Simple OOPS question

1. what is the difference between creating an Object
Reference and creating an Object ??
2. An Interface may have only data members defined in
it excluding member functions. What is the advantage
with these kind of Interfaces ??
For example in Java we have Serializable and Remote
Interfaces.

hi
1) JFrame frame = new JFrame();
JFrame frame2 = frame1;
frame is a Instance,frame2 is a object Reference
if you modify frame2, frame is modified too.
2) Interfaces define a set of methodes and/or constants
for all user of classes that implement this interface
the classes can have more methodes than the interface
define, but not a subset.
The implementation me be different in every class but must match the methode signature of the interface
zb interface tablemodel : java must make shure that a table have a model with all mehodes of the tablemodel
becurse java calls methodes of the tablemodel and must find this methodes -this ensure the interface

Similar Messages

Error in simple oops program

Hi experts,
When executing a simple oops program ..i got the following error. Please correct the code.
"VAR" is not type-compatible with formal parameter "I_DATA".
      CLASS main DEFINITION
CLASS main DEFINITION.
PUBLIC SECTION.
    "// Instance Methods ( Note we use the statement 'METHODS'
    "// to define an instance method )
    METHODS set_data IMPORTING i_data TYPE string.
    METHODS get_data RETURNING value(r_data) TYPE string.
    METHODS print_attribute IMPORTING i_data TYPE string.
    "// Instance Methods ( Note we use the statement 'CLASS-METHODS'
    "// to define a static method )
    CLASS-METHODS set_classdata IMPORTING i_data TYPE string.
    CLASS-METHODS get_classdata RETURNING value(r_data) TYPE string.
    CLASS-METHODS print_classattribute IMPORTING i_data TYPE string.
PROTECTED SECTION.
    "// Instance Attribute ( Note we use the statement 'DATA'
    "// to define an instance attribute )
    DATA attribute TYPE string.
    "// Static Attribute ( Note we use the statement 'CLASS-DATA'
    "// to define a static attribute )
    CLASS-DATA classattribute TYPE string.
PRIVATE SECTION.
    "// Instace event ( Note we use the statement 'EVENTS'
    "// to define aN instance event )
    EVENTS event EXPORTING value(e_data) TYPE string.
    "// Instace event ( Note we use the statement 'CLASS-EVENTS'
    "// to define a static event )
    CLASS-EVENTS classevent EXPORTING value(e_data) TYPE string.
    "// For more informations about events see the following example:
    "// ABAP Objects - Creating your First Local Class - Using Events
ENDCLASS.                    "main DEFINITION
      CLASS main IMPLEMENTATION
CLASS main IMPLEMENTATION.
METHOD set_data.
    CONCATENATE 'Instance Attribute value' i_data
                               INTO attribute SEPARATED BY space.
ENDMETHOD.                    "set_data
METHOD get_data.
    MOVE attribute TO r_data.
ENDMETHOD.                    "get_data
METHOD set_classdata.
    CONCATENATE 'Static Attribute value' i_data
                               INTO classattribute SEPARATED BY space.
ENDMETHOD.                    "set_classdata
METHOD get_classdata.
    MOVE main=>classattribute TO r_data.
ENDMETHOD.                    "get_classdata
METHOD print_attribute.
    WRITE: i_data, /.
ENDMETHOD.                    "print_attribute
METHOD print_classattribute.
    WRITE: i_data, /.
ENDMETHOD.                    "print_classattribute
ENDCLASS.                    "main IMPLEMENTATION
DATA: var type char20.
START-OF-SELECTION.
"// Calling a Static method (note we don't have a object )
"// instead we use the <class name>=><method name>.
main=>set_classdata( 'SDN' ).
var = main=>get_classdata( ).
"// Print the var value
main=>print_classattribute( var ).
DATA: object_reference TYPE REF TO main.
CREATE OBJECT object_reference.
"// - Calling a Instance Method( Note we have to use a object to
"// access the insntace components of class main )
"// - Note we're using the statment "CALL METHOD", see looking for
"// functional & General methods for more informations
CALL METHOD object_reference->set_data( 'BPX' ).
var = object_reference->get_data( ).
object_reference->print_attribute( var ).
Thanks in Advance.
Regards
Nani

Hi Nani,
try changing your data definition for var from CHAR20 to STRING.
regards,
Peter

Simple/silly question: how do I set/change default font/color for outgoing mail messages?

Simple/silly question: how do I set/change default font/color for outgoing mail messages?

Just a suggestion..........
Download Thunderbird. Easier to use when it comes to what you want to do w/your emails.

4 Simple Flash Questions that Are Stumping Me!

What is the Frame Rate for Web Animations
Q1. I am making an animation which will be played on the web. What is the default frame rate (fps) of Flash CS5? And what is the frame rate of for web?
Q2. My animation needs to be 30 seconds long. So at 15 fps that would mean I need to use 600 frames in Flash?
How Do I Mask everything so all I see is the Content on the Stage?
I have a wide image that extends past my movies stage size so when I preview my movie the image is visible. How do I mask out anything that extends past my movies window size? I believe I can create a layer named "mask" and place it above all other layers, but I forget how to make the mask. Any help is appreciated.
How to Fade a Graphic
I have a graphic element (some type) and I want it to fade from 0% to 100%. In older versions of Flash I could just select the symbol and then set it's alpha value to 0%, move a few keyframes and then set the alpha to 100%. Voila! but now it doesn't seem to work that way. How can I do this in CS5?

Ned, it says 24 fps which means there is 24 frames per second so each 24 frames is 1 second.
Date: Fri, 4 Nov 2011 05:35:16 -0600
From: [email protected]
To: [email protected]
Subject: 4 Simple Flash Questions that Are Stumping Me!
    Re: 4 Simple Flash Questions that Are Stumping Me!
    created by Ned Murphy in Flash Pro - General - View the full discussion
1 You can create your character as a movieclip and copy/paste that movieclip from one file to another. 2. One way to create a movieclip is to copy all the frame of the animation's timeline (select them all, right click the selection, choose Copy Frames), then create a new movieclip symbol (Insert -> New Symbol...etc) right click on its only keyframe and chhose Paste Frames. THat will put all the layers and frames you copied into the movieclip The only way to come close to being certain about the timing of you animation is to use code to keep track of the time, something like getTimer().. The frame rate that a file plays at is not a reliable means of dictating the time it takes due to a variety of factors which include the amount of content you are trying to process and performance limits of the user's machine.
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     Start a new discussion in Flash Pro - General by email or at Adobe Forums
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Simple performance question

Simple performance question. the simplest way possible, assume
I have a int[][][][][] matrix, and a boolean add. The array is several dimensions long.
When add is true, I must add a constant value to each element in the array.
When add is false, I must subtract a constant value to each element in the array.
Assume this is very hot code, i.e. it is called very often. How expensive is the condition checking? I present the two scenarios.
private void process(){
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
    for (int iiii=0;iiii<dimension1;iiii++)
         if (add)
         matrix[i][ii][iii][...] += constant;
         else
         matrix[i][ii][iii][...] -= constant;
private void process(){
if (add)
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
    for (int iiii=0;iiii<dimension1;iiii++)
         matrix[i][ii][iii][...] += constant;
else
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
    for (int iiii=0;iiii<dimension1;iiii++)
       matrix[i][ii][iii][...] -= constant;
}Is the second scenario worth a significant performance boost? Without understanding how the compilers generates executable code, it seems that in the first case, n^d conditions are checked, whereas in the second, only 1. It is however, less elegant, but I am willing to do it for a significant improvement.

erjoalgo wrote:
I guess my real question is, will the compiler optimize the condition check out when it realizes the boolean value will not change through these iterations, and if it does not, is it worth doing that micro optimization?Almost certainly not; the main reason being that
matrix[i][ii][iii][...] +/-= constantis liable to take many times longer than the condition check, and you can't avoid it. That said, Mel's suggestion is probably the best.
but I will follow amickr advice and not worry about it.Good idea. Saves you getting flamed with all the quotes about premature optimization.
Winston

Simple OOP Problem. Help!

This is just a simple OOP problem that i cant decide on a best
implementation for.
im passing an object to an instance of, 'TabbedFrame', which is just
a frame with a Tabbed Pane in it that is holding custom panels.
however, these custom panels need access to the object being
passed to 'TabbedFrame' and to some methods in it.
i cant make them static however so how do i gain access to them?
is my only option to pass the 'TabbedFrame' to each panel?
like - jtabbedpane.add( "Panel 1", new mypanel1(this));
here is code:
new TabbedFrame( DataObject );
public class TabbedFrame{
public TabbedFrame(DataObject do){
this.do = do;
jtabbedpane.add( "Panel 1", new mypanel1() );
DataObject do;
public class mypanel1{
public mypanel1(){
// need access to DataObject of the 'TabbedFrame' object that instantiated
// this 'mypanel1' and to some of its methods
}i would just pass the DataObject to evey panel (there are 12) but
i also need to be able to call methods in the 'TabbedFrame'.
Any help would be appreciated!

Modify mypanel1's constructor:
public class mypanel1{
TabbedFrame tf;
public mypanel1(TabbedFrame tf){
this.tf = tf;
// need access to DataObject of the 'TabbedFrame' object that instantiated
// this 'mypanel1' and to some of its methods
DataObject theDo = tf.getDataObject();
tf.someMethod(); // Call method on the TabbedFrame
}In TabbedFrame:
public TabbedFrame(DataObject do){
this.do = do;
// Modify call to constructor to pass "this" TabbedFrame.
jtabbedpane.add( "Panel 1", new mypanel1(this) );
}

A few simple Logic questions...please help.

I have a few probably simple Logic questions, that are nonetheless frustrating me, wondering if someone could help me out.
1. I run Logic 8, all of the sounds that came with logic seem to work except organ sounds. I can't trigger any organ sounds (MIDI) on Logic, they won't play. I have a Yamaha Motif as my midi controller.
Any idea why?
2. I've starting running into a situation where I will record a MIDI track, the notes are recorded but they won't playback. The only track effected is the one that was just recorded. All other midi tracks playback.
I have to cut the track, usually go out of Logic and back in, re record for it to playback properly. Any idea why this may be happening?
3. How important is it to update to Logic 9. Are there any disadvantages down the road if I don't upgrade. If I purchase the $200 upgrade, do I get a package of discs and material, or it just a web download.
Any help is appreciated!
Colin

seeren wrote:
Data Stream Studio wrote:
3) You get a full set of disks and manuals.
They're including manuals now?
I think his referring to the booklets ...on how to install etc
It would be great to see printed manuals though ...I love books especially Logic/Audio related !!
A

Simple Quick Question

wrong section, post was moved.
Message was edited by:
Rob17

you titled "simple quick question"...
.. complicated to answer..
a) the TermsOfUse of the iTS don't allow any processing of purchased files, these are "copy protected"..
b) iM has a voice-over function..
c) iM is a video-edit app.. easy to use... just learn to handle it...
d) iM allows to "extract" audio (=muting the original audio, adding your own..)
e) to learn iM, spend some time here: http://www.apple.com/ilife/tutorials/imovie/index.html
f) use pencil and paper first! WRITE and scribble, what shall happen when in your movie/parody... make a script, draw a storyboard .. THEN launch iM.. in other words: think first, then edit.. iM is just a tool, it does not "create"... Picasso needed a papertowel and half a stencil to create art....
g) to get comfortable with iM, start with your own, small, short (3min!) project... import some stills, edit them, add a funny voice-over, add sounds, add music... good? make a bigger one...
h) .. in our Lecture II, we teach you how to import shows from TV, youtube, wherever..
standard disclaimer:
be nice to ©opyrights ...

Simple query question

hi all,
I have a XMLType table with one column - I have presently one row, in my column xmlsitedata I have stored one large xml file.The schema definition is given below:
<?xml version="1.0" encoding="UTF-8" ?>
- <xs:schema elementFormDefault="qualified" attributeFormDefault="unqualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
- <xs:element name="siteList">
- <xs:complexType>
- <xs:sequence>
<xs:element name="site" type="siteType" minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>
- <xs:complexType name="siteType">
- <xs:sequence>
<xs:element name="nameEn" type="xs:string" />
<xs:element name="nameFr" type="xs:string" />
</xs:sequence>
<xs:attribute name="code" type="xs:string" />
</xs:complexType>
</xs:schema>
I have executed the query below:
select x.XMLSITEDATA.extract('/siteList/site/nameEn/text()').getCLOBVal() "stName" from wsitelist x;
and I get all english names of some 200 locations, however, there is 1 row selected and all names show up on one row. How do I split them into 200 or whatever rows?
Thanks,
Kowalsky

Have a look at the answer provided in the following thread.
very simple XML question
This may solve your problem.
use xmlsequence.
Alvinder

A general OOP question

Hi
I have a general OOP design question, and am wondering if someone could relate an answer to the following design?
I have a class called MediaFolderImport(); - it's designed to build a window with various editing tools in it.
Within it's constructor, I'm calling a bunch of functions to build the window...
   createTitle();
   createInstructions();
   createToolPanel();
   createDataGrid ();
   createOpen();
   createSave();
In my document class, I instantiate it...
public var File_Folder_Import:MediaFolderImport=new MediaFolderImport();
and then...
addChild(File_Folder_Import);
Voila! - the window appears. I WAS very proud of myself.
Now I want to access something inside the window. Specifically, there's a radio button that was created in createToolPanel(); - I want to update it to be selected or not selected when I receieve the user's preference from an xml settings file at start up (xml is loaded into the doc class).
General question:
What is the best practice, smart way to have designed this?
- call createToolPanel(); from the doc class instead of within MediaFolderImport();, and somehow (magically) have access to the radio button?
- leave the design as is, but add some sort of listener within MediaFolderImport that listens for changes to the xml in the doc class, and updates accordingly?
- do it the way I'm trying to, ie try to access the radio button directly from the doc class (which isn't working):
File_Folder_Import.myRadioButton.selected = true;
- a better way someone can briefly explain the concept of?
Another way to explain my design is...
- a bunch of different windows, each created by a different class
- xml file loads preferences, which need to be applied to different tools (radio buttons, check boxes, text fields etc) in the different windows
I read a lot of posts that talk about how public vars are mostly bad practice. So if you are making your class vars private, what is the best way to do the kind of inter-class communicating I'm talking about here?
I think someone throwing light on this will help me solidify my understanding of OOP.
Thank you for your time and help.

You're already very used to using properties for the built-in AS classes and that's the best practice means of configuring your class. It's a "state" that you want to simply expose. The get/set method moccamaximum mentioned is the ideal route.
The main reason you want to use get/set functions is validation. You want your class to act properly if you send an invalid value. Especially if anyone else besides yourself is going to use the class. Plan for the worst.
The general concept is, make a private variable for any 'state' you want to remember using an underscore in the variable name to easily identify it as a private var, then make get/set functions with the same name with any required validation without the underscore.
e.g.
package
     public class MyClass
          // property called 'mode' to track something with an int
           private var _mode:int = 0;
          public function MyClass() {} // empty constructor
          // get (type enforced)
          public function get mode():int { return mode; }
          // set, requiring a value
          public function set isChecked(modeVal:int):void
               // if no value is sent, ignore
               if (!modeVal) { return; }
               _mode = modeVal;
Your validation will go a long way to easily debugging your classes as they grow in size. Eventually they should throw exceptions and errors if they're not valid. Then you will be best practice. Do note that if your validation requires quite a bit of logic it's common to upgrade the property to a public method. get/set should be reserved for simple properties.

Simple Report Question

Post Author: scott123
CA Forum: General
I want to take the information in a simple excel table and recreate it 3 times, each time sorting/grouping on a different columnHere is the tableAnd here is the report that I'm trying to generate (first sorted by name, alphabetically, then grouped by rank, then grouped by size) I'm comfortable working with excel tables in Crystal, but I'm running into a problem repeating the information and then sorting each group separately. I also have no problem doing each group in a single report (without repeating any records), but I'd like to include all 3 groups in a single report. My apologies for how remedial this question is- I thought for sure that Crystal could do this easily but I've spent a couple of days on this and am running into a brick wall.

Post Author: pandabear
CA Forum: General
That's right Scott, and maybe make them "on demand"
sub reports so the user only has to see the data they
really want at the moment. Gives the report a nice clean look too.
PB

A simple security question

I'm trying to write a simple self-signed applet that use a jca provider but thi exception "java.security.SecurityPermission putProviderProperty.BC" is thrown. if I use a policy file, it works fine but for a beginner user is not very useful intall a new policy file.
After this I tried to write a new self-signed applet that read a file and open a ServerSocket on port 21, and it work fine without a new policy file!
My question is this: why is needed a policy file to add a provider and not to open a ServerSoket or read/write a file???????
PS
if u have an idea to resolve my problem without a policy file, tell me pls!!! IT'S URGENT!!

An applet works out of a so-called sandbox. The security restrictions can be overcome in one of two ways that you have tried:
1) by the use of a policy file, or
2) by signing the applet
So, to answer your question:
My question is this: why is needed a policy file to add a provider and not to open a ServerSoket or read/write a file???????Since the applet is signed, there is no need for a policy file......if you tried to access the socket without signing the applet, you'll get the security exception!
;o)
V.V.

A somewhat simple security question......

If a mac running macosx has two separate user accounts, lets say one admin and the other a standard user, or both admins or both standard users.....
Is it possible for a hacked/penetrated account on one of the users to affect or read any info from the other user on the same machine ?
What application is in question; Safari lets say.....

FLUIDNYC wrote:
So, disable all scripts and uninstall all plugins from the browser.
No java, No javascript, No plugins like flash, java, shockwave, quicktime, or adobe crap.
So, no functionality. What about that java applet I need to run 10 hours a day. Do you think I should go out of business over it? Or all my QT movies? Or, deprive myself of Flash, so I can't view the content of websites?
So, lets say you browse www.thissiteisinfected.com and have everything uninstalled (see above), and your smart enough to browse the web using a "STANDARD" user account and not the "ADMIN" user account.
Running from a standard user buys you nothing and adds additional steps. If you want to download an app, before you install, you will get a dialog warn you "XXXX is an application you downloaded from the internet..." So, you still have to authenticate. And what about *all the apps that need no authentication to install?*
You tell me how this website will inject crap into your MAC with the settings above???
There is no way to FORCE CODE into your browser if everything is disabled.
Tell me how it can "inject crap" into my "Mac" admin without my complicity.
I have bumped into a rouge antivirus website while on my macbook using safari.
All of a sudden a popup stated i had spyware, i could'nt close the box/window, I had to do a FORCE QUIT on SAFARI to get out of that page. It pretty much hijacked SAFARI.
This is nothing that can harm you. It is annoying having to force quit over it, but that is all.
My safari download settings place things on my desktop, sure enuff, there was a .EXE file sitting on my macbooks desktop.
Sure enough, your Mac can't do a thing with it.
NOTHING IS BULLETPROOF.
I agree but there are simpler ways to plant a rootkit you overlook, that have nothing to do admin accounts or ports. *The question is, who would want to?* Even if a black hat is randomly hunting for bank account numbers, social security numbers, credit card numbers, etc. he would pass up a UNIX based system with good protections in place for an easier target.
In short, in a home environment, I could never recommend running from a standard user. Especially if they are on a router and/or using OS X firewall. (The exception being if you have kids and want to use parental controls.) I have no idea how this mantra about using a non-admin account started, there is no place where Apple recommends this.
-mj

Simple Query Question - How do I return the Last 3 records of a Table?

Question.
For example, I have a table that has 50 records.
How do I, specify in SQL to only return the last 3 records of the table.
Select a.* from table a where ????

I was just trying to show an example to a friend on
how something like this would work and if it was even possible. But it won't work. Here's a simple example:
SQL> create table emp
2 (id)
3 as
4 select object_id
5 from   all_objects
6 order by object_id;
Table created.
SQL> select *
2 from (select rownum rn
3               ,b.*
4         from   emp b)
5 where rn > ( select (max(rownum) - 3)
6                from    emp)
7 ;
        RN         ID
     40830      55891
     40831      55892
     40832      55893So far, so good. These are the "last 3" rows inserted. Now delete a bunch of rows and insert 3 new ones:
SQL> delete emp where id < 40000;
33423 rows deleted.
SQL> commit;
Commit complete.
SQL> insert into emp values (60000);
1 row created.
SQL> insert into emp values (60001);
1 row created.
SQL> insert into emp values (60002);
1 row created.
SQL> commit;
Commit complete.
SQL> select *
2 from (select rownum rn
3               ,b.*
4         from   emp b)
5 where rn > ( select (max(rownum) - 3)
6                from    emp)
7 ;
        RN         ID
      7410      55891
      7411      55892
      7412      55893Here's the problem. Even though the "last 3 rows" are 60000 - 60002, I still get the same ones as the first query.

Simple Mail question (couldn't find Mail forum)

Sorry to ask this on iCal forum, but I saw no forums dedicated specifically for regular Mail.
This is a simple question as I am a new Mac owner: I am used to using gmail for my email, and like this primarily because, given that it is a web based email application, I can access my email from any computer, anywhere, anytime.
Given my new Mac, I am interested in switching to the Mail application and was wondering if there is any way to check my email when I am away from my home computer? I think this would work with a mobileme account, but I have not obtained one as of yet.
Any information would be greatly appreciated! Thanks...

Thanks Kosmoe...
One other question...if I do indeed create a new email account and use the Mail application for it, will I be able to check messages via the internet from any computer or only from my own?
And, if I want to be able to check from any computer, then it seems like getting a mobile me account would solve the problem, right? I am assuming mobile me email can be accessed from anywhere?
Sorry to be such a Mac newbie! But so far loving the whole Mac experience!

Simple OOPS question

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