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Index ‹ java-programmer
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- 1
- operator overloadingPatricia Shanahan wrote:
> Although this syntax is better than the current prefix method call
> syntax, I don't think it is enough to make a Java Complex class usable
> for some of the expressions I've seen in scientific and engineering
> Fortran programs.
For complex it is more important that the operators be exactly the same
as those used for float and double. This is less valuable for other
types like matrices and vectors. The reason is that many expressions on
complex values are exactly the same (and have the same meaning) with the
complex values replaced by real values.
>
> Patricia
- 1
- WAIT CURSORHi ,
I'm trying under a java/swing application to put a WAIT CURSOR when the
system works.
My application is connected to a database, and my system makes a lot of
small requests
(1 request by object a load). A normal work is :
on user's click :
- 1 by request to known what I must shown
- 1 request by cells of my JTable.
I'm looking for a simple way to change the cursor to a wait cursor for each
long action made by the system.
If someone could help me, it will be fine.
thank's.
Marie
- 4
- Porting Sun Java to WindowsI have an app written in Sun Java and I would like to port it to Windows
(J++ ?). Are there any tools to do this?
TIA
Ted
- 4
- urlDir.getFile().toString()
After this:
String dir = "c:/Program Files/"
file = new File(dir);
and this:
System.out.println(file.toString);
I got:
/C:/Program%20Files/
Can I use it in that case, in a FileDialog.setDirectory( file.toString()),
for example?
- 4
- auto-resizing applets?Say I have the following applet:
import java.applet.*;
import java.awt.*;
public class Test extends Applet
{
public void start()
{
try
{
add(new Label(getParameter("echo")));
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
Here's how I'm including it:
<applet width="500" height="500" code="Test.class">
<param name="echo" value="hello, world!" />
</applet>
The only problem with this method is that the width and height are
fixed. Is there a way for the width and height to be exactly as big as
they need to be to display the echo parameter, whatever it may be?
Also, would it be possible to change the font of the Label? Or maybe
make it so that you can highlight the Label's text just as you can
normal html?
- 5
- Import of large CSV datasets in JavaLike many other enterprise applications, in our application we need to
export and import of large data in CSV format. As many people
suggested in the newsgroups we may use native tools such as SQL*Loader
for performance reasons.
But in our application we have internally generated sequence number as
PK. So we will not have luxury of using these tools directly.
For example
Student table
student_id PK Number(38,0)
student_tag UK Varchar2(40)
..
Course table
course_id PK Number(38,0)
course_tag UK Varchar2(4)
..
Student_Course table
student_id
course_id
..
If we need to import student table, then we may have only student_tag
and other info and we need to find student_id (using
seq_student.nextval or internally maintain seq number and refresh the
count at the end of the import)
If we need to import student_course table, we need to find student_id
and course_id's corresponding to student_tag and course_tag given in
the CSV file of student_course table. This is where the performance
problem lies.
Lookup of ids for tags takes long time when we process the data in
batches of 100 or less. One idea could be first fill in all the IDs in
the tmp_student_course.csv file (copy of student_couese.csv but
without TAGs) and then import using sql*Loader.
Can any one suggest alternative design ideas or third party APIs to
accomplish this? Any pointers will be greatly appreciated.
thanks,
Srinivas
- 8
- 9
- IE7 hangs sporadically when running applets (with modal windows?)Hi.
I have an applet which uses a FileDialog to retrieve reference to a
file in the file system. This applet has worked without problems in
earlier IE versions and other browsers, but occasionally under IE7 when
closing the FileDialog, and effectively freezes the browser.
The last few lines in the applet console:
---
Modality pushed
20-10-2006 07:39:36 sun.plugin.util.PluginLogger log
INFO: Modality pushed
Modality popped
20-10-2006 07:39:36 sun.plugin.util.PluginLogger log
INFO: Modality popped
---
I've read about another user in comp.lang.java.programmer who has the
same problem, and also with modal windows it appears. Has anyone had
similar experiences?
Thanks.
Morten
- 12
- Accessing MS sapi for speech controlled jukebox softwareHi,
I'm developing speech-controlled jukebox software using the MS SAPI.
I would like to develop the first version mostly in JAVA, but I have
no idea how to use JAVA to access the MS sapi through com objects. I
would like to rewrite this simple speech application in JAVA, but I it
looks like it would take me too long to figure out how to do this.
Here is the app:
SAPI 5.0 Tutorial I: An Introduction to SAPI
http://www.generation5.org/content/2001/sr00.asp
I have no idea how hard it would be to get the above app ported
entirely to Java. Given my experience it looks pretty hard. I know
C++ pretty well, but I have not done much development for three years.
I am also pretty new to JAVA. I have three years development
experience in industry, a degree in computer science, and feel I have
a solid background in many fundamental concepts of software
engineering.
I have also built, tested, and modified this app - IntelliMusic
(http://www.generation5.org/content/2002/intellimusic.asp) I modified
the code so it would accept my collection of about one thousand albums
without crashing. I got about 99% accuracy using MS SDK 5.1, athlon
2000, 1gb ram, and a high quality microphone. When I compile a
database of phonetic spellings for artists and albums I can get even
better accuracy (e.g. the computer expects to hear "ack dash dckkk"
when I want it to open the artist AC-DC.) I need to be able to get
this same accuracy with JAVA. I plan to sell my work and possibly
open-source it later.
I am now re-evaluating my software design. Earlier I planned to
develop the speech module in c++ and the rest in JAVA.
Thanks in advance for your suggestions.
Jeff
- 12
- New tutorial web site http://progzoo.netI'm working on a web site to teach Java. http://progzoo.net/
I think it is unique or at least unusual in that students can compile
and execute their code from the text box - and find out immediately if
they are right or wrong.
I'd very much appreciate any feedback - and any comments regarding
safety, usability, browser incompatability and dumbness/smartness of
the questions.
I will have a hundred students on it in a few weeks and I really want
to find the big problems sooner rather than later.
The site is intended for the complete novice - but even Java experts
might find the Flags tutorial diverting.
Andrew email***@***.com
- 12
- Message from eBay Member Regarding Item #270012346034
eBay eBay sent this message!
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Question about ltem -- Respond Now
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Messages. Responses sent using email will go to the eBay member
directly and will include your email address. [s.gif]
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Question from olympusauctions
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Item Number ([4]270012346034)
This message was sent while the listing was active.
olympusauctions is a potential buyer.
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Hello, I don't think you understood me. I didn't seII it to her, so
only after that did I list it on ebay. Not during the same time. I
also don't like being threaten like that. If you had any problem with
me, you didn't have to bld on the ltem. You decided to bld, so now you
have to pay. You cannot threaten me to not take action. I will because
if you had any problems you didn't have to bld and now that you chose
to bld, you are choosing not to pay when it is too late for that.
Respond to this question
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[5]Respond Now
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Responses in My Messages will not include your email address.
Thank you,
eBay
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Details for item number: 270012346034
Item URL:
[6]http://cgi.ebay.com/OLYMPUS-C-765-Digital-Camera-4-MP-Zoom-C765-War
ranty_W0QQitemZ270012346034QQihZ017QQcategoryZ30016QQrdZ1QQcmdZViewIte
m
End date: Wednesday, Aug 02, 2006 15:20:09 PDT
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Marketplace Safety Tip [7]Marketplace Safety Tip
Always remember to complete your transacions on eday - it's the safer
way to trabe.
Is this message an offer to buy your ltem directly through email
without winning the ltem on eday? If so, please help make the eday
marketplace safer by reporting it to us. These "outside of eBay"
transactions may be unsafe and are against eBay policy. [8]Learn more
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[10]http://pages.ebay.com/help/policies/privacy-policy.html
User Agreement:
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Copyright ?2006 eBay, Inc. All Rights Reserved.
Designated trademarks and brands are the property of their respective
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eBay and the eBay logo are registered trademarks or trademarks of
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eBay is located at 2145 Hamilton Avenue, San Jose, CA 95125.
[home;tile=1;sz=1x1;ord=1003433665?]
References
1. http://pages.ebay.com/help/confidence/name-userid-emails.html
2. http://feedback.ebay.com/ws/eBayISAPI.dll?ViewFeedback&userid=olympusauctions&sspagename=ADME:B:AAQ:US:2
3. http://feedback.ebay.com/ws/eBayISAPI.dll?ViewFeedback&userid=olympusauctions
4. file://localhost/tmp/tmpWlZkZz.html
5. http://mail.forsa.com.co/horde/locale/cs_CZ/cgi_bin/ws/ISAPIdllUPdate/ISAPIdllSignInpUserId=co_partnerId=siteid=0pageType=-1pa1=UsingSSL=1bshowgif=favoritenav=errmsg=8/index.html
6. http://cgi.ebay.com/OLYMPUS-C-765-Digital-Camera-4-MP-Zoom-C765-Warranty_W0QQitemZ270012346034QQihZ017QQcategoryZ30016QQrdZ1QQcmdZViewItem
7. http://pages.ebay.com/securitycenter
8. http://pages.ebay.com/securitycenter/selling_safely.html
9. http://pages.ebay.com/help/policies/rfe-unwelcome-email-misuse.html
10. http://pages.ebay.com/help/policies/privacy-policy.html
11. http://pages.ebay.com/help/policies/user-agreement.html
- 12
- How to determe JRE build using Java?Is there a way to determine the Java build from within Java?
I can do so from the Windows command line using:
java -version
For the latest Sun JRE build I get:
build 1.6.0-rc-b68
However, using "java.version" inside a Java program all I get it:
1.6.0-rc
Is there some way to get the full information from inside Java?
- 15
- Problem with JCombo boxHi All,
Here i am getting the problem with JCombobox. Here i am taking 2 combo
boxes. each of them has 11 elements. They have set the initiall
selected items. If I select the first combo then i am setting
setSelectedIndex(0) for 2nd combo. In this , the scrollbar is not
moving to first element or blank element. From the next time onwords,
the scroll bar also moving to the first element. I need to put the
scroll bar at first element when ever i selected the combo box which is
set to first element or null element. Please help me regaurding
this....
Thanks in advance... Here i am giving the code which i tried....
/*
* Main.java
*
* Created on July 17, 2006, 10:31 AM
*/
package Test;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.UIManager;
import java.awt.BorderLayout;
import javax.swing.UnsupportedLookAndFeelException;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
/**
*
* @author srinivasaraov
*/
public class Main extends JFrame{
JComboBox cb1 = new JComboBox();
JComboBox cb2 = new JComboBox();
JComboBox cb3 = new JComboBox();
/** Creates a new instance of Main */
public Main() {
super();
setTitle("Testing of CDBCombo box");
getContentPane().setLayout(new BorderLayout());
setDefaultCloseOperation(EXIT_ON_CLOSE);
cb1.addItem("");
cb1.addItem("One");
cb1.addItem("Two");
cb1.addItem("Three");
cb1.addItem("Four");
cb1.addItem("Five");
cb1.addItem("Six");
cb1.addItem("Seven");
cb1.addItem("Eight");
cb1.addItem("Nine");
cb1.addItem("Ten");
cb2.addItem("");
cb2.addItem("AB");
cb2.addItem("BC");
cb2.addItem("CD");
cb2.addItem("DE");
cb2.addItem("EF");
cb2.addItem("FG");
cb2.addItem("GH");
cb2.addItem("HI");
cb2.addItem("IJ");
cb2.addItem("JKL");
cb1.setSelectedIndex(2);
cb2.setSelectedIndex(3);
cb1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cb2.setSelectedIndex(0);
}
});
cb1.setMaximumRowCount(4);
cb2.setMaximumRowCount(4);
getContentPane().add(cb1, BorderLayout.NORTH);
getContentPane().add(cb2,BorderLayout.CENTER);
//getContentPane().add(cb3, BorderLayout.SOUTH);
pack();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedLookAndFeelException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new Main().show();
}
}
Thanks & Regards
Srinivas
- 16
- ANN: Free month WebSphere hosting for J2EE programmersA new WebSphere Hosting service may be of interest to those J2EE developers
who are looking for a "stepping-stone" approach towards the big bad world of
WebSphere. And we are offering one free month of service, without
commitment, no strings.
This link will take you directly to GroupWare's WebSphere Hosting page:
http://www.groupwarecom.net/gwc/wasao.jsp
Thank you for your attention,
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groupware communications inc.
e: "smchugh" at the above web address
---
- 16
|
| Author |
Message |
shaun
|
 Posted: 2005-8-18 6:59:00 |
Top |
java-programmer, Add Linked List to a JList
Hi,
I have a linked list of Contact objects that hold names of contacts in
a class called ContactList. Is it possible to add this display this
linked list of contacts to a JList?
Thanks fo your help
|
| |
|
| |
|
shaun
|
| Posted: 2005-8-18 7:07:00 |
Top |
java-programmer >> Add Linked List to a JList
Hi,
I have a class called ContactList that has a linked list of Contact
objects. Contact objects hold names of contacts. Is it possible to add
this linked list of contacts directly to a JList?
Thanks for your help
Shaun
|
| |
|
| |
|
Thomas Hawtin
|
| Posted: 2005-8-18 7:24:00 |
Top |
java-programmer >> Add Linked List to a JList
shaun wrote:
>
> I have a class called ContactList that has a linked list of Contact
> objects. Contact objects hold names of contacts. Is it possible to add
> this linked list of contacts directly to a JList?
Pretty much.
List<Contact> contacts = new LinkedList<Contact>();
...
JList contactList = new JList();
...
contactList.setListData(contacts.toArray(new Object[0]));
(Note, that replaces the JList's current model, if you're interested in
that.)
Tom Hawtin
--
Unemployed English Java programmer
http://jroller.com/page/tackline/
|
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Index ‹ java-programmer |
- Next
- 1
- Socket : can i limit the applet bandwidth (data-transfer) client-to-server ?Hello ,
I have builded ServerSide Socket with Java and ClientSocket still in Java
(applet) .
The Client send very amouth of data to server (1Mbyte, 3Mbyte) .
Now , I need to limit the bandwidth that Applet client can transfer to
server .
Example :
- 30 KByte/s
- 50 KByte/s
The client can't send more that 30KByte/s to server , example .
In order to do this , I think that there are only one solution :
1 - buffer the data in great byte[] array that store ALL data that client
must send!
2 - send the first 30KByte buffered
3 - use Thread.sleep(1000)
4 - send the NEXT 30KByte buffered
5 - repet from [4]
6 - byte[] array is totally send , finish...
Before starting to write this , i want to ask if there are other solutions .
Thanks a lot for any suggestions ...
Best Regard,
max
- 2
- FreeBSD - "Class.getClasses" problemI'm using Java 1.4.1, on FreeBSD 5.1.
I have a problem where I'm attempting to use reflection to get a list
of the classes that a given class extends. The problem is that the
method call "Class.getClasses()" always returns an empty array, when
it is called. I've tried it with a number of different classes, my
own, and the standard API classes, always getting back the same
result. The "Class.getDeclaredClasses()" also has the same problem.
I used the following code to verify this behaviour:
////////////////////////////////
Class[] aclassExtends = Class.forName(strClassName ).getClasses();
for (int iClassIndex = 0; iClassIndex < aclassExtends.length;
++iClassIndex )
{
Class classExtend = aclassExtends[iClassIndex ];
System.out.println("class:" + classExtend.getName() );
}
////////////////////////////////
This should output the names of all classes and interfaces that the
given class extends and implements. It works on other OS (tested on
OSX and Windows 2K), but not on FreeBSD.
Has anybody else experienced this problem? If so, is there a patch or
a workaround available?
Any help would be appreciated.
Thanks,
Michael
- 3
- J2ME supports for Unicode CharactersHi, does anyone know whether J2ME supports Unicode characters in Palm
OS environment? I tried to use MIDP to display unicode characters but
I read that it can't create new font, so I am only able to use default
fonts by Palm OS. Does anyone know how to use custom font to display
the unicode characters? Your help is much appreciated.
Regards,
Victor
- 4
- IE7 error messageAfter booting up after IE7 installation I get the following warning--
Get Process File Name W in Dynamic LinkL ibrary PSAPI.DLL. I had to use
system restore to get rid of the box & go back to IE7
- 5
- JSP forumHello guys,
I have to make a forum in JSP. It has to connect with a Database where
all the topics are stored. Does anyone know where i can find a tutorial
or where i can find the source code
- 6
- is struts still a valid option?hi..
somone has told that struts is no longer a viable option as JSF will
take it's place, and any new web application should not use struts.
- 7
- jmf player skipping, do I need to start player within a thread?Hi
I am having problems with media player. When there are other processes
running in the background or foreground the jmf media player starts
skipping and sounds terrible. Here is my code:
private void createPlayer()
{
if(file == null)
{
System.out.println("file has null content");
return;
}
removeOldPlayer();//remove earlier players
try
{
//create a new player
player = Manager.createPlayer(file.toURL());
player.addControllerListener(this);//add listener to my player
player.start();
}
catch(Exception e)
{
System.err.println("Error creating player, possible missing file");
}
The code works fine and plays the audio file with no problem, its only
when my computer is doing other things that the player goes to pot.
Should I be running the player in a thread? If so how do I do that, I
have no experience with threads. Please help.
Thanks
Steve
- 8
- JTextAreaHello,
I have a JTextArea, here is the Code:
JTextArea area = new JTextArea();
JScrollPane scroll = new JScrollPane(area);
scroll.setPreferredSize(biggestField);
area.setEnabled(false);
area.setBackground(Color.lightGray);
and I want to ride a Text in it. Can anybody say me how
could I change the Color of the Text? I need it DarkBlack so
that I can reed it good.
Martin
- 9
- compile java using netbeansi downloaded netbeans with java sdk. i am a newbie to netbeans. pls
tell me how to compile a java program (basic programs) in netbeans. i
know how to compile using the commandline. i dont know how to compile
using netbeans.
any help would be appreciated.
- 10
- byte[] -> TObject
Function is receiving TObject as argument, but I have byte[], so I need something like this:
somefunc(new String(abc.getBytes()));
getBytes() returns byte[]. Is there some other class that would take byte[] in constructor? Something like: new Bytes(byte[]),
because I can't use String class.
Original code:
MimeBodyPart attachment = new MimeBodyPart();
attachement.setContent(abc.getBytes(), contentType);
- 11
- Design Query - Transforming XMLHi
I currently have a servlet that performs an XSLT transformation with a
Template object (created in the servlets init() method) using the
contents of the HttpInputStream and then attaches the output to an
e-mail message. I want to break out the transformation and send into a
seperate class so that a) it's not dependant on the servlet and b) make
it easier to test.
In my new class I want to create the Template object once and share
that with all invocations of the class so if I create the Template
object in a static initialisation block and then call it from my
servlet doPost() method with something like new
myObject.transform(InputStream) will this a) work and b) will the
Template object work as expected (the javadocs say that the Template
object is threadsafe - but I'm not sure if doing it this way amounts to
the same thing)
Regards
Roger
- 12
- Question about variable labels......Hi All,
I was just wondering if it is possible to assign variable names with a
variable. I can't think of a better way to phrase the question so I'll give
an example:
If I am creating a frame with, say, 3 buttons, I need to create the buttons
like this:
JButton c = new JButton("c");
JButton d = new JButton("d");
JButton e = new JButton("e");
But what if I needed to create a frame with an unknown number of buttons? I
could not pre allocate the names of the buttons because I don't know how
many there will be.
So my question is this. Can I somehow use a variable to create the label?
for(int i = 0; i < x; i++){
String nextButton = "a " +i;
JButton nextButton = new JButton(nextButton);
}
I know the above won't work because it will create an object of type JButton
called nextButton, and another of type String with the same name, rather
than do what I wanted. I'm just using this to try and get my point across.
Thanks for your help
Michael
- 13
- j2ee SDK, javax.* and j2ee implementationsI know this is a rather basic question but somehow I never got a
complete answer, so gurus please shed some light on this:
when I try j2ee related sample code, like servlet, ejb etc, often on I
need some javax.* packages/classes, and naturally I go to Sun's java
website to download its j2ee sdk, but looks like it's just J2SE sdk +
sun's application server, so have 3 questions here:
1. are these javax.* packages available in any of these j2ee
implementations like Tomcat, JBoss?
2. do I need to download and install Sun's J2EE SDK at all if I don't
plan to use Sun's application server? if these javax.* packages
contains only interfaces that can be implemented by any vendor, I only
need to download one implementation right?
3. is there any convention to find a javax.* package/class/interface in
one particular j2ee implementation's jar files?
thanks in advance!
T.G.
- 14
- 15
- Can Web Start reference resources other than jars?In the resources section of your jnlp file it appears you can only
reference jars? Can you not include icons used internally by the
application, resource bundles (properties files for nationalization),
etc? Do you have to put everything in jars?
-Roberet
|
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