| how to fire JTree child node event |
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Index ‹ java-programmer
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- 1
- 1
- list box values to be allignedhi,
my list box in the html page contains list box with values. these
values inturn have subvalues and I have to allign the child values to
right so that i can know the parent of the values. how can I do that.
list values should look something like this...
(suppose u have a list box with the state names in usa. the cities of
the states would be the child elements and the state names would be the
parent values)
ALABAMA
Abbeville
Huntsville
Birmingham
Montgomery
......
ALASKA
Anchorage
Tucson
.....
.......
........
........
Urgent can someone help pls. I can use java script or any java
technology
thanks..
- 1
- Multiple thread handle problemhi
I am starting a no.of threads(500) from my application. i want to
start a new thread as soon as one of these threads dies.Any of the
thread could die at any particular time.Currently i am using a loop
to check which of the threads is alive and i can use join() for
others.I don't want to use a loop as that is eating a lot of memory.
Using synchronization method is it possible to block (creation of new
thread) untill one of the current thread dies.
Please help...
Anks
- 1
- Java 5.0 released
http://news.com.com/New+Java+looks+to+shake+up+desktop/2100-1007_3-5389888.html
- 2
- LISTEN UP EVERYBODY. put your programming skills to use in this new MMORPG game. details listedRun Online is a new MMORPG( massive multiplayer online role playing
game) in progress. I wish for it to be devoloped completley in java,
making it platform independent( able to run on any platform). The game
is set in medivial time(not finalized yet). When i firsted dreamed up
this project i had a huge case of amatures syndrome, as in the game was
so magnificently filled with a 1000nd classes, over a million monsters,
billions of monsters, and large world(I even had planned on putting in
25 other outer space planets)!!!!!! and all of these looked realistic.
Yep, thats the amatures syndrome. I got over it slowly as i realized
the difficulty in creating even the smallest of worlds. I couldnt
possibly even do that on my own, so i desided to put togheter this
dream team of specilists.
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and organize the events and keep the project rolling.
.
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to program different segments of the game( each can focus on a
different aspect of the game to program)
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3 graphic designers/ animation experts with basic knowledge of java:
their job is to create teh textures, buildings, and animations of the
world and the character as well as all the items and monsters.
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make 100ds of reliable databases for usename, passwords. Items of a
character. Skills and many more. Its a key part of the game to get this
right.
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encryption to code the graphics send over by the graphic people as
well as text written in the forum. This will prevent those outside of
"The Team" from getting into the game files and misusing it. The
network administrator part requires for knowledge in that field. This
person will the one responsible for having the game work smoothly on
the web, and sequerly.
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3 Researchers/ advertisers: The reserchers must reserch and find
suitable programs, and information relating to the game of aspects of
the game. The advertisers will be responsible for advertising the game
to the public once it's finished. They will have to create cool
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suggestions. They will be among the first in line to get a moderator
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If you would like to know more about any of these, or wish to join The
Project Team, plz email me at email***@***.com with your
qualifications and comments. You definetly have a good chance of
getting into the project if you sign up early. I will personaly read
all the applications and put my sincear thoughts into it.
Youc can also view the forum at http://runonline.aceboard.com
( it has no topics at the moment)
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- 9
- fixing image sizeI realise there have been several posting on this subject already.
However, despite these, I still can't quite work out how to do this.
I need to take the image from a file (.gif .jpg etc), ensure that the
entire image fits on a JPanel of some size, then put this JPanel onto
another Jpanel.
From what I could gather, it looked like I had to extend JPanel and
override paint(). The problem comes when I try to use drawImage().
Here's the code.
//relevent imports
public class Picture extends JPanel
{
private String fileName;
/** Creates a new instance of Picture */
public Picture(String file)
{
fileName=file;
}
public void paint(Graphics g)
{
super.paintComponent(g);
}
}
- 10
- Special characters: how to read them into JTable?Hello everybody,
I would like to read String data from a file into a JTable (using Vectors).
These data contain special characters,
mainly Greek symbols. Ideally, I would also like to display subscripts as
well, if possible.
Does anybody knows how this can be done?
Thanks in advance,
Maria
- 10
- stdout and stderr don't occur sequentially in Eclipse and NetbeansZelluX wrote:
> But System.err is unbuffered, so I don't think it will have any effect
> to flush after every write.
There is nothing in the Javadocs to indicate that System.err is unbuffered.
Like System.out, System.err is a java.io.PrintStream. The docs for
PrintStream imply that instances are buffered, else the flush() method would
be meaningless. So it is not accurate, or at least not safe to say that
System.err is unbuffered.
That leaves auto-flushing. Nothing in the Javadocs for System.err indicates
that it's created with autoFlush on. Did you check the source for your
particular flavor of Java to see if it is?
In my installation, the source shows:
setErr0(new PrintStream(new BufferedOutputStream(fdErr, 128), true));
Whaddaya know? System.err is buffered in my installation.
Sun Java JDK 1.6.0_10b25, 64 bit, Linux.
Are you quite certain that System.err is unbuffered in your Java installation?
--
Lew
- 10
- J2EE architecture questionHello.
Iv read a spec from a firm which wants to build a J2EE application,
but the application is not supposed to be web based. The reason for
this is mostly a very complex UI.
From what ive read about the J2EE architecture ,the presentation layer
has always been servlets or jsp.
Is it a posibility / option to build a J2EE application without the
web based presentation layer?
- 10
- Great time in FranceHello
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I found a holiday cottage from these guys www.looktogo.co.uk
Regards,
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- 10
- date formathello
i am begining to working againt one postgresql database with java.
i must to put into the database some dates.
i must to configure the date fields into the database. which will be the
date format? timestamp?
if in java i have the String d="03/03/2003" how can i to format, convert,
this String to date timestamp?
which will be the idoneous field format for storing the dates and for
working with java?
Thanks
- 10
- File creation in the web applications' rootHello all.
Is it possible to get the path at which my application root is placed
by means of either the ServletContext or the ServletConfig object?
What I am trying to do here is to dynamically create a Javascript file
on the fly and put in the script directory of my web application. But
since the working directory in a web applications case is the
directory which contains the app servers' executable, any new file
created would be created there and I don't want to hard code the path
to my script folder. I want everything to be relative to the
applications' root as far as possible.
Can it be done without any special configuration, the way I can get a
resource present in the application root by the getResource() method?
Any kind of help would be greatly appreciated.
Regards,
sasuke.
- 13
- Eclipse path problem while opening file.When ever I try to read/open '.properties' (for that matter any file)
inside my project(for example I try to open system.properties file in
HelloWorld class) it cannot open/find it.
For example if I have a project called project1 which has java source
files in
src folder then and in any of the class files I cant open any of the
files inside the
src folder. No matter where I place the file that has to be read
(inside project1 or src
or build folder) it simply gives me java.io.FileNotFoundException
Instead if I give the complete path it works. How can I read the files
relative to
my project folder without giving the complete path?
It seems that when I run my application in looks in ECLIPSE_HOME/bin
folder, for the
file being read, which of course I don't want to happen.
I am using Eclipse 3.2 (WTP), Windows XP SP2 JDK 1.5.03
Any pointers how to fix this?
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| Author |
Message |
William Z.
|
 Posted: 2006-12-27 5:25:00 |
Top |
java-programmer, how to fire JTree child node event
I have a JTree where each node displays a specific view when selected.
I'd like to somehow fire an event to default the app which view to
display when opened.
How do I fire an event for a JTree as if the user clicked on a specific
child node?
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Brandon McCombs
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| Posted: 2006-12-27 11:58:00 |
Top |
java-programmer >> how to fire JTree child node event
William Z. wrote:
> I have a JTree where each node displays a specific view when selected.
> I'd like to somehow fire an event to default the app which view to
> display when opened.
>
> How do I fire an event for a JTree as if the user clicked on a specific
> child node?
>
You don't have to fire an event because the JTree will do that for you.
All you have to do is setup a TreeExpansionListener and
TreeSelectionListener.
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William Z.
|
| Posted: 2006-12-27 16:02:00 |
Top |
java-programmer >> how to fire JTree child node event
>
> You don't have to fire an event because the JTree will do that for you.
> All you have to do is setup a TreeExpansionListener and
> TreeSelectionListener.
How so? You mean if I select a node by clicking on it w/ the mouse? I
don't want to have to select a node with the mouse. As soon as my app
initializes, I wan't to programmatically fire an event to do this
automatically.
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Ingo Buescher
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| Posted: 2006-12-30 19:17:00 |
Top |
java-programmer >> how to fire JTree child node event
William Z. wrote:
> I have a JTree where each node displays a specific view when selected.
> I'd like to somehow fire an event to default the app which view to
> display when opened.
>
> How do I fire an event for a JTree as if the user clicked on a specific
> child node?
>
If I understand you correctly the following methods in JTree might help:
void setSelectionPath(TreePath path)
void setSelectionRow(int row)
IB
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Index ‹ java-programmer |
- Next
- 1
- Where Does the Code Go?I have a good programming practice question. Just for fun, Ive taken on a
side project that will help a teacher friend of mine work out grades. I
want a GUI interface that will store and retrieve grading info. So Im
hoping someonecan walk me through my class structure. My biggest question
regards whether or not it is good programming practice to have data objects
as members of my GUI class or if it should be done another way? I have my
main class which calls the GUI class. For now in my most basic skeleton, I
have a very simple student class, contains has a grade class. How should
these classes be arranged?
My first thought was have student a member of the GUI class. Say I have a
form with nothing more then two text fields for name and grade, and a
button. When I click the button, I want to store the the textfield data in
the student/grade classes. I can do that fine if student is a member of the
GUI class, but for some reason Im uncomfortable with this design. It seems
the GUI should be design only, no data access code in there. Eventually I
want to add database connection objects to this model for permanent student
data storage and would need to know where those would be called from as
well. So what do you guys think?
Classes:
Main
Gui
Student -> Grade
How to arrange?
Thanks
Rv5
- 2
- remote databaseHello!
I'm quite new to Java. I'm making an MySQL interface. So my problem is:
Can I connect to a remote mysql database without having any additional
software running on that server ?
Is JDBC part of JVM ?
I know these are silly questions, but you would help me a great deal.
Thank you!
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- 3
- Calling own-constructors inside another constructorHi all,
Inspecting some pieces of code from someone I found things like this:
class A {
private String id = "";
public A() {
super();
}
public A(String id) {
this.id = id;
}
}
class B extends A {
public B() {
this(""); <-------------------- HERE!
}
public B(String id) {
super(id);
}
}
Inside constructor B() it's calling a constructor. Could this cause some collateral or strange problems?
I know it's nonsense because id attribute it's being initialized by default to "", but I'd like to know if
also is a problem.
- 4
- You don't know anything ...Hello John Bailo , You wrote ,
" I know when someone is bilking his customers
for c++ code whose functionality should be written in
OpenCalc macros "
You comment re-proves :
1 _ You don't know anything about
programming for the desktop .
2_ You don't know anything about my customers ,
even thought I've explained them to you
a million times .
- 5
- How to approachLuc The Perverse wrote:
...
>
> WAIT!
>
> I think I got it (I'm not meaning to imply that you didn't help) - and I
> didn't look at anything.
>
> Let's say there are NxN squares, and there are x number of moves.
>
> I can make the square x, y be represented as an integer 0..N * N - 1
>
> So I create a 2D array [N*N][x] of longs which will represent the sum of the
> number of unique paths to the given point.
...
You got it. There is an optimization that reduces the memory cost,
but you have a dynamic programming solution to the problem. And you have
the really big savings from exponential to linear increase in time and
memory as the number of moves increases.
> Hey thanks everyone. This is more than just a single problem or some points
> on a practice problem that doesn't matter anyway. I'm learning how to do
> this, and becoming a better programmer - and that is important to me.
> Learning new abstract concepts, and having exciting revelations is actually
> (though sadly) a bit of a rarity for me.
I think, more than ever after seeing this, that you would benefit from
reading a book on algorithm design.
Patricia
- 6
- String and Char HelpI have a few questions but first here is my code.
public class CountVowels
{
public static void main(String[] args)
{
int vowel = 0;
int i;
char pos;
String String1 = "Event Handlers is dedicated to making your
event a most memorable one.";
int length = String1.length();
for(i = 0; i < length - 1 ; i++);
{
pos = String1.charAt(i);
if (pos == 'A' || pos == 'a' || pos == 'E' || pos == 'e' ||
pos == 'I' || pos == 'i' || pos == 'O' || pos == 'o' || pos == 'U' ||
pos == 'u') {
vowel += 1;
}
}
System.out.println("There are " + vowel + " vowels in this
String");
}
}
Question one is why does String1.length() return 70 when there are
only 69 chars. Second question is why does this code not count the
vowels in the String.
Thanks in advance
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- 7
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To unsubscribe, send any mail to "email***@***.com"
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- Class.forname()Hello ,
I have a necessity to delete a jar file which is in the CLASSPATH.
But JVM locks it after a class.forName() call, even though the class
loaded is NOT in the JAR file I want to delete. ( I cannot remove the
JAR file from the CLASSPATH )
First of all is it possible?
Any help is appreciated
thanks in advance
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contains java will not load the java. I have recieved
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nothing that will help.
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to get java working?
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- 11
- help adding items to JComboBox on the flyAnyone happen to see what I might be doing wrong. I'm trying to add
items to my
JComboBox on the fly as nodes are added to the tree. It's like this ...
1. User adds tree nodes to a tree.
2. Then user can select on another node elsewhere in the tree which
renders a JComboBox
and the items just added from step 1 are listed in this box.
I have a few problems ...
- after I select my item in the combobox, the combobox stays there. If
I then select on another node, the item in the combobox doesn't get
selected. It doesn't work where I just select an item and it closes up
and that item is selected.
- sometimes I get a null pointer exception in action performed (because
getSelectedIndex() in getCellEditorValue() returns a -1) which seems to
get called while the program execution is still in the
getTreeCellEditorComponent. This confuses me. Why's it returning -1
when there are items in my combobox?
Any help much appreciated.
(I hope I've got my code snippet here w/o any typos, I had to cut it
down)
----
public class TreeEditor extends AbstractCellEditor implements
TreeCellEditor
{
private JComboBox myComboBox;
public TreeEditor() {
myComboBox = new JComboBox();
myComboBox.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
TreePath path = jTree.getSelectionPath();
stopCellEditing();
Integer val = (Integer) getCellEditorValue();
myComboBox.setSelectedItem(val.intValue());
((MyUserObjectInfo)nodeInfo).setName(
myComboBox.getSelectedItem().toString());
node.setUserObject(((MyUserObjectInfo) nodeInfo));
jTree.getModel().valueForPathChanged(path, nodeInfo);
}
});
}
public Object getCellEditorValue() {
return new Integer(myComboBox.getSelectedIndex());
}
public Component getTreeCellEditorComponent(JTree tree,
Object value, boolean isSelected, boolean expanded,
boolean leaf, int row) {
// find the children of this node that were recently added ...
TreeModel tModel = jTree.getModel();
Object root = tModel.getRoot();
DefaultMutableTreeNode carRoot = (DefaultMutableTreeNode)
tModel.getChild(root, 0);
String nodeName = null;
if (myComboBox.getItemCount() > 0) {
myComboBox.removeAllItems();
}
// add children of another node into this combobox.
for (Enumeration e = carRoot.children(); e.hasMoreElements();)
{
DefaultMutableTreeNode carNode =
(DefaultMutableTreeNode)e.nextElement();
Object nodeInfo = carNode.getUserObject();
nodeName = ((MyUserObjectInfo)nodeInfo).getName();
myComboBox.addItem(nodeName);
}
if (myComboBox.getItemCount() > 0) {
myComboBox.setSelectedIndex(0);
}
return myComboBox;
}
}
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- Shootout (startup)
>On Wed, 30 Apr 2008 08:00:38 -0700 (PDT), Isaac Gouy
<email***@***.com> wrote:
>Why don't you go through all...
startup benchmark...
http://shootout.alioth.debian.org/gp4/benchmark.php?test=hello&lang=all
Damn! C & C++ are killing java in this benchmark. Though I discovered
a trick that improves the speed somewhat and saves some face...
With n = 200 (i.e 200 startups in continuous order).
java hello
time: 23.433s
However, just adding the flag -XX:+AggressiveHeap
java -XX:+AggressiveHeap hello
time: 9.914s
that's a huge improvement.
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I am using a filechooser object to select files.
JFileChooser _fileChooser = new JFileChooser();
File[] selectedfiles = _fileChooser.getSelectedFiles();
for (int i =0 ; i < selectedfiles.length; i++) {
//path = selectedfiles[i].getCanonicalPath();
path = selectedfiles[i].getPath();
}
The _fileChooser.getSelectedFiles() returns already absolute path
names. So no matter if I call getPath or getCanocialPath I get the
abosolute path names.
But I want to display symbolic links as relative pathnames.
Is there a way to accomplish this?
Any help I will welcome.
Thanks in advance,
Zoran
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- Problem with focus on JListHi!
I got 2 JLists . I doubleclick an item to display it's details.
This works fine so far, but:
When I select an item in JList1 and in JList2 the Mouselistener doesn't
know from which JList he should get the item.
So I had the idea that when you select an item in JList1 JList2 should
loose all selections.
But I just don't get it done.
any ideas?
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