 |
|
Index ‹ java-programmer
|
- Previous
- 1
- 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
- 6
- 7
- 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
- 11
- 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
-----------------------------------------------------------------
- 11
- 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
- 11
- 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>
- 11
- 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
- 11
- 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
- 11
- 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()
- 11
- 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?
- 11
- 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
- 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
- 12
- 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?
- 16
- Message from eBay Member Regarding Item #270012346034
eBay eBay sent this message!
This message originated from eBay. [1]Learn more.
[ltCurve.gif]
Question about ltem -- Respond Now
[rtCurve.gif]
[s.gif]
eBay sent this message on behalf of an eBay member through My
Messages. Responses sent using email will go to the eBay member
directly and will include your email address. [s.gif]
[s.gif]
[s.gif]
[s.gif]
Question from olympusauctions
[s.gif] [2]olympusauctions( [3]358)
[s.gif] Positive feedback: 100%
[s.gif] Member since: Dec-11-02
[s.gif] Location: FL, United States
[s.gif] Registered on: www.ebay.com
[s.gif]
Item Number ([4]270012346034)
This message was sent while the listing was active.
olympusauctions is a potential buyer.
[s.gif]
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
[s.gif]
[5]Respond Now
[s.gif]
Responses in My Messages will not include your email address.
Thank you,
eBay
[s.gif]
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
[s.gif]
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
about trading safely.
[s.gif]
[s.gif]
Is this email inappropriate? Does it violate [9]eBay policy? Help
protect the Community by reporting it.
[s.gif]
[s.gif]
[s.gif]
[s.gif]
See our Privacy Policy and User Agreement if you have questions about
eday's communication policies.
Privacy Policy:
[10]http://pages.ebay.com/help/policies/privacy-policy.html
User Agreement:
[11]http://pages.ebay.com/help/policies/user-agreement.html
Copyright ?2006 eBay, Inc. All Rights Reserved.
Designated trademarks and brands are the property of their respective
owners.
eBay and the eBay logo are registered trademarks or trademarks of
eBay, Inc.
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
|
| Author |
Message |
srinivas.veeranki
|
 Posted: 2006-7-17 18:34:00 |
Top |
java-programmer, Problem with JCombo box
Hi 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
|
| |
|
| |
|
Trung Chinh Nguyen
|
| Posted: 2006-7-17 19:08:00 |
Top |
java-programmer >> Problem with JCombo box
Nothing's wrong here. When I select the first combo the second combo
points to the first element (Which is an empty string). Isn't that what
you expected?
email***@***.com wrote:
> Hi 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....
>
|
| |
|
| |
|
srinivas.veeranki
|
| Posted: 2006-7-17 19:13:00 |
Top |
java-programmer >> Problem with JCombo box
Hi Chinh Nguyen !
Here 2 nd combo box points to first element but the scroll bar of
the combo box is not moving to first element. I need to move the scroll
bar of combo box should be at the top not in the moddle. It is
happening at very first time only...Thaks for ur reply ... Plz check
once again.....
Srinivas
Trung Chinh Nguyen wrote:
> Nothing's wrong here. When I select the first combo the second combo
> points to the first element (Which is an empty string). Isn't that what
> you expected?
>
> email***@***.com wrote:
> > Hi 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....
> >
|
| |
|
| |
|
Trung Chinh Nguyen
|
| Posted: 2006-7-17 21:17:00 |
Top |
java-programmer >> Problem with JCombo box
I see the problem now. Don't know what to do with it. Maybe it's some
bug in the ComboBoxModel
email***@***.com wrote:
> Hi Chinh Nguyen !
> Here 2 nd combo box points to first element but the scroll bar of
> the combo box is not moving to first element. I need to move the scroll
> bar of combo box should be at the top not in the moddle. It is
> happening at very first time only...Thaks for ur reply ... Plz check
> once again.....
>
> Srinivas
>
|
| |
|
| |
|
srinivas.veeranki
|
| Posted: 2006-7-18 12:30:00 |
Top |
java-programmer >> Problem with JCombo box
Hi !
This required to implement this in my project. Client insists us
to achieve this kind of functionality. I tried various ways but in
vain, Can we solve this kind of bug? If u know Please help me.
Thanks
Srinivas
Trung Chinh Nguyen wrote:
> I see the problem now. Don't know what to do with it. Maybe it's some
> bug in the ComboBoxModel
>
> email***@***.com wrote:
> > Hi Chinh Nguyen !
> > Here 2 nd combo box points to first element but the scroll bar of
> > the combo box is not moving to first element. I need to move the scroll
> > bar of combo box should be at the top not in the moddle. It is
> > happening at very first time only...Thaks for ur reply ... Plz check
> > once again.....
> >
> > Srinivas
> >
|
| |
|
| |
|
srinivas.veeranki
|
| Posted: 2006-7-19 14:52:00 |
Top |
java-programmer >> Problem with JCombo box
Hi 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
|
| |
|
| |
|
Bart Cremers
|
| Posted: 2006-7-19 16:23:00 |
Top |
java-programmer >> Problem with JCombo box
email***@***.com schreef:
> Hi 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....
>
< code snipped >
>
>
> Thanks & Regards
>
> Srinivas
As far a I can see, I'm not getting the problem you're having. The
second combo always selects and scrolls to the first element when the
first combo changes.
Regards,
Bart
|
| |
|
| |
|
srinivas.veeranki
|
| Posted: 2006-7-19 16:33:00 |
Top |
java-programmer >> Problem with JCombo box
Hi !
This problem will be happening only at first time only... If u observe
it ,,,, U can see the problem while ur selecting the first combo...
then observe in the 2nd combo... U will get tht problem...
Bart Cremers wrote:
> email***@***.com schreef:
>
> > Hi 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....
> >
> < code snipped >
> >
> >
> > Thanks & Regards
> >
> > Srinivas
>
> As far a I can see, I'm not getting the problem you're having. The
> second combo always selects and scrolls to the first element when the
> first combo changes.
>
> Regards,
>
> Bart
|
| |
|
| |
|
Larry Barowski
|
| Posted: 2006-7-20 0:38:00 |
Top |
java-programmer >> Problem with JCombo box
<email***@***.com> wrote in message
news:email***@***.com...
> Hi !
>
> This problem will be happening only at first time only... If u observe
> it ,,,, U can see the problem while ur selecting the first combo...
> then observe in the 2nd combo... U will get tht problem...
I confirm the problem with both Windows and Metal L&Fs,
under Java 1.6 beta. I couldn't find this in bug parade, so
you should report it.
I couldn't find any work-around, except to do
cb2.showPopup();
cb2.hidePopup();
but you have to do it when the combo box is showing,
so the flicker of the popup will be visible, which is
probably more annoying than the original problem.
|
| |
|
| |
|
| |
|
Index ‹ java-programmer |
- Next
- 1
- 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?
- 2
- 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
- 3
- 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
- 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
- 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
- 6
- 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.
- 7
- 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
- 8
- 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
- 9
- 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
- 10
- 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
- 11
- 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);
- 12
- 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
- 13
- 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
- 14
- 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
- 15
- 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
|
|
|
