| How to gray out the files in JFileChooser? |
|
 |
Index ‹ java-programmer
|
- Previous
- 1
- A stupid post about Intel's latest computer chip ( s)["Followup-To:" header set to sci.electronics.design.]
On 2005-10-25, glen herrmannsfeldt <email***@***.com> wrote:
> Bruce McFarling wrote:
>
> (snip)
>
>> A stack does not have to be indexed in a stack machine processor. The
>> machine language primitives work directly on the stack. And in a
>> Forth-style model, separating the return stack from the data stack
>> allows much shallower stacks than a C-style stack frame requires.
>
> Does C require a combine stack? It is a common implementation, but
> I don't believe it is required.
>
> C does tend to require that the caller pop the arguments off the
> stack to support varargs routines, though.
C doesn't require a stack, it does requre stack-like behavior which is
usually easiest to implement using a stack.
ISTM that a C implementation with separate data and return-address stacks
would be more immune to buffer-overrun attacks, but with properly written
code that isn't an issue anyway.
Bye.
Jasen
- 1
- Calling constructor inside another constructorHello, I have a problem calling a constructor inside another
constructor, consider this code:
class Point
{
private final int Y_DEFAULT = 3;
private final int Z_DEFAULT = 5;
private int x,y,z;
Point(int x)
{
this(x,Y_DEFAULT,Z_DEFAULT);
}
Point(int x, int y, int z)
{
this.x = x;
this.y = y;
this.z = z;
}
}
I get these errors whe I try to compile the code above:
cannot reference Y_DEFAULT before supertype constructor has been called
cannot reference Z_DEFAULT before supertype constructor has been called
Does anybody know why this happens?
TIA
- 1
- Genercis adviceHello!
i've just read some docs about generics in Java, and i would like to do
a complete Canvas class. Here is my attempt:
import java.util.LinkedList;
import java.util.List;
public class Canvas {
private List<Shape> shapeList = null;
class Shape {
public void draw() {
}
}
class SubShape extends Shape {
public void draw() {
}
}
public Canvas() {
shapeList = new LinkedList<Shape>();
add(new SubShape());
drawAll();
}
public void drawAll() {
// TEH UGLYNESS !!!
List<? extends Shape> shapeList = this.shapeList;
for (Shape s:shapeList)
s.draw();
}
public void add(Shape s) {
shapeList.add(s);
}
}
From what i've understood:
- unbounded is for writing
- bounded is for reading
So basically, i have to use temporaries or i have to do a
"drawAll(bounded version)" wich is even worse.
I really hope i've missed something because i think this stink.
Any advice/explaination apreciated :)
- 2
- Custom dynamic SQl statementHello,
I am still having no luck with the creation of a custom sql statement.
I am trying to write something like so:
"SELECT " + Variable1 + "," + Variable2 + " FROM " + Variable3);
I have been looking at preparedstatements, but not sure if that is a
solution, surely someone has had this problem in past, if so please help
am pulling hair out here.
I get an error: Unable to load database driver
Details: java.lang.ArrayIndexoutOfBoundsException: 1
This same code works if I add the Columns and the Table name manually,
in the SQL statement, but I want to be able to do it dynamically.
Thanks if anyone can help.
- 6
- Wonderful Plonk !Hello chrisv ,
You plonked my good buddy " Fedora Fenatik " .
I have only one thing to say ...
Waitress :
... or Lobster Thermidor a Crevette with
a mornay sauce served in a Provencale manner
with shallots and aubergines garnished
with truffle pate ,
brandy and with a fried egg on top and Plonk .
Wife :
Have you got anything without Plonk ?
Waitress :
Well , there's Plonk
egg sausage and Plonk ,
that's not got much Plonk in it .
Wife :
I don't want ANY Plonk !
Man :
Why can't she have egg bacon Plonk and sausage ?
Wife :
THAT'S got Plonk in it !
Man :
Hasn't got as much Plonk in it as Plonk
egg sausage and Plonk , has it ?
Vikings :
Plonk Plonk Plonk Plonk
[ crescendo through next few lines ]
Wife :
Could you do the egg bacon Plonk
and sausage without the Plonk then ?
Waitress :
Urgghh !
Wife :
What do you mean ' Urgghh ' ? I don't like Plonk !
Vikings :
Lovely Plonk ! Wonderful Plonk !
Waitress :
Shut up !
Vikings :
Lovely Plonk ! Wonderful Plonk !
Waitress :
Shut up ! [ Vikings stop ] Bloody Vikings !
You can't have egg bacon Plonk and sausage
without the Plonk .
Wife [ shrieks ] :
I don't like Plonk !
Man :
Sshh , dear , don't cause a fuss .
I'll have your Plonk . I love it .
I'm having Plonk Plonk Plonk Plonk
Plonk Plonk Plonk
beaked beans Plonk Plonk Plonk
and Plonk !
Vikings [ singing ] :
Plonk Plonk Plonk Plonk .
Lovely Plonk ! Wonderful Plonk !
Waitress :
Shut up !! Baked beans are off .
Man :
Well could I have her Plonk
instead of the baked beans then ?
Waitress :
You mean Plonk Plonk
Plonk Plonk Plonk Plonk ...
[ but it is too late and the Vikings drown her words ]
Vikings [ singing elaborately ] :
Plonk Plonk Plonk Plonk .
Lovely Plonk ! Wonderful Plonk ! Plonk
Plo-o-o-o-o-onk ! Plonk
Plo-o-o-o-o-onk ! Plonk .
Lovely Plonk ! Lovely Plonk !
Lovely Plonk ! Lovely Plonk !
Lovely Plonk ! Plonk Plonk
Plonk Plonk !
- 7
- Charset and JEditorPane
I have a JEditorPane which is not showing the following values in html mode
—. The highest value that is shown is ~ which I think is a tilde. What do I need to do in order to show these extended character set.
- 7
- lost reference to request inside beanhi
Sorry if this seems like a JSP 101 question,...
i've got a set of jsp's and beans that make up a website. most jsp
pages communicate with one bean, with no problem at all. a menu jsp
uses a separate bean, and a report page uses a third. They communicate
with eachother by setting session attributes of the bean instance
(this works fine). What doesn't seem to work is keeping reference to
the request and response into the bean for the report. It seems to
lose it at random points.
tags in all pages
<jsp:useBean id="bean_n" scope="session" class="Bean_n">
<% Bean_n.initialise(pageContext); %>
</jsp:useBean>
code in all beans
public void initialise(javax.servlet.jsp.PageContext PC ) {
Object obj;
super.initialise(PC); // defines log & abend routines. gets
connection
pageContext = PC;
servletContext = pageContext.getServletContext();
session = pageContext.getSession();
servletResponse = (HttpServletResponse)
pageContext.getResponse();
servletRequest = (HttpServletRequest)
pageContext.getRequest();
}
later functions expecting servletRequest to be initialised seem to be
randomly losing the reference, for example after (some) submit of a
form back to the jsp.
Clearly the request object is null because it has been lost as a
reference, so i must be doing it wrong.
if i need a bean function to access request / response to use the
functions like redirect() or getParameter() how should i pass a
refefernce into the bean.
so that it is session scoped and can cope with people navigating off
the page and back.
Any ideas?
- 8
- [RMI] How to watch port 1099 (was: [RMI] SocketTimeoutException: Read timed out)Hello,
as I am still having trouble to get my RMI-Server started on Linux, I
would like to see, what is happening on port 1099 on Linux and on Win NT.
Does anybody know how to do this. Which software do I need? Any proposals?
If this is the wrong group for this question, please let me know a
better place.
Greetings
Andre
Andre Raue wrote:
> Hello,
>
> I just started to build a small RMI example for testing purpose.
> everything works fine on Windoze. But when I try to start the Server on
> Linux I get the exception shown below.
> [snip]
>
> Exception:
> -----------------------------------
> ~/java/test > java -jar ByteGetterServer.jar
> ByteGetterServer exception: error during JRMP connection establishment;
> nested exception is:
> java.net.SocketTimeoutException: Read timed out
> java.rmi.ConnectIOException: error during JRMP connection establishment;
> nested exception is:
> java.net.SocketTimeoutException: Read timed out
> at
> sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:274)
> at
> sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:171)
> at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:313)
> at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
> at java.rmi.Naming.rebind(Naming.java:160)
> at
> test.java.basics.rmi.server.ByteGetterServer.main(ByteGetterServer.java:47)
> Caused by: java.net.SocketTimeoutException: Read timed out
> at java.net.SocketInputStream.socketRead0(Native Method)
> at java.net.SocketInputStream.read(SocketInputStream.java:129)
> at java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
> at java.io.BufferedInputStream.read(BufferedInputStream.java:201)
> at java.io.DataInputStream.readByte(DataInputStream.java:331)
> at
> sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:215)
> ... 5 more
> -------------------------------
- 9
- Error loading SolarisSerialHello
I tried running the examples on the following link on windows XP and
2000.
http://java.sun.com/products/javacomm/reference/docs/API_users_guide_3.html
Are those programs specific to solaris? Will they work on windows?
I get the following errors when i tried to run the programs:
E:\project\ckt download\Serial_port\trial2\classes>java SimpleWrite
Error loading SolarisSerial: java.lang.UnsatisfiedLinkError: no
SolarisSerialPar
allel in java.library.path
Caught java.lang.UnsatisfiedLinkError: readRegistrySerial while
loading driver c
om.sun.comm.SolarisDriver
Error loading SolarisSerial: java.lang.UnsatisfiedLinkError: no
SolarisSerialPar
allel in java.library.path
Caught java.lang.UnsatisfiedLinkError: readRegistrySerial while
loading driver c
om.sun.comm.SolarisDriver
port COM1 not found.
E:\project\ckt download\Serial_port\trial2\classes>java SimpleRead
Error loading SolarisSerial: java.lang.UnsatisfiedLinkError: no
SolarisSerialPar
allel in java.library.path
Caught java.lang.UnsatisfiedLinkError: readRegistrySerial while
loading driver c
om.sun.comm.SolarisDriver
Error loading SolarisSerial: java.lang.UnsatisfiedLinkError: no
SolarisSerialPar
allel in java.library.path
Caught java.lang.UnsatisfiedLinkError: readRegistrySerial while
loading driver c
om.sun.comm.SolarisDriver
port COM1 not found.
I get the following errors:
comm.jar is placed in:
%JAVA_HOME%/lib
%JAVA_HOME%/jre/lib/ext
win32com.dll is placed in:
%JAVA_HOME%/bin
%JAVA_HOME%/jre/bin
%windir%System32
javax.comm.properties is placed in:
%JAVA_HOME%/lib
%JAVA_HOME%/jre/lib
Environment variable PATH also points to comm.jar file. Please guide
me as to how I can correct the above errors.
Regards
Quad
- 9
- Internet Explorer ProblemCan you tell me why, when I click on a link in my email, it tries to bring
up IE6, but it is a blank window, and also brings up a window asking me to
open the web site pointed to by the link? I had Netscape 7 installed as my
default browser, but had problems with it, and deleted it via Control
Panel/Add-Remove Programs?
--
--
Thank You,
Robert Runkel
P.O. Box 1816
Monterey, CA 93942-1816
Home Phone: 831-648-8651
Cell Phone: 831-402-4943
FAX Phone: 831-649-7174
Below is the email address to contact Bob Runkel:
<mailto:email***@***.com>
- 11
- Root Object == OO !?! [Was: Re: My strange service with an error]Lew wrote:
> (I've read a definition that a language that enforces a single Object root
> type is "object-oriented", whereas a language like C++ that allows root
> types other than Object is "object-supporting".)
You do seem to have a talent for finding the most astounding drivel ;-) Where
did you find that particular crock of moonshine ?
-- chris
(P.S. I don't at all dispute that C++ is better described as "supporting OO"
than as being an OO language -- but that's nothing at all to do with its lack
of a single root class.)
- 14
- benchmarks? java vs .net (binarytrees)On Sat, 7 Jun 2008 17:44:18 -0700 (PDT), kwikius
<email***@***.com> wrote:
>Java, .NET starts out slow buddy.. King Twat, Mr Skeet, Mr Harrop and
>you shoved a lot of time, figuring out what we already know for last
>10 years. Your only option... you turn off GC. Fucking unacceptable
>for any multi user system. Only way to get any sort of performance out
>of GC system is to hog the system.
>
>Have a nice fuckin' day.
>
>Oh and Fuck Off Ratboy..
lol ...
I added the C++ group back. If you are going to troll, keep all the
groups on the list.
Or are you ashamed?
- 14
- GridBagLayout on JDesktopHi,
I have problems using GridBagLayout for positioning JInternalFrames on a
JDesktop.
For instance, I have 2 JInternalFrames and I neither set the size nor the
preferedSize of the InternalFrame because I thought my JInternalFrames would
get the size from the GridBagLayout-manager but it doesn't work at all.
[...]
desktop = new JDesktopPane();
gbl = new GridBagLayout();
desktop.setLayout(gbl);
content.add(desktop);
[...]
GridBagConstraints gbc1 = makegbc(0, 0, 1, 5);
gbl.setConstraints(treeIFrame, gbc1);
desktop.add(treeIFrame);
GridBagConstraints gbc2 = makegbc(1, 0, 4, 1);
gbl.setConstraints(tableIFrame,gbc2);
desktop.add(tableIFrame);
[...]
the makegbc is nothing more than:
private GridBagConstraints makegbc(int x, int y, int width, int height)
{
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = x;
gbc.gridy = y;
gbc.gridwidth = width;
gbc.gridheight = height;
gbc.insets = new Insets(1, 1, 1, 1);
return gbc;
}
Can anyone give me some hints?
Thx in advance
Thomas Pototschnig
- 16
- specifying import, is there a difference in memory usage?
Does it matter if you say
import java.awt.*
or
import java.awt.<the exact file you want>
I am used to specifying the wild card and was wondering if I am using
more memory at run time than I need to or if it doesn't matter as the
compiler takes care of it. Any other reasons for using ones way over
the other?
Thanks in advance,
Russell
- 16
|
| Author |
Message |
RC
|
 Posted: 2007-4-25 23:02:00 |
Top |
java-programmer, How to gray out the files in JFileChooser?
I only let user select the directories,
not let user select the files.
So I
myFileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
That is fine, but user complain about that, they want to
make sure there are files under the directory.
If I do
myFileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
Then user will mistake select a file, which I don't let them select a
file. I need to popup a dialog says "Please select a directory only".
The idea thing is I can gray out the file names, so user can see
there are files under a directory, but they can't select any file,
only can select a directory.
Anyone out there has any idea how to gray out the file names in
JFileChooser?
Thank Q!
|
| |
|
| |
|
|
| Posted: 2007-4-26 2:21:00 |
Top |
java-programmer >> How to gray out the files in JFileChooser?
continue to show only directories like you have.
but, use a filter to only show directories that contain files.
there is documentation on this in the java api docs.
http://java.sun.com/j2se/1.5.0/docs/api/javax/swing/JFileChooser.html
|
| |
|
| |
|
| |
|
Index ‹ java-programmer |
- Next
- 1
- Making a variable an objectInside a class, amongst other variables, I have a variable 'orientation'
which can hold three valid values: horizontal, vertical, and no orientation.
In true oo design, should i bother creating a Orientation nested class
just for the variable no matter how small the class is?
- 2
- Contructor bad practices----WAS: Re: Can someone use invokeLater()...Alex Hunsley coughed up:
...[rip]...
>> Overly strict. I cannot /count/ the number of times I've seen
>> horribly convoluted code set out to avoid putting nearly /anything/
>> into a constructor.
>
> "Constructors should *not* call non-final or
> non-private methods" is not overly strict
STOP RIGHT THERE.
You meant: should *not* call non-final or non-private methods of that same
object? Sorry, I misunderstood your intent.
Then I totally agree.
Here's something else I see *all the time*: (pseudo-java, ignore scoping
rules):
class A
{
A() { helper(); }
helper() {....};
}
class B extends A
{
helper() {....}; // dangerous: overridden
}
...[rip]...
--
Framsticks. 3D Artificial Life evolution. You can see the creatures
that evolve and how they interact, hunt, swim, etc. (Unaffiliated with
me). http://www.frams.alife.pl/
- 3
- endeavorsYou should all JUMP UP AND DOWN for TWO HOURS while I decide on a NEW
CAREER!!
- 4
- Problem reading file from applet!Hello!
I'm not too experienced in java and I have a problem reading from a file
with my applet. As I understand the applet is aloud to read from the same
folder as the applet is in.
I have declared a File (that point to my file in the same folder), a
FileReader with try and catch Exception and then I have written
FileReader.read(char c, int, int) with try and catch. The compiler accepts
my code but when I run my applet in appletviewer the promt gives me errors.
Can somebody please help me?
Many, many thanks in advance!
Best regards
Marcus
- 5
- Workaround for JDialog memory leak in jdk1.6.0_02?I just submitted a bug report on a memory leak that I discovered in 1.6 (I
tested with 1.5 and there is no memory leak). What I am wondering is if
anyone has encountered this bug and if so if there is any better workaround
which I will describe shortly?
Basically one would first create a JFrame and then have a modal child dialog
(e.g,. PrimaryChildDialog) hanging off of it and then create another modal
child dialog (e.g., SecondardChildDialog) which hangs off the first modal
child dialog. Now one would close/dispose SecondaryChildDialog and then
close/dispose PrimaryChildDialog and then set PrimaryChildDialog to null.
Now if one repeats the above process n times one would see n
PrimaryChildDialog objects occupying memory (i.e.,
PrimaryChildDialog.finalize method never gets called and it is also returned
in the array of Window objects from the Windows.getWindows() method).
For example here is a code snippet for creating/showing and then disposing
PrimaryChildDialog:
public void openPrimaryChildDialog ()
{
fPrimaryChildDialog = new PrimaryChildDialog(getFrame (),
"Primary Child Dialog...", true);
fPrimaryChildDialog.openDialog ();
fPrimaryChildDialog.dispose ();
fPrimaryChildDialog = null;
// Note: there should be a better way of causing Java to IMMEDIATELY
// release the fPrimaryChildDialog resource! ==> Ugh!
getFrame ().dispose ();
Runtime.getRuntime ().runFinalization ();
getFrame ().setVisible (true);
}
In Java 1.5 PrimaryChildDialog's finalize method is correctly called each
time but in 1.6 there are n instances of PrimaryChildDialog and its finalize
method is never called. Oh yes, I got the following cool piece of code to
guarantee that the memory was indeed flushed which I called everytime I
disposed of PrimaryChildDialog:
private void flushMemory(PrintStream pPrintStream)
{
pPrintStream.println ("\nFlush memory begin:");
//Use a vector to hold the memory.
Vector v = new Vector();
int count = 0;
//increment in megabyte chunks initially
int size = 1048576;
//Keep going until we would be requesting
//chunks of 1 byte
while(size > 1)
{
try
{
for (; true ; count++)
{
//request and hold onto more memory
v.addElement( new byte[size] );
}
}
//If we encounter an OutOfMemoryError, keep
//trying to get more memory, but asking for
//chunks half as big.
catch (OutOfMemoryError bounded){size = size/2;}
}
//Now release everything for GC
v = null;
//and ask for a new Vector as a new small object
//to make sure garbage collection kicks in before
//we exit the method.
v = new Vector();
// Let's run gc anyhow...
Runtime.getRuntime ().gc ();
pPrintStream.println ("\nFlush memory end.");
}
The only workaround that I could think of is to minimize the memory impact
by calling the JDialog's getContentPane().removeAll () method as well as any
hard references in the class which I extended so that at least those items
can be garbage collected.
Does anyone have any better workaround and has anyone encountered this
problem?
If anyone is interested I can send the small test case (4 small Java files)
that I just submitted to Sun.
Karl
- 6
- 64 bit linux on VM to run Java appOn Fri, 20 Jun 2008 15:58:35 GMT, Roedy Green
<email***@***.com> wrote, quoted or indirectly quoted
someone who said :
>
>see http://mindprod.com/bgloss/sixtyfourbit.html
Thanks for all your input in whipping that entry into shape.
--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com
- 7
- ServletOutputStream to Browser OK in NS, but not IE??Hi All,
I am replacing a Netscape Application Server appLogic with a servlet.
The servlet is supposed to take a URL and stream the file to the
user's browser. I checked a number of examples from post in this news
group to get examples of how to do this (thanks for the good info).
The servelt works fine in NetScape 7.0 (jpg, pdf, html files open in
the current browser session), but always pops up the file download box
in IE 6. In IE the file is always downloaded and opened. This
happens even for html files. This is a problem, since the appLogic
opens most files in the browser, Word docs get opened in a separate
instance of MS Word. However, the user never sees the download box.
I tried modifiying the web.xml for this servelet to allow adding the
filename to to be appended to the servlet name,
GetContentItem/filename.jpg, but that didn't make any difference. The
content type and filename appear appear in the download dialog.
Here is the servelt code, any suggestions will be appreciated:
public class GetContentItem extends HttpServlet {
// initalise the servlet within init()
private static Log log = LogFactory.getLog(GetContentItem.class);
public void doGet(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, IOException {
if (log.isDebugEnabled())
log.debug("IN " + GetContentItem.class + " doGet" );
String sCRBaseURLRoot =
"http://supporttest1.web.lucent.com:20101/cr/";
String sDocPath = "Live/Product/5ESS/R16/Retrofit_Information/090094058001c628.jpg";
String sDocPath2 =
"Live/Product/5ESS/R16/Release_Information/0900940580026c41/french.pdf";
String sDocPath3 =
"/Live/Product/5ESS/R16/Release_Information/0900940580026cc1/spanish.doc";
String sDocPath4 =
"/Live/Product/5ESS/R16/Release_Information/090094058002791c/61402_Release_Deployment.html";
String filename = "090094058001c628.jpg";
String filename2= "french.pdf";
String filename3= "spanish.doc";
String filename4 = "61402_Release_Deployment.html";
sDocPath=sDocPath4;
filename = filename4;
String sUrl = sCRBaseURLRoot + sDocPath;
java.io.InputStream in=null;
ServletOutputStream stream = null;
try{
URL u = new URL(sUrl);
URLConnection c = u.openConnection();
c.connect();
in = new DataInputStream(c.getInputStream());
String sHeaderField=null;
String sHeaderFieldKey=null;
int i = 1;
stream = response.getOutputStream();
response.setContentType(c.getContentType());
response.setContentLength(c.getContentLength());
response.setHeader("Content-disposition","attachment;filename=\"" +
filename + "\"");
int bytes_read;
int BUFSIZE = 8192;
byte[] buffer = new byte[BUFSIZE];
while((bytes_read=in.read(buffer,0,BUFSIZE))!=-1){
stream.write(buffer,0,bytes_read);
}
} catch(FileNotFoundException e){
log.error("FileNotFoundException accessing document " + sDocPath +
e );
} catch(Exception e){
log.error("Exception accessing document " + sDocPath + e );
} finally{
try{
in.close();
stream.flush();
stream.close();
} catch (Exception e){}
}
}
}
I hope the code display format is not too ugly in the post.
Thanks,
Tom
- 8
- cerat warI use jbuider 4 and I made a web application project. But I don't know how I
can get a war file from my project. Can somebody help me?
- 9
- Eclipse _mthclass$ problemI have an issue with Eclipse not adding a static Class called
_mthclass$ to my compiled class file and when I compile the same
source using Ant with jdk 1.3 or 1.4 it adds this _mthclass$. I read
that Eclipse has its own javac to compile class files and that you
cannot change this. My classes are now incompatible during
Serialization. Has anyone come across a way to get Eclipse to add this
class or a work around?
- 10
- Write formatted XML to a fileHi,
I create the XML with DOM and save it to a file. But when I open such
file with Notepad, for instance, I see the XML file in one line - it
is not formatted/aligned. If I open it with IExplorer it looks fine.
I am looking for the way to save XML to a file so that XML would be
formatted.
The save code:
-------------------
doc.getDocumentElement().normalize();
DOMSource ds = new DOMSource(doc);
StreamResult sr = new StreamResult(out);
TransformerFactory tf = TransformerFactory.newInstance();
Transformer trans = tf.newTransformer();
trans.transform(ds, sr);
Thanks,
Pavel
- 11
- 12
- Question about string pattern matchingRoedy,
Roedy Green wrote:
>On Mon, 09 Jan 2006 21:40:00 -0600, Alan Krueger
><email***@***.com> wrote, quoted or indirectly quoted someone
>who said :
>
>>If you insist on writing this yourself, study finite automata and
>>regular languages. Build a tool that translates regular expressions
>>into non-deterministic finite automata (NFAs) then transforms those into
>>optimized deterministic finite automata (DFAs). Make it so these are
>>compiled into Java source or bytecode directly for speed.
>
>or use a generated parser. See http://mindprod.com/jgloss/parser.html
>
>Also see http://mindprod.com/jgloss/finitestate.html
The resources are very useful!
regards,
George
--
Message posted via http://www.javakb.com
- 13
- updating value in all sessionHi, I am a little stumped on this one, and I was hoping someone else
out there ran into and solved this problem. Using a J2EE servlet
container every client (browser) will acquire a session and certain
values will be stored in this session. However, if a certain
parameter is changed it should invoke a method in one of the beans in
the session, which all sessions will have. This sounds like more like
a type of event handler, but I am not aware of any non-gui event
listeners. Any ideas?
Regards,
Brian
- 14
- Drag'n'Drop & Using Drag ImagesI have a situation where I want to be able to drag a component (or an image
of one) from one container to another. Using the excellent beginner article
at
http://java.sun.com/products/jfc/tsc/articles/dragndrop/
I have got this working in my own sample; the drag operation begins, and I
can react to the item being dropped.
The sample given uses
DragGestureEvent.startDrag(Cursor dragCursor, Transferable transferable,
DragSourceListener dsl)
This works fine, I get the change in cursor to represent the drag. Now I
want to actually have an image dragged with the cursor / in place of the
cursor (I don't mind which), so I adapted my working sample to instead use
DragGestureEvent.startDrag(Cursor dragCursor, Image dragImage, Point
imageOffset, Transferable transferable, DragSourceListener dsl)
However, there is no change: no image is dragged, it still just changes the
cursor. No exceptions are generated, and the drag still proceeds as normal.
I can see that the Image object (whose reference is being passed) is valid.
I tried a Point of (10, 10) (not sure whether this represents cursor hotspot
offset from image top-left or vice versa, or even something entirely
different) and of (0, 0) instead when that didn't work ( (0, 0) seems safe
in all cases).
I delved into the source code just a little to see if there was anything
obvious, such as the image needing to be of a specific size or format or
something; a cursory glance only shows that the image gets passed down the
line, and there are no comments on whether it should be a special type of
image or just any old image.
So I'm a little stuck. Anyone got any ideas for why it doesn't use the
supplied image? Have I missed a step?
WinXP Pro SP1
Java 1.4.2_03
--
- 15
- Print a XML string to browser doesn't work in JSPxmlReq is the XML string, and I want to print it out in browser, but it doesn't
print it out. But when I go to view|source, then I could see the XML.
<%
String xmlReq = generateXML();
out.println(xmlReq);
%>
any ideas? please help. thanks!!
|
|
|
