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Index ‹ java-programmer
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- 1
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- 1
- JDialog dispose and application window poppingHello!
I have an application where I show a JDialog (sort of as a status
indicator). During this time, I launch an application like Excel
(which comes up successfully). Once that other application is
launched, I take down my dialog by calling dlg.dispose(). Note that
the user did NOT interact with that dialog.
After the dialog disappears, my application pops itself to be
frontmost. I cannot figure out how to make my application stop this
behavior. I want the second application (Excel in this case), to
remain in front.
I have been searching all over and cannot find any solution to this
problem. I do know its tied up with the dispose() because not invoking
it leaves things the way I want (except that my modal dialog is still
up).
Any pointers would be appreciated.
Allan
- 1
- 8
- Extracting c++ header from jar file using javahI'm trying to create a native header from an existing jar file
(actually, only one class w/in the jar file). I've tried all sorts of
command line arguments (w/ classpath) and nothing seems to work.
Here's the setup:
* package is blah.jar and contains dozens of classes, one of which I'm
interested in creating a .h for (blahClass.java)
* I have the source for it in another directory but its dependencies
are pretty large and I figure using javah on the .jar file would be
easiest?
* why wouldn't this work:
javah -classpath c:\temp\work\blah.jar blahClass
blahClass is also part of a larger package (net.program.message) so I
also tried:
javah -classpath c:\temp\work\blah.jar net.program.message.blahClass
nothing works.
any ideas? thx
- 8
- How to get jsp and servlet interaction.I need some help/assistance from someone with this problem of mine of
trying to get a jsp which displays a table with some table data in it,
i.e., some of my favorite movies, to interact successfully with a
servlet!!! Now, in the servlet, I have used--probably for the very 1st
time ever--the servlet method "RequestDispatcher" and both of the
getAttribute() and the setAttribute() methods, but alas, when I try to
view the jsp in my web browser, I only get the jsp title showing!!! Now
whasssssssssup with that anyway???!!
Here is first my servlet code :
/* Here is a particular servlet which is used with a jsp that will
* print out a movie list.
*/
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class MovieServlet extends HttpServlet {
public void service (HttpServletRequest request, HttpServletResponse resp)
throws IOException, ServletException {
PrintWriter out = resp.getWriter();
String [] movieList = { "Patton", "Some Like It Hot", "Bank
Shot","Beyond Atlantis", "Titanic"};
java.util.List mymovie = new java.util.ArrayList();
mymovie.add(movieList);
request.setAttribute("movieList", mymovie);
String[] items = (String[]) request.getAttribute("movieList");
for(int i = 0; i < items.length; i++){
String movie = items[i];
out.println(movie);
}
RequestDispatcher steve = request.getRequestDispatcher("mymovies.jsp");
steve.forward(request, resp);
}
}
and then my jsp code :
<%@ taglib prefix = "c" uri="http://java.sun.com/jsp/jstl/core" %>
<html><head>
</head><body>
<b><i>My Personal Movie List</b></i><br><br><br>
<table>
<c:forEach var = "movie" items = "${movieList}"varStatus =
"movieLoopCount"> >
<tr>
<td>Count : ${movieLoopCount.count}</td>
</tr>
<tr>
<td>${movie}</td>
</tr>
<tr><td>Patton</td></tr>
</c:forEach>
</table>
</body></html>
- 8
- Howto read newline characterHi,
I'm new to java and I'm writing a simple text editor using swt examples
from eclipse. The only problem I see is that my editor wont display the
text file correctly. It will display the whole text file in one line.
Here is the code I use to open file. I don't know where to start.
public class OpenFile extends SelectionAdapter {
public void widgetSelected(SelectionEvent event) {
FileDialog fileOpen = new FileDialog(shell, SWT.OPEN);
fileOpen.setText("Open");
String[] filterExt = { "*.txt", "*.ini", "*.*" };
fileOpen.setFilterExtensions(filterExt);
String selected = fileOpen.open();
if (selected == null) {
return;
}
FileReader file = null;
try {
file = new FileReader(selected);
} catch (FileNotFoundException e) {
MessageBox messageBox = new MessageBox(shell, SWT.ICON_ERROR | SWT.OK);
messageBox.setMessage("Could not open file.");
messageBox.setText("Error");
messageBox.open();
return;
}
BufferedReader fileInput = new BufferedReader(file);
String textString = null;
StringBuffer sb = new StringBuffer();
try {
do {
if (textString != null) {
sb.append(textString);
}
} while ((textString = fileInput.readLine()) != null);
} catch (IOException e1) {
MessageBox messageBox = new MessageBox(shell, SWT.ICON_ERROR |
SWT.OK);
messageBox.setMessage("Could not write to file.");
messageBox.setText("Error");
messageBox.open();
return;
}
text.setText(sb.toString());
}
}
Thanks in advance,
C
- 8
- Simple recursion / stack question
Hi All,
I suspect this is a bit of a 'how long is a piece of string' type question
(the answer to which is of course precisely 2 x half its length) but I'm
going to ask it anyway.....
How deep is the java process stack? If I write some complicated piece of
code that is recursive, how can I know if I will run out of stack doing the
recursion or not?
Michael
- 8
- Confused with the ArrayListHello,
ArrayList main = new ArrayList();
ArrayList copy = new ArrayList();
copy.add("Test1");
copy.add("Test2");
main.add(copy);
copy = new ArrayList();
copy.add("Test3");
copy.add("Test4");
main.add(copy);
for(int i=0;i<main.size();i++)
{
ArrayList temp = (ArrayList)main.get(i);
for(int j=0;j<temp.size();j++)
{
System.out.println(temp.get(j));
}
}
for(int i=1;i<main.size();i++)
{
ArrayList temp = (ArrayList)main.get(i);
temp.set(0,"Test5");
temp.set(1,"Test6");
}
for(int i=0;i<main.size();i++)
{
ArrayList temp = (ArrayList)main.get(i);
for(int j=0;j<temp.size();j++)
{
System.out.println(temp.get(j));
}
}
}
- 8
- Saving a BufferedImage as a JPEGI am saving a BufferedImage as a JPEG file under Windows XP.
I am using the JAI JPEGImageEncoder class.
The JPEG is saved as CMYK but I need RGB.
I cannot figure out how to get RGB. Any help?
- 9
- Why does a method act differently when invoked manually to when invoked through the driver class?Can anyone tell me why, when I run the driver class InstantiateFerry to read
a file containing the test just below, this part of the code:
ferry.getvehicleLocation(); produces the message Vehicle MVK806R is in lane
1 and position 1, which I don't want, but when I enter the file details
manually and invoke the method public void getvehicleLocation(), I get the
message I want with correct values for lane and position rather than just 1
and 1 every time?
BLUEJ_BELLE 3 120.0 285
# Test1.txt: Demonstration file for Project 2, November 2004
KR02123 1.04 5.1
DR02123 1.56 7.64
XR02123 1.049 5.1
L02123 3.15 17.1
YR02123 1.04 5.1
FR02123 1.56 7.65
BB51765 1.125 6.75
DB51765 1.6875 10.125
MVK806R 1.6875 10.125
FR02123 2.33 11.43
BR02123 1.049 5.1
MR02123 1.5735 7.66
SR02123 1.5735 7.63
CR02123 1.5735 7.64
public void addVehicle(Vehicle v)
{
int count = 0;
//System.out.println("deckLength "+deckLength+ " takenSpace
"+takenSpace+" getspaceTaken "+v.getspaceTaken());
if(deckLength < (takenSpace + v.getspaceTaken()))
{
laneCount += 1;
spaceLeft = takenSpace;
takenSpace = 0;
counter = 0;
}
//System.out.println("lanes " +lanes+ " laneCount " +laneCount);
if(laneCount == lanes)
{
System.out.println("Vehicle " + v.getReg() + " cannot board the
ferry as it is full.");
return;
}
while (deckArray[laneCount][count]!= null)
{
count += 1;
}
deckArray[laneCount][count] = v;
vehicleCount += 1;
for(int i = counter ; i < deckLength-1; i++)
{
if(deckArray[laneCount][i]!=null)
{
Vehicle vehicle = deckArray[laneCount][i];
takenSpace += vehicle.getspaceTaken();
}
}
counter += 1;
}
public void getvehicleLocation()
{
for(int lanePos = 0; lanePos < deckLength-1; lanePos++)
for(int laneLocation = 0; laneLocation < lanes; laneLocation++)
{
if(deckArray[laneLocation][lanePos]!=null)
{
Vehicle vehicle2 = deckArray[laneLocation][lanePos];
if (vehicle2.getReg() == "MVK806R")
{
vLane = laneLocation;
vPos = lanePos;
}
}
}
System.out.println("Vehicle MVK806R is in lane " + (vLane + 1) + "
and position " + (vPos + 1));
}
public int getlanePos()
{
return (vPos + 1);
}
public int getlaneLocation()
{
return (vLane + 1);
}
}
public class InstantiateFerry
{
private InstantiateFerry()
{
// Instances of this class are never created.
}
public static void main(String[] args)
{
// Here is an example statement showing you how to get at the name of
the
try
{
FileReader inFile = new FileReader(args[0]); // Open
the file
BufferedReader buffReader = new BufferedReader(inFile); // Turn
into BufferedReader
boolean endOfFile = false;
double totalCost = 0;
String line;
line = buffReader.readLine();
StringTokenizer st = new StringTokenizer(line);
st = new StringTokenizer(line, "\t");
String token = st.nextToken();
String token2 = st.nextToken();
int fLanes = Integer.parseInt(token2);
String token3 = st.nextToken();
double fLength = Double.parseDouble(token3);
String token4 = st.nextToken();
int fMiles = Integer.parseInt(token4);
Ferry ferry = new Ferry(token, fLanes, fLength, fMiles);
String line2;
line2 = buffReader.readLine();
System.out.println(line2);
double ferryLength = ferry.getLength();
//System.out.println(ferryLength);
do
{
String line3;
line3 = buffReader.readLine();
StringTokenizer st2 = new StringTokenizer(line3);
if (line3.equals(""))
{
endOfFile = true;
break;
}
else
{
while(st2.hasMoreTokens())
{ if (line3.equals(""))
{
endOfFile = true;
break;
}
else
{
String token5 = st2.nextToken();
String token6 = st2.nextToken();
double vWeight = Double.parseDouble(token6);
String token7 = st2.nextToken();
double vLength = Double.parseDouble(token7);
Vehicle vehicle = new Vehicle(token5, vWeight, vLength);
ferry.addVehicle(vehicle);
Money money = ferry.cost(vehicle);
totalCost += money.getCost();
//System.out.println(ferry.getSpace());
}
}
}
}
while (!endOfFile);
buffReader.close();
System.out.println(ferry.getferryName());
System.out.println("There are " + ferry.getVehicles() + " on the
ferry.");
System.out.println("There is " + ferry.getspaceLeft() + " metres
of space left on the ferry.");
System.out.println(totalCost);
ferry.getvehicleLocation();
// This method is supposed to find the location of Vehicle
"MVK806R".
}
catch (IOException e)
{
System.out.println("Caught unexpected exception " +
e.toString());
return;
}
} // End readFileBufferedReader()
} // End main()
- 9
- Correct use of ReadableByteChannelFor a piece of code intented to be rather
generic, I thought it would be a good idea
that it reads its input from a
ReadableByteChannel. The main reason to
choose it over an InputStream was that the
channel can be obtained for an InputStream as
well as for a RandomAccessFile.
Now the question:
How do you correctly perform a blocking read
from a ReadableByteChannel given that it does
not necessarily block?
I came up with
ReadableByteChannel source;
ByteBuffer inBuf;
...
int result;
while( 0==(result=source.read(inBuf)) ) Thread.yield();
In case the channel is blocking, the yield()
will never be called. If the channel is
non-blocking, the yield() may be called. But
on a machine without much load, I am afraid
it will generate load because no other thread
is interested in the processor.
Any ideas how this can be done better?
Harald.
- 12
- ObjectWebCon'06 - Call For Proposals CALL FOR PROPOSALS OBJECTWEBCON06 ObjectWeb Annual Conference 5th EDITION Paris France Januar 31st Februar 2nd 2006 http: ObjectWebCon06 object eb org SUBMISSION DEADLINE: No ember 21th 2005 ObjectWebCon06 the ne t ObjectWeb annual conference ill take place in Paris la D fense France from Januar 31st to Februar 2nd 2006 As ObjectWeb is mo ing in Anal st reports from a pure technical pla er in open source infrastructure soft are to a consortium of market pla ers its annual conferences strengthens as unique opportunit for professionals to disco er learn and e change on middle are and open source soft are technolog and Ecos stems As an e perienced professional of the domain ou are in ited to submit proposals in one or more of the follo ing sessions: Parallel sessions Best use case a ards Podium talks Please freel distribute this call to interested colleagues and friends We thank ou for making our submission online before No ember 21th and are looking for ard to reading our proposals Best regards Object ebCon06 Program Committee mailto:OWCon06 contact@object eb org Note: More information can be found on the eb at http: ObjectWebCon06 object eb org or belo in plain te t form ============================================================================ The ObjectWebCon06 program committee is seeking to recei ing proposals for the follo ing sessions: 1 Parallel sessions 45 minutes ================================== Sessions ill co er the three follo ing topics: T1 Using Open Source Middle are for : 3 presentations in each topic enterprise Ja a APS J2EE Webportal B2B BI SOA application integration ESB Clustering GRID autonomic management pro isioning large scale s stems Ad hoc net orked s stems telco mobilit RFID embedded T2 In the business of Open Source Middle are 6 presentations Business models legal aspects OSS Strateg public policies real orld cases go ernmental uses T3 Focus on ObjectWeb projects 10 presentations O er ie introduction primers guided tours getting started ith ObjectWeb projects Guideline to submit in Parallel sessions The title of the presentation A brief outline or abstract of the presentation not to e ceed 400 ords For each speaker the speaker name title compan professional street and email addresses phone and fa numbers Addresses phone and fa numbers are for organi ation purposes onl and ill not be distributed to third parties ithout prior agreement A short biograph of the proposed speaker s sho ing rele ant e perience and qualification to speak on the proposed subject matter not to e ceed 300 ords Submissions should be made online at http: ObjectWebCon06 object eb org iki bin ie Main CFP and should be ritten in English presentations are to be gi en in English Important dates for Parallel sessions: Abstract due: No ember 21th 2005 Notification: starting December 5th 2005 2 Best Use Cases A ards ======================== The ObjectWebCon06 Best Use Cases contest is a challenge for hich ou ma file one or se eral submissions about real orld use cases of ObjectWeb components and platforms Winners ill be nominated b ObjectWeb members through on line ote December 1st 15th A ards ill be offered in the follo ing categories: A1: Entreprise Ja a: production use of ObjectWeb enterprise Ja a components and platforms A2: ISV Integration: commercial offering or de elopment embedding some ObjectWeb components A3: Jur s Special Pri e: an use of ObjectWeb components and platforms Guideline to run for Use Cases A ards: A brief outline or abstract not to e ceed 150 ords ObjectWeb components that ha e been used a comment about this success h has it been a success according to ou? In option ou ma add: a complete description of the Use Case screenshots Submission should be made online at http: ObjectWebCon06 object eb org iki bin ie Main A ardsForm Important dates for Use Case A ards: Abstract due: No ember 21st 2005 Online ote: December 1 12 Notification: Starting December 15th 3 Podium talks =============== Podium talks intends to gi e all participants an opportunit to present ork the do relating to open source middle are Podium speaker ill ha e the floor for 10 minutes and ma use up to 5 slides Podium talks ill complement technical sessions on the follo ing topics: enterprise grid J2EE APS SOA ESB Telco Guideline for podium speakers: Podium talks are scheduled on a first come first ser ed basis Send an email to OWCon06 contact@object eb org in order to reser e a slot On behalf of the ObjectWebCon 06 Organi ation Committee Xa ier MOGHRABI ObjectWeb Consortium http: object eb org
- 12
- JDK 1.5 and J2EE?I have bravely set up JDK 1.5 on one of my systems, which works a
treat. The trouble I'm having is with using it for J2EE applications.
I've tried dropping j2ee.jar into lib/ext so I can get at Servlet
and so on, but then I get another problem...
I use TransformerFactory.newInstance(), and I get a "class not found"
exception for org.apache.whatever.Transformer (which JDK 1.4 used)
rather than com.sun.org.apache.whatever (as per JDK 1.5). I presume
that the TransformerFactory is coming from j2ee.jar rather than the
1.5 library for this to happen...?
So: I want to be able to rebuild (and improve!) a load of code using
1.5, and I can do this for most things; servlets recompile fine, as
do various other apps, but I seem to have a choice between leaving
all my servlets on 1.4 (and removing j2ee.jar from 1.5) or leaving
my XML stuff on 1.4 (which I don't want to do, because I want some
of the 1.5 enhancements).
Any suggestions? Am I being stupid again?
-----------------------------------------------------------------
John English | mailto:email***@***.com
Senior Lecturer | http://www.it.bton.ac.uk/staff/je
School of Computing & MIS | ** NON-PROFIT CD FOR CS STUDENTS **
University of Brighton | -- see http://burks.bton.ac.uk
-----------------------------------------------------------------
- 13
- 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?
- 13
- Protected and package in iterfaceLew wrote in thread "Interface":
> What maxnesler forgot to show is that the implementing class declares
> the method to be 'public', which is implied automatically in the
> interface declaration
Why did the people writing the Java specs decide that an interface
should not contain protected and package methods?
I can imagine several cases where this would be useful.
Phil
|
| Author |
Message |
yawnmoth
|
 Posted: 2006-8-23 12:02:00 |
Top |
java-programmer, 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?
|
| |
|
| |
|
Oliver Wong
|
| Posted: 2006-8-29 2:30:00 |
Top |
java-programmer >> auto-resizing applets?
"yawnmoth" <email***@***.com> wrote in message
news:email***@***.com...
> 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?
No easy way, AFAIK. You could try JavaScript on the HTML side.
>
> Also, would it be possible to change the font of the Label?
http://java.sun.com/j2se/1.5.0/docs/api/java/awt/Component.html#setFont(java.awt.Font)
> Or maybe
> make it so that you can highlight the Label's text just as you can
> normal html?
http://java.sun.com/j2se/1.5.0/docs/api/java/awt/Component.html#setFocusable(boolean)
- Oliver
|
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Index ‹ java-programmer |
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- 1
- 2
- 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
- 3
- 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
- 4
- 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,
stephen mchugh
groupware communications inc.
e: "smchugh" at the above web address
---
- 5
- 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
- 6
- Message from eBay Member Regarding Item #270012346034
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- 7
- 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
- 8
- 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
- 9
- 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
- 10
- 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
- 11
- 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?
- 12
- Add Linked List to a JListHi,
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
- 13
- 14
- 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
- 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
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