
>
I've fixed it!!!!!!!!
Thanks to everyone who gave me help!!!!
The class loader was the culprit which is what I suspected all along.
As soon
as I put the 2 jar files I was using into an EAR file the problem went
away!!!!!
Thanks again
Jo Corless
"Ryan LeCompte" <[email protected]> wrote:
Hello Joanne,
As Mr. Woollen mentioned, I also believe it's a problem with the class
loader.
You need to be careful how you arrange your EJBs, because WebLogic has
a specific
method in which it loads classes in an EAR, JAR, and WAR file(s). Please
refer
to http://dev2dev.bea.com/articles/musser.jsp for more information about
BEA WebLogic
class loading mechanisms and caveats. Also, try printing out the various
methods
that are available on the object that was returned to you via reflection.
For
example, use the getMethods() method, which returns an array of Method
objects
that you can subsequently cycle through and print out the various method
names.
This way you can discover if the class found/returned to you is indeed
the one
you intend to locate.
Hope this helps,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
Rob Woollen <[email protected]> wrote:
I believe the issue is the home interface class for this EJB is not
available in the class loader which is doing the reflection.
If you do:
getClass().getClassLoader().loadClass(homeInterfaceClassName)
I suspect it will fail. Reflection still requires that the class be
loadable.
-- Rob
Joanne Corless wrote:
Hi Slava,
If I make my code look like you describe below I get a compliationerror telling
me that
home.getMethod() is not recognised (no such method)
If I change it slightly and use
Method homeCreateMethod =
home.getClass().getMethod(homeCreate,homeCreateParam);
The code will compile OK but when executed it still throws a NoSuchMethodException
Any ideas ?
Thanks for your help so far
Regards
Jo Corless
Your code should look like
Object home = pCtx.lookup(pJNDIName);
Method homeCreateMethod =
home.getMethod(homeCreate,homeCreateParam);
return homeCreateMethod.invoke(home, homeCreateParamValues);
Regards,
Slava Imeshev
"Joanne Corless" <[email protected]> wrote in message
news:[email protected]...
Hi Ryan,
I also wanted to mention that if you do a "header search" in this
particular
newsgroup
with the search query as "reflection", you will see many previousmessages
regarding
reflection and EJBs. I believe you could learn a lot from thedifficulties
that
others have faced and solved.I tried that and although there was a number of similar cases noneof them
actually
seem to fix my issue. Thanks for the suggestion though
Are the EJBs that you are trying to access accessible via your
system
classpath?
Try to avoid having them accessible via the main system classpath,and
only bundle
them in your appropriate EJB jar files (contained in an EAR file,for
example).Maybe I should have laid the problem out a little clearer.
I have a number of EJB's bundled up in a JAR file which is hot deployedto
the
server. Within this first JAR file is an EJB (SSB) component that
needs
to
be
able to invoke a known method on another EJB. This second EJB may
or
may
not be
within the first JAR file but it also will be hot deployed.
The component trying to invoke the method on the 2nd EJB has to
be
able to
create
an instance of the 2nd EJB without actually knowing anything bar
a
JNDI
Name which
is passed in at runtime.
I can get as far as doing the
Object home = pCtx.lookup(pJNDIName);
This returned a class with the name
"com.csc.edc.projects.allders.httppostoffice.postman.PostmanBean_mp8qy2_Home
Impl_WLStub"
My problem seems to occur when I try and invoke the create method
Method homeCreate = home.getClass().getMethod("create", new Class[0]);
My code throws a java.lang.NoSuchMethodException at this point so
I
am
unable
to progress to the next step of :
Object bean = homeCreate.invoke(home, null);
So I can return the instantiated bean back to the calling client.
Why am I getting the NoSuchMethodException, is is because I am gettinga
stub
back rather than the home interface and if so how do I get the truehome
interface
from the bean
Thanks in advance
Jo Corless

Converting a class object back to a .class file

Hi,
How can i convert a class object back to a .class file ? Thanks

any pointers on how to do it then ? i don't have
access to the native codeIf I have understood you correctly, you have native code that generates bytecode. Currently you load the class this bytecode represents right into the classloader, but you want to save it to disk as a .class file. Right?
If so, you just have to get hold of that bytecode before it "disappears" into the classloader, and save it to disk. How you can best do this depends on exactly how you communicate with that native code.
If I have misunderstood your problem (and that's not unlikely), please try to be clearer.

How to use two activex class objects in same vi

HI
I am using labview to read ECU data from INCA software .INCA providing COMTOOL API(incacom.dll). I am using ACTIVEX for communication between INCA & Labview. My problem is If I have used single activex class object I am able to read Inca version, getting the database path etc. If I have used two activex class in same vi (one to open Inca & other one is to read the folder structure) I am not getting output.I have attached snapshot for referance
Attachments:
activex1.JPG ‏114 KB
activex2.JPG ‏107 KB

It wasnt in the first two images you posted, or I couldnt see it anyway! That was the only reason.
Did you try the database block on its own, just to confirm that it is working?
Beginner? Try LabVIEW Basics
Sharing bits of code? Try Snippets or LAVA Code Capture Tool
Have you tried Quick Drop?, Visit QD Community.

How can i add custom attributes to a new Class Object using the API ?

Hello everyone,
Here is my problem. I just created a subclass of Document using the API (not XML), by creating a ClassObjectDefinition and a ClassObject. Here is the code :
// doc is an instance of Document
ClassObject co = doc.getClassObject();
ClassObjectDefinition cod = new ClassObjectDefinition(ifsSession);
cod.setSuperclass(co);
cod.setSuperclassName(co.getName());
cod.setName("MYDocument");
ClassObject c = (ClassObject)ifsSession.createSchemaObject(cod);
Everything seems to be OK since i can see the new class when i use ifsmgr. But my question is : how can i add custom attributes to this new class ? Here is what i tried :
AttributeDefinition value = new AttributeDefinition(ifsSession);
value.setAttribute("FOO", AttributeValue.newAttributeValue("bar"));
c.addAttribute(value);
But i got the following error message :
oracle.ifs.common.IfsException: IFS-30002: Unable to create new LibraryObject
java.sql.SQLException: ORA-01400: impossible d'insirer NULL dans ("IFSSYS"."ODM_ATTRIBUTE"."DATATYPE")
oracle.ifs.server.S_LibraryObjectData oracle.ifs.beans.LibrarySession.DMNewSchemaObject(oracle.ifs.server.S_LibraryObjectDefinition)
oracle.ifs.beans.SchemaObject oracle.ifs.beans.LibrarySession.NewSchemaObject(oracle.ifs.beans.SchemaObjectDefinition)
oracle.ifs.beans.SchemaObject oracle.ifs.beans.LibrarySession.createSchemaObject(oracle.ifs.beans.SchemaObjectDefinition)
void fr.sword.ifs.GestionDocument.IFSDocument.createDocument(java.lang.String)
void fr.sword.ifs.GestionDocument.IFSDocument.main(java.lang.String[])
So, what am i doing wrong ?
More generally, are we restricted in the types of the attributes ? (for example, would it be possible to add an attribute that would be an inputStream ? Or an object that i have already created ?).
Any help would be appreciated. Thanks in advance.
Guillaume
PS : i'm using Oracle iFS 1.1.9 on NT4 SP6 and Oracle 8.1.7
null

Hi Guillaume,
you're welcome. Don't know exactly, but assume that ATTRIBUTEDATATYPE_UNKNOWN
is used to check for erronous cases only
and it shouldn't be used otherwise.
Creating your own objects could be simply done via
ClassObject ifsClassObject;
DocumentDefinition ifsDocDef = new DocumentDefinition(ifsSession);
// get class object for my very own document
ifsClassObject = ClassObject.getClassObjectFromLabel(ifsSession, "MYDOCUMENT");
// set the class for the document i'd like to create
ifsDocDef.setClassObject(ifsClassObject);
// set attributes and content for the document...
ifsDocDef.setAttribute("MYFOO_ATTRIBUTE",....);
ifsDocDef.setContent("This is the content of my document");
// create the document...
PublicObject doc = ifsSession.createPublicObject(ifsDocDef);
null

How to get a LabVIEW class object to expose an invoke-node method?

Hi,
      I like the property/invoke-node "paradigm" used for interacting with "objects". Can LabVIEW-class objects expose their properties and methods this way? Can one or more LabVIEW-class objects be compiled into a library or "assembly" (or other distrubution format) that allows the property/invoke-node usage?
I've looked at (but not completely understood) "Creating LabVIEW Classes". Have also searched for related posts.
The pic below shows an invoke node wired to a class with a Public VI "VAT.Status.Hello.vi". I'd like to see VAT.Status.Hello show-up as a Method. (I just tried "Select Method", and selected "VAT.Status.Hello.vi" but dialog's "OK" button stays greyed-out.)
Cheers.
Message Edited by tbd on 03-29-2007 03:15 PM
"Inside every large program is a small program struggling to get out." (attributed to Tony Hoare)
Attachments:
VATStat.JPG ‏54 KB

Hi Aristos,
      Thanks for the reply!  It was a bit dissappointing, though.
It appears the LabVIEW-class object will be moving away from (what seems to me) a convenient object-interface presented by the invoke-node/method paradigm - which allows us to interface with a large set of "objects" (.NET, ActiveX, LabVIEW GUI, VISA Resource, ?) in a similar manner and independent of the object's origin. Being able to read the methods and parameters that appear in these nodes is also helpful for understanding diagram logic!
I do like the option of dropping a friendly "VI looking" icon on the diagram, but perhaps an optional - even default - VI-icon representation for a class-object invoke-node is feasible - so the LabVIEW class-object could be the more generic object first, but with a traditional-G representation(?)
Given the answer "We would like, someday, to support the property node"
and "in the next version of LV, wiring the LV class to the property/invoke nodes will break the wire so we'll avoid confusion in the future",
... I guess you'll break the wire in the next version, but (perhaps) allow it again - if support of the property node is ever implemented?
Regards.
P.S. For the record, huge THANKS to whoever it was that straightened-out enumerated-types (somewhere) between LV4.1 and LV6.1.  Every time I add or remove an enumeration in a typedef, I silently give thanks to the bright and thoughtful soul(s) who made this valuable tool work so well!
Hello. This is your friendly neighborhood R&D guy for LabVIEW classes.
Regarding your request about property and invoke nodes as relates to LV classes....
Short story: We would like, someday, to support the property node. We have no intention of ever supporting the invoke node.
Long story: As we were creating LV classes, we had to evaluate the right programming interface for these things. We wanted LV classes to behave as new data types in LV. A developer should be able to create a LV class, then give it to someone who doesn't even know OO programming, and that second programmer could use the new data type without learning a lot of new concepts. From this principle, we held fast to the idea that the programming interface should be subVI calls whereever possible. The invoke node is really nothing more than a VI minus the icon. If you want, you can popup on any subvi node and uncheck the option "View as Icon". This will make the node display in a way that has the terminals listed as text, like the invoke node. So, at the end of the day, the invoke node is simply a subroutine call in LV that is language dependent, as opposed to the language independent iconography of LV generally.
The property node is a slightly different story -- the functionality of a property node is actually different than an invoke node as its terminals are various subsets of the properties available, not a fixed list of parameters like the invoke node. The property node provides a nice interface for setting multiple properties in a block and only having to check a single error return. Very friendly. Our intent is to allow you to create a VI that has 5 terminals: object in, object out, error in, error out, and either a single input or a single output of your chosen type. VIs with this conpane could be marked as "properties" of the class and would show up when you wire the class wire to the property node. We would call the subVIs behind the scenes as needed to get/set the properties.
This is on the longer term roadmap because it is "syntactic sugar" -- it sweetens the programming style, but it is not necessary to program effectively. You can get the same effect by writing those same VIs and stringing them along on a block diagram "railroad track" style. We'll probably get around to it in three or four versions of LV -- there are some major user requests that impact functionality that have to get done first.
PS -- in the next version of LV, wiring the LV class to the property/invoke nodes will break the wire so we'll avoid confusion in the future of people thinking there's a way to use these nodes.
Message Edited by Aristos Queue on 04-02-2007 09:56 AM
Message Edited by tbd on 04-03-2007 12:39 PM
"Inside every large program is a small program struggling to get out." (attributed to Tony Hoare)

What is the advantage of using IB to create XIBs/Class Objects over coding?

Hi all,
I hoping someone can provide me some pros and cons as to when I should use IB to create XIBs and/or class objects as opposed to directly coding them.
For example, if I choose Apple's Template for creating a Navigation Based Application (cocoa touch), the project creates two NIB files - MainMenu and RootViewController.
However looking at one of demo apps SimpleDrillDown, it does not have a RootViewController XIB and instead creates it via code.
Another example from the same two apps is that the template generates a "Navigation Controller" class object in the Mainmenu.xib. SimpleDrillDown does not bother with this in the XIB, but uses code to generate the controller:
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Create the navigation and view controllers
RootViewController *rootViewController = [[RootViewController alloc] init];
UINavigationController *aNavigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
self.navigationController = aNavigationController;
[aNavigationController release];
[rootViewController release];
// Configure and show the window
[window addSubview:[navigationController view]];
[window makeKeyAndVisible];
as opposed to the template which only needs this:
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Configure and show the window
// Navigation Controller is defined in MainWindow.xib
[window addSubview:[navigationController view]];
[window makeKeyAndVisible];
So what are the advantages of each approach. Why does apple suggest one approach and yet all its demos use another.
Any thoughts, answers gratefully received.
TIA, Michael.

You can do whatever you're comfortable with, but most of the best Cocoa programmers--the ones on the Mac, I mean--recommend putting everything you can into Interface Builder.
It's a little like the difference between writing a program to do a bunch of financial calculations and using a spreadsheet. Yeah, the program can do everything the spreadsheet can--and more besides--but you'll find it far easier to create, use and modify the spreadsheet.
Interface Builder takes away a lot of completely meaningless choices ("What order should I create the objects in? How should I name the variables? How should I create their frames? What order should I set the attributes in?"), leaving you with an interface optimized for creating and arranging objects, and allowing your code to focus on what you really do need to think about--your application's logic.
(By the way--part of the reason Apple's demos don't all use Interface Builder is that the very first SDK releases didn't have it. Back then, you had to create all your views programatically. Believe me, I have no wish to go back to setting autoresize masks manually. Now get off my lawn, whippersnapper.)

How to automate the creation of Function Module & Class Object (SE24)

Experts,
I have the requirement to automate the creation of any type of programs: ie function module (like how we normally create in SE37 together with the parameters), class object (like how we normally create in SE24 together with attribute & method), normal report (like how we did in SE38), module pool and so on.
For example. I backuped my program into a flat file (the entire source code in txt formal or HTML) through a download program and I need to upload back this flat file into another installation of SAP.
Does SAP provide any predefined FM to cater for the above cases or better still, does anyone know of any upload program which I can use for the above requirement.
Thanks in advance.

Hi Kris, I can't use the transport system as these are 2 separate SAP installation in a different place. The requirement came in the form of creation of program to be able to generate FM/Class/Report on the go.

Dynamic creation of class objects?

I have a requirement where in at runtime I would know the class name, method name, properties, interface..and coding lines to be put into a method?
Can anyone suggest a way to create the consumable central class object with these details, activate it and without any manual intervention create this object in backend?

From other thread...use SEO* package

Difference Between Business Object And Class Object

Hi all,
Can any one tel me the difference between business object and class Object....
Thanks...
..Ashish

Hello Ashish
A business object is a sematic term whereas a class (object) is a technical term.
Business objects are all important objects within R/3 e.g. sales order, customer, invoice, etc.
The business objects are defined in the BOR (transaction SWO1). The have so-called "methods" like
BusinessObject.Create
BusinessObject.GetDetail
BusinessObject.Change
which are implemented (usually) by BAPIs, e.g.:
Business Object = User
User.Create => BAPI_USER_CREATE1
User.GetDetail => BAPI_USER_GET_DETAIL
CONCLUSION: Business Object >< Class (Object)
Regards
Uwe

Why cannnot derived class pointer point to a base class object?

Hi,
Pleaseeee... explain me why cannot the derived class pointer point to a base class object.
I know that Base class pointer can point to a derived class object.
Thanks & Regards,
Vig....

Example:
class Base
{ public: void foo(); } * pBase;
class Derived : public Base
{ public: void bar(); } * pDerived;
Now, what would happen if you assign pDerived = new Base() and then call pDerived->bar()?By forbidding such an assignment, compiler prevents you from writing error-prone code.

Casting base class object to derived class object

interface myinterface
     void fun1();
class Base implements myinterface
     public void fun1()
class Derived extends Base
public class File1
     public myinterface fun()
          return (myinterface) new Base();
     public static void main(String args[])
          File1 obj = new File1();
          Derived dobj = (Derived)obj.fun();
Giving the exception ClassCastException......
Can't we convert from base class object to derived class.
Can any one help me please...
Thnaks in Advance
Bharath kumar.

When posting code, please use tags
The object returned by File1.fun() is of type Base. You cannot cast an object to something it isn't - in this case, Base isn't Dervied. If you added some member variables to Derived, and the compiler allowed your cast from Base to Derived to succeed, where would these member variables come from?
Also, you don't need the cast to myinterface in File1.fun()
Also, normal Java coding conventions recommend naming classes and interfaces (in this case, myinterface) with leading capital letters, and camel-case caps throughout (e.g. MyInterface)

Class object from XML.

Hi.
I want to create DataGrid with itemReneder for each column.
This is inline generated itemRenderer:
DataGridColumn.itemRenderer = new
ClassFactory(MyCustomClass);
// MyCustomClass - it manually generated class which contains
some form items(TextInput, Combox..e.t.c.)
I want to consturct ItemRenderer dynamicly. For this i need
to create Class object and send it to itemRenderer:
var component:DynamicFormClass = new DynamicFormClass();
var newComponent:Class =
component.someMethodWhichWillCreateForm(configData); // - this will
return Class which will generate form items that described in
configData
DatagridColumn.itemRenderer = new ClassFactory(newComponent);
This code is how i see solvetion of this problem, but this
doesnt work.
I really don't know how it to create and will be very
thankful for any dicision and answers how to make it.
Thank you.

"Dmitry Sergeev" <[email protected]> wrote
in message
news:g8eghj$881$[email protected]..
> Hi.
> I want to create DataGrid with itemReneder for each
column.
>
> This is inline generated itemRenderer:
> DataGridColumn.itemRenderer = new
ClassFactory(MyCustomClass);
> // MyCustomClass - it manually generated class which
contains some form
> items(TextInput, Combox..e.t.c.)
>
> I want to consturct ItemRenderer dynamicly. For this i
need to create
> Class
> object and send it to itemRenderer:
> var component:DynamicFormClass = new DynamicFormClass();
> var newComponent:Class =
> component.someMethodWhichWillCreateForm(configData);
> // - this will return Class which will generate form
items that described
> in
> configData
> DatagridColumn.itemRenderer = new
ClassFactory(newComponent);
Use getDefinitionByName and ClassFactory to dynamically
create your class.
Just be sure that you actually have at least one "hard"
reference to each
class you intend to use, or the class might not get compiled
into your swf.
Here's a full write-up of how to do that:
http://www.paulofierro.com/archives/520/
HTH;
Amy

As 2.0 class objects- how to swap depths of a movie clip

How do you bring an object to the top? if it's just a movie
clip, I could do a swapdepths, but if it's a movieclip that's part
of an AS 2.0 object, how do you swap depths of the whole object?
I create 2 objects (same class) which each have a movieclip
within them. The movie clip is created on a unique level with
getNextHighestDepth().
I have a button which tries to swapDepths of the 2 objects,
but I can't get it to work. Can anyone help?
here's the detail:
1. create a symbol in the library called "someShape_mc" and
put some shape in it - a circle, a square, whatever - this symbol
is exported for action script, and has an AS 2.0 Class of
"ClassObject" ( I also put a dynamic text field in the shape to
display the current depth - it's called "depth_txt")
2. create a button called "swap_btn" on the stage.
Frame 1 has the following actionscript:
var BottomObject:ClassObject = new ClassObject(this,100,150);
var topObject:ClassObject = new ClassObject(this,110,160);
// for the button add this:
Swap_btn.onRelease=function() {
// try it with the full path:
_root.BottomObject.__LocalMovieClip.swapDepths(_root.topObject.__LocalMovieClip);
// try it with with just the objects:
BottomObject.__LocalMovieClip.swapDepths(topObject.__LocalMovieClip);
// try it with the object as a movieclip
BottomObject.swapDepths(topObject);
trace("Did it Swap?");
// try it with a method in the class....
BottomObject.swapIt(topObject.__LocalMovieClip);
BottomObject.swapIt(topObject);
trace("nope... no swapping going on...");
================================
here's the AS file: "ClassObject.as"
class ClassObject extends MovieClip{
var __LocalMovieClip;
var __Depth;
function ClassObject(passedIn_mc:MovieClip,x:Number,y:Number)
__Depth = passedIn_mc.getNextHighestDepth();
__LocalMovieClip =
passedIn_mc.attachMovie("someShape_mc","__LocalMovieClip",__Depth);
trace("made a shape at " + __Depth);
__LocalMovieClip._x = x;
__LocalMovieClip._y = y;
__LocalMovieClip.depth_txt.text = __Depth;
public function swapIt(targetMc) {
__LocalMovieClip.swapDepths(targetMc);
__LocalMovieClip.depth_txt.text =
__LocalMovieClip.getDepth(); // no difference.
trace("Tried to swap from within the class...");
========================
so- the goal is to bring the "bottom" Class object on top of
the "top" object. The button tries various methods of swapping the
depths of the movie clips - but there is not one that works. What
am I missing?
tia
ferd

Thank you for your response - and here I have included the
code I reworked to show how it works, and doesn't work. you're
right about not needing the extra containers, but this example is
part of a bigger thing...
I'm confused - it works ONLY if I attach the movie outside
the class, even though the "attachment" occurs, I'm thinking, at
the same scope level, that is, _root.holder_mc, in both examples.
it seems that the advantage of having a class is defeated
since I have to do the extra coding for each object that will be
created. It's like the class can only have a reference to the
movieclip outside itself, and not have a clip INSIDE that is fully
functioning. am I right about this? Is there someplace good I can
learn more about class objects and movieclip usage?
also, my class object IS a movieclip, but " this.getDepth() "
is meaningless inside the class object. hmmm...
This one works..... attaching the movies at the root level
(to a holder_mc)
// Frame 1
tmp1 =
holder_mc.attachMovie("someShape_mc","tmp1",holder_mc.getNextHighestDepth());
var BottomObject:ClassObject3 = new
ClassObject3(tmp1,100,150);
tmp2 =
holder_mc.attachMovie("someShape_mc","tmp2",holder_mc.getNextHighestDepth());
var topObject:ClassObject3 = new ClassObject3(tmp2,110,160);
// for the button add this:
Swap_btn.onRelease=function() {
BottomObject.swapIt(topObject);
trace("clicked button");
// ClassObject3.as
class ClassObject3 extends MovieClip{
var __LocalMovieClip:MovieClip;
function
ClassObject3(passedInMovieClip:MovieClip,x:Number,y:Number) {
trace(" this class object is at ["+this.getDepth()+"]");
__LocalMovieClip = passedInMovieClip;
__LocalMovieClip._x = x;
__LocalMovieClip._y = y;
public function swapIt(targetMc:MovieClip):Void {
trace("do the swap in the class");
trace("===========================");
trace("target type :" + typeof(targetMc));
trace("__LocalMovieClip type :" + typeof(__LocalMovieClip));
__LocalMovieClip.swapDepths(targetMc.__LocalMovieClip);
This one does NOT work..... attaching the movies within the
class object...
// Frame 1
var BottomObject:ClassObject2 = new
ClassObject2(holder_mc,100,150);
var topObject:ClassObject2 = new
ClassObject2(holder_mc,110,160);
// for the button add this:
Swap_btn.onRelease=function() {
BottomObject.swapIt(topObject);
trace("clicked button");
// ClassObject2.as
class ClassObject2 extends MovieClip{
var __LocalMovieClip:MovieClip;
function
ClassObject2(passedInMovieClip:MovieClip,x:Number,y:Number) {
__LocalMovieClip =
passedInMovieClip.attachMovie("someShape_mc","stuff1",passedInMovieClip.getNextHighestDep th());
__LocalMovieClip._x = x;
__LocalMovieClip._y = y;
public function swapIt(targetMc:MovieClip):Void {
trace("do the swap in the class");
trace("===========================");
trace("target type :" + typeof(targetMc));
trace("__LocalMovieClip type :" + typeof(__LocalMovieClip));
__LocalMovieClip.swapDepths(targetMc.__LocalMovieClip);

Loading and viewing XML when a class object is created..Help Please

Hello,
I have writing a simple class which has a method that gets invoke when the object of the class is created. I am able to view the loaded XML content when I trace it with in my class method, but cannot assign the content to a instance variable using the mutator method. So the process goes like this:
Class object is instantiated
Class construtor then calls the loadXML method which laods the XML
And then assigns the XML to a class instance variable.
So now if I would like to access the loaded XML through class object, I should be able to see the loaded xml content which I am not able to see. I have spent over few hours and cannot get the class object to display the loaded XML content. I would highly appreciate it if someone can help in the right direction, please.
[code]
package com.as3.app
    import flash.display.*;
    import flash.events.*;
    import flash.text.*;
    import flash.net.*;
    public class Cars extends MovieClip {
           public var _CarList:Object;
           public function Quiz()
              super();
              loadCars();
// ===========================================================
//           CARS GETTER SETTER
// ===========================================================
        public function set Cars(val:XML):void
            this._CarList = val;
        public function get Cars():XML
            return this._CarList;
// ===========================================================
//            LOAD QUESTIONS FROM XML
// ===========================================================
        public function loadcars()
            var myXML:XML;
            var myLoader:URLLoader = new URLLoader();
            myLoader.load(new URLRequest("xml/cars.xml"));
            myLoader.addEventListener(Event.COMPLETE, processXML);
            function processXML(e:Event):void
                myXML = new XML(e.target.data);
                Cars = myXML;                 // Assigning the loaded xml data via mutator method to the _CarList;
//=============================================================
                              INSTANTIATING THE CLASS OBJECT
//=============================================================
package com.as3.app
    import flash.display.*;
    import flash.events.*;
    import flash.text.*;
    import flash.net.*;
    import com.as3.app.*;
    public class DocumentClass extends MovieClip {
        public var c:Car;
        public function DocumentClass()
            super();
            c = new Cars();
            trace(c.Cars);
[/code

where you have:
            super();
            c = new Cars();
            trace(c.Cars);
c.Cars will not trace as the loaded xml, because it will not have loaded in time. After some time it should presumably have the correct value.
loading operations in actionscript are asynchronous, so your nested function which is acting as the listener ( function processXML(e:Event):void) only ever executes when the raw xml data has loaded and that is (I believe, not 100% sure) always at least one frame subsequent to the current one.
In general I would consider it bad practise to use nested functions like that, but I don't think its contributing to your issues here. I think its just a timing issue given how things work in flash....
Additional observation:
your Cars constructor calls loadCars() and your loadCars method is defined as:
public function loadcars()
I assume its just a typo in the forum that the uppercase is missing in the function name....

Array of class objects

I was wondering how would you declare an array of class objects. Here is my situation:
I'm working on a project dealing with bank accounts. Each customer has a specific ID and a balance. I have to handle transactions for each customer at different times, so I was thinking that I need an array of class objects; however, I dont know how to initialize them.
Here's what I did:
BankAccount [ ] myAccount = new BankAccount[10];
// 10 = 10 customers
How do I initialize the objects?
Thankz

I was wondering how would you declare an array of
class objects. Here is my situation:
I'm working on a project dealing with bank accounts.
Each customer has a specific ID and a balance. I have
to handle transactions for each customer at different
times, so I was thinking that I need an array of
class objects; however, I dont know how to initialize
them.
Here's what I did:
BankAccount [ ] myAccount = new BankAccount[10];
// 10 = 10 customers
How do I initialize the objects?
Thankz
HAI
Use the hashtable
and store the classObject of each customer with the corresponding Id in it
and whenever u want to recover a class match the Id and get the corresponding class
that is the best way to solve ur problem
Regards
kamal

Class object

Similar Messages

Maybe you are looking for