| graphic rendering question |
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- 1
- Timouts for RMIHi all,
i know there are several posts, and a google search found lots of hits on this topic.
My Problem is: Nothing works...
My intension is very simple:
Use Rmi to transmit data from a client to a server.
In principle it works fine. My Problem are the RMI-timeouts. They are too long.
I have to take into account that some "unclever Guy" pulled the network plug.
My Client still wants to send data to the Server (call a servermethod via rmi).
I call the method and this thread is blocked. Fine. Network is still broken.
Depending on the OS of the client (windows, linux) the Timeouts vary.
In Windows its about 20 Sec => Exception. In Linux? Years? It looks like the method never returns
with an error.
Is there a way to set the timeout for calling a method.
(The time after the methodcall returns an error when the server isn't reachable)
I tried:
a) Setting the RMISocketFactory creating my own clientsockets having the SoTimeout set... didnt work.
b) setting the Systems sun.rmi.transport.connectionTimeout ... didnt work
Hope you can help me.
- 1
- Setting namespaces in DOMHi all,
I'm trying to construct an XML (SOAP) document, with a number of namespaces.
DOM provides Document.createElementNS(), which can be used to add the
namespace in the particular element. However, I often get the case where
the namespace definition is repeated in multiple sibling elements, while
it would be a lot simpler (cleaner?) to define the namespace only once
at a higher level.
I tried using
document.getRootElement().setAttribute("xmlns:xsd", XSD_NS);
but, even though the document.toString() shows the correct xmlns:xsd
attribute in the root node, it is still repeated in the lower level
elements.
Does anyone have any idea of how the DOM decides when to "roll-up" a
namespace definition to a higher level? Or how to tell it to?
I'm talking about the difference between:
<rootnode>
<childnode xsi:type="xsd:int" xmlns:xsi="http://w3c.blah"/>
<childnode xsi:type="xsd:int" xmlns:xsi="http://w3c.blah"/>
<childnode xsi:type="xsd:int" xmlns:xsi="http://w3c.blah"/>
</rootnode>
and
<rootnode xmlns:xsi="http://w3c.blah">
<childnode xsi:type="xsd:int"/>
<childnode xsi:type="xsd:int"/>
<childnode xsi:type="xsd:int"/>
</rootnode>
Many thanks.
Rogan
- 1
- Problem invoking servletHello.
I'm trying to invoke a servlet. I get the following error:
javax.servlet.ServletException:
[HTTP:101250][ServletContext(id=371807,name=BibleApp,context-path=/BibleApp)
]: Servlet class /com/brainysoftware/burnaby/ControllerServlet for servlet
ControllerServlet could not be loaded because a class on which it depends
was not found in the classpath
C:\bea\user_projects\infologic1\applications\BibleApp;C:\bea\user_projects\i
nfologic1\applications\BibleApp\WEB-INF\classes.
java.lang.NoClassDefFoundError:
/com/brainysoftware/burnaby/ControllerServlet (wrong name:
ControllerServlet).
at weblogic.servlet.internal.ServletStubImpl.prepareServlet
----------
web.xml
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application
2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>simple</servlet-name>
<jsp-file>simplePage.jsp</jsp-file>
</servlet>
<servlet>
<servlet-name>ControllerServlet</servlet-name>
<servlet-class>com.brainysoftware.burnaby.ControllerServlet</servlet-class>
<!-- Define initial parameters that will be loaded into
the ServletContext object in the controller servlet -->
<init-param>
<param-name>base</param-name>
<param-value>http://localhost:7001/BibleApp/ControllerServlet</param-value>
</init-param>
<init-param>
<param-name>jdbcDriver</param-name>
<param-value>weblogic.jdbc.mssqlserver4.Driver</param-value>
</init-param>
<init-param>
<param-name>imageUrl</param-name>
<param-value>http://localhost:7001/BibleApp/images/</param-value>
</init-param>
<init-param>
<param-name>dbUrl</param-name>
<param-value>jdbc:weblogic:mssqlserver4:users@COMPAQSERVER</param-value>
</init-param>
<init-param>
<param-name>dbUserName</param-name>
<param-value>dinesh</param-value>
</init-param>
<init-param>
<param-name>dbPassword</param-name>
<param-value>werty69</param-value>
</init-param>
</servlet>
<servlet>
<servlet-name>test</servlet-name>
<jsp-file>menu_1.jsp</jsp-file>
</servlet>
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>HelloServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>ShowEmployees</servlet-name>
<servlet-class>ShowEmployees</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/helloservlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>test</servlet-name>
<url-pattern>/test</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>simple</servlet-name>
<url-pattern>/simple</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ShowEmployees</servlet-name>
<url-pattern>/ShowEmployees</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ControllerServlet</servlet-name>
<url-pattern>/controlIt</url-pattern>
</servlet-mapping>
</web-app>
--------------
ControllerServlet.class
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import com.brainysoftware.burnaby.DbBean;
public class ControllerServlet extends HttpServlet {
/**Initialize global variables*/
public void init(ServletConfig config) throws ServletException {
System.out.println("initializing controller servlet.");
ServletContext context = config.getServletContext();
context.setAttribute("base", config.getInitParameter("base"));
context.setAttribute("imageUrl", config.getInitParameter("imageUrl"));
// instantiating the DbBean
DbBean dbBean = new DbBean();
// initialize the DbBean's fields
dbBean.setDbUrl(config.getInitParameter("dbUrl"));
dbBean.setDbUserName(config.getInitParameter("dbUserName"));
dbBean.setDbPassword(config.getInitParameter("dbPassword"));
// put the bean in the servlet context
// the bean will be accessed from JSP pages
context.setAttribute("dbBean", dbBean);
try {
// loading the database JDBC driver
Class.forName(config.getInitParameter("jdbcDriver"));
}
catch (ClassNotFoundException e) {
System.out.println(e.toString());
}
super.init(config);
}
/**Process the HTTP Get request*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**Process the HTTP Post request*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String base = "/jsp/";
String url = base + "Default.jsp";
String action = request.getParameter("action");
if (action!=null) {
if (action.equals("search"))
url = base + "SearchResults.jsp";
else if (action.equals("browseCatalog"))
url = base + "BrowseCatalog.jsp";
else if (action.equals("productDetails"))
url = base + "ProductDetails.jsp";
else if (action.equals("productDetails"))
url = base + "ProductDetails.jsp";
else if (action.equals("addShoppingItem") ||
action.equals("updateShoppingItem") ||
action.equals("deleteShoppingItem") ||
action.equals("displayShoppingCart"))
url = base + "ShoppingCart.jsp";
else if (action.equals("checkOut"))
url = base + "CheckOut.jsp";
else if (action.equals("order"))
url = base + "Order.jsp";
}
RequestDispatcher requestDispatcher =
getServletContext().getRequestDispatcher(url);
requestDispatcher.forward(request, response);
}
}
- 4
- Java and assemblyHI everyone,
Is there a possible relation between Java and assembly language like ther
is with JNI?
--
Thanks for your attention.
Jean Pierre Daviau
- 10
- Problem with browser tabs and sessionsI have a application make in jsp tomcat 4.1.
the customer fill some forms and the data in store in session.
The problem is that if customer open new tab(ie or firefox) and see
info another product when he change for tab initial and submit, the
system will rise error because some data of session was changed.
How i can fix it ?
I need each tab have your new session, there are any config in tomcat
for make it ?
thanks a lot
- 10
- Question concerning jh_manifestHi Matthew,
I have further researched this problem. To me it seems a (not too
trivial) bug in jh_manifest. See
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=489214. Maybe better to
discuss the topic there to keep this list clean...
Cheers,
Florian
--
To UNSUBSCRIBE, email to email***@***.com
with a subject of "unsubscribe". Trouble? Contact email***@***.com
- 10
- directory questionI have a file named "main.ini" in the directory of jar (self-executable
package)
When I run jar from its directory all ok
When I run jar from another directory it cannot found "main.ini"
I open "main.ini" with
InputStream is = new FileInputStream("main.ini");
but I understand I must open it with
InputStream is = new FileInputStream(getDirectoryOfJavaProgram() +
"main.ini");
can you implement
getDirectoryOfJavaProgram()???
thanks!
- 10
- Bug in childrenNames() api for Preference class?Hi,
The following code trhrows an Illegal Argument Exception.
import java.uitl.prefs.*;
try{
String xyz[] = (Preferences.userRoot()).childrenNames();
} catch (Exception e) {
e.printStackTrace();
}
The exception caught is :
java.lang.IllegalArgumentException: String length must be a multiple
of four.
at java.util.prefs.Base64.base64ToByteArray(Base64.java:134)
at java.util.prefs.Base64.altBase64ToByteArray(Base64.java:126)
at java.util.prefs.FileSystemPreferences.nodeName(FileSystemPreferences.java:859)
at java.util.prefs.FileSystemPreferences.access$1900(FileSystemPreferences.java:33)
at java.util.prefs.FileSystemPreferences$10.run(FileSystemPreferences.java:640)
at java.security.AccessController.doPrivileged(Native Method)
at java.util.prefs.FileSystemPreferences.childrenNamesSpi(FileSystemPreferences.java:632)
at java.util.prefs.AbstractPreferences.childrenNames(AbstractPreferences.java:699)
at test.main(test.java:9)
Is this a BUG in java?
My requirement is that I have many NODES under the root node of user
preferences(userRoot).I want the list of nodes, for futher
processing.How do i retrieve them?
Please help.
(Also send a cc to my email:email***@***.com)
Thanks,
Prakash.
- 11
- No call for Ada (was Announcing new scripting/prototyping language)Josh Sebastian wrote:
> Maybe you just weren't very good at C++ templates. I don't mean to be
> insulting, but personal preferences do play a huge roll here. Unless
> someone can prove Ada's generics are Turing-complete, though (a quick
> google doesn't turn up anything), I'd say that we'll have to call C++
> templates more powerful.
Turing completeness is only one measure of power. And not a very
good one for measuring different systems of templates. If you use
templates for any sort of computational programming beyond some
very simple things you are stretching the rubber band beyond its
limit.
--
Thomas.
- 11
- BUG in jre that work fine in jview - mouseEventAnyone come up with an answer to this?
I'm having the same problem, I've created
a "skin" slider control in J++, when I use
Microsoft it returns coordinates relative to
the slider control, when I use Sun it's relative
to the applet, the listener class and handler is
within the slider control class.
I've found LOTS of examples online that are setup
just like my code, and they all, including Sun's
documentation (as well as Microsoft's) say it should
be relative to the control.
Thanks,
EdisonCPP
Nir melamoud wrote:
> Hi,
>
> Can anyone please explain me how can i write an application that
> use the mouseEvent.getX(),mouseEvent.getY() functions on both sun jre
> and microsoft jview without checking for the interpreter origin ?
>
> In jview the function return the coordinate relative to the component
top
> left point = (0,0)
>
> In jre it return in mouseEnter relative to the beginning of the
screen (not
> even the window)
> and in mouseExit relative to the component top left point ?
>
> It look like a bug in jre, because sun help support microsoft version
-
> relative to the source component.
>
> Does anyone know how can i translate these points so it will work on
both
> jview and jre ?
>
> here is a small code example: try to enter and exit the frame and see
the
> printout, try it on jre and jview
>
> import java.awt.* ;
> import java.awt.event.* ;
> import java.io.*;
> import jclass.bwt.*;
>
> class mouse extends Frame {
> public static void main(String arg[]) {
> mouse m = new mouse("Mouse Test") ;
> m.setSize(400,300) ;
> m.setVisible(true);
> }
>
> public mouse(String s) {
> super(s) ;
> enableEvents(AWTEvent.MOUSE_EVENT_MASK);
> }
>
> public void processMouseEvent(MouseEvent m) {
> System.err.println("x,y = " + m.getX() + "," + m.getY()) ;
> }
> }
- 12
- 12
- Fourier Transform with JavaHello,
I'm searching an effective Java library which offers Fourier Transform
methods.
Has someone used a library like this please ?
Thanks
CABA
- 12
- 13
- another design question, abstract static methods...so here is another general question about java...
why can't you declare an abstract static method.
i can envision the case (indeed i have experienced the case) where one
would want an abstracct superclass, with an abstract method such that all
subclasses that implement this method make that method static.
basically, the abstract class declares an abstract method that should be
static for all implementations (for example a factory method).
this isn't allowed in java, and in the language specification, there is no
reason given as to why. it is just simply stated in a single sentence
that an abstract method cannot be static. (or it turns out even the
implemented method).
can anyone explain why this isn't allowed? (i.e. give an example that
shows the flaws that can arise from such a situation).
thanks much!
murat
--
Murat Tasan
email***@***.com
email***@***.com
email***@***.com
http://genomics.cwru.edu
- 15
- How to get files files which were last usedHi,
is it possible to determine the files which were last used from
different applications (e.g. "readme.txt was used in the last 2 hours")
on MAC with Java by default System calls?
Or is this only possible by writing a sort of "trigger" application?
Thanks,
Peter Vermeer
|
| Author |
Message |
Scott
|
 Posted: 2004-7-11 13:58:00 |
Top |
java-programmer, graphic rendering question
Hi All,
I am investigating writing a Java application to render postscript into a
Graphics2D object (or other suitable alternative). Has anyone had any
experience with this sort of thing? I have come across a number of
libraries that work in the other direction (i.e. Graphics2D to postscript
or PDF), but none for what I have in mind. Could anyone suggest some
possibilities? Thanks very much.
Best regards,
Scott
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Thomas Weidenfeller
|
| Posted: 2004-7-12 15:24:00 |
Top |
java-programmer >> graphic rendering question
Scott wrote:
> I am investigating writing a Java application to render postscript into a
> Graphics2D object (or other suitable alternative). Has anyone had any
> experience with this sort of thing? I have come across a number of
> libraries that work in the other direction (i.e. Graphics2D to postscript
> or PDF), but none for what I have in mind. Could anyone suggest some
> possibilities?
You know that PostScript is a non-trivial language? There is some
serious programming ahead of you. E.g. a PostScript RIP like ghostscript
consists of 50 MB (yes, MegaBytes) of source code - compressed ... These
50 MB includes many drivers, so the RIP might only be 10 MB or 20 MB
source code - still compressed.
If you want to do it, get a good book about FORTH, since PostScript
borrowed a lot from that language. And of course get Adobe's PostScript
Language reference book (approx. 900 pages). The book is also known as
"The Red Book" or just "The PostScript Bible".
You could also have a look at Sun's attempt at it (the demo can just
render three or four common PostScript demo images and barfs at
everything real PostScript):
http://java.sun.com/products/java-media/2D/samples/postscript/PostscriptDemo.zip
Good Luck. You need it.
/Thomas
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Roedy Green
|
| Posted: 2004-7-13 3:24:00 |
Top |
java-programmer >> graphic rendering question
On Sun, 11 Jul 2004 05:58:13 GMT, Scott <email***@***.com> wrote or
quoted :
>I am investigating writing a Java application to render postscript into a
>Graphics2D object (or other suitable alternative). Has anyone had any
>experience with this sort of thing? I have come across a number of
>libraries that work in the other direction (i.e. Graphics2D to postscript
>or PDF), but none for what I have in mind. Could anyone suggest some
>possibilities? Thanks very much.
Writing an PS rendering engine is a big job. You could have a look at
GhostScript http://mindprod.com/jgloss/ghostscript.html
I think it is open source. At least they let you look at the source.
PS is a full blown language in its own right, something like Forth,
RPN Stack based. You are attempting something on the same order of
difficultly as implementing a JVM and a set of native classes.
--
Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.
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Scott
|
| Posted: 2004-7-13 5:34:00 |
Top |
java-programmer >> graphic rendering question
On Mon, 12 Jul 2004 09:24:28 +0200, Thomas Weidenfeller wrote:
> You could also have a look at Sun's attempt at it (the demo can just
> render three or four common PostScript demo images and barfs at
> everything real PostScript):
>
> http://java.sun.com/products/java-media/2D/samples/postscript/PostscriptDemo.zip
>
>
Thanks for the link. I should perhaps have been a bit more specific with
my request to prevent the "are you crazy!?" responses! I have quite a bit
of PostScript programming experience, and I have already written a
graphics application that saves its output as postscript (in C++). It
actually uses a very minimal subset of PostScript (mainly just simple
math, some moveto, lineto and curveto stuff plus text). So the java app
would not even begin to approach a full featured postscript interpreter
like ghostscript, but instead be just enough to render the output of my
graphics program. I was hoping that a library might already exist that I
could use, but it looks like I will have to do it from scratch.
Best,
Scott
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Thomas Weidenfeller
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| Posted: 2004-7-13 16:26:00 |
Top |
java-programmer >> graphic rendering question
Scott wrote:
> my request to prevent the "are you crazy!?" responses!
These are the moments when I regret that I answered a question. Don't
worry, won't happen again.
BTW: if you can't live with the answer(s), don't ask in public.
/Thomas
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Scott
|
| Posted: 2004-7-16 0:44:00 |
Top |
java-programmer >> graphic rendering question
On Tue, 13 Jul 2004 10:25:36 +0200, Thomas Weidenfeller wrote:
> Scott wrote:
>> my request to prevent the "are you crazy!?" responses!
>
> These are the moments when I regret that I answered a question. Don't
> worry, won't happen again.
>
> BTW: if you can't live with the answer(s), don't ask in public.
I think you completely misunderstood my response. Perhaps I should have
included a smiley face :-)? You offered a valuable link, and I thanked
you for it. All I was trying to convey was that both responses to my
question were along the lines of 'that's going to be a big job and I hope
you know what you are in for'. I then just wanted to confirm that I
wasn't really as crazy as I may have seemed, and to clarify my question a
bit. Sorry you took offence.
Best,
Scott
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Liz
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| Posted: 2004-7-16 8:06:00 |
Top |
java-programmer >> graphic rendering question
"Scott" <email***@***.com> wrote in message
news:email***@***.com...
> On Tue, 13 Jul 2004 10:25:36 +0200, Thomas Weidenfeller wrote:
>
> > Scott wrote:
> >> my request to prevent the "are you crazy!?" responses!
> >
> > These are the moments when I regret that I answered a question. Don't
> > worry, won't happen again.
> >
> > BTW: if you can't live with the answer(s), don't ask in public.
>
> I think you completely misunderstood my response. Perhaps I should have
> included a smiley face :-)?
Smiley faces are reserved now for student grades instead of A..F
That way everyone gets into college.
> You offered a valuable link, and I thanked
> you for it. All I was trying to convey was that both responses to my
> question were along the lines of 'that's going to be a big job and I hope
> you know what you are in for'. I then just wanted to confirm that I
> wasn't really as crazy as I may have seemed, and to clarify my question a
> bit. Sorry you took offence.
>
> Best,
> Scott
>
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ak
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| Posted: 2004-8-5 11:56:00 |
Top |
java-programmer >> graphic rendering question
> actually uses a very minimal subset of PostScript (mainly just simple
> math, some moveto, lineto and curveto stuff plus text). So the java app
> would not even begin to approach a full featured postscript interpreter
> like ghostscript, but instead be just enough to render the output of my
> graphics program. I was hoping that a library might already exist that I
> could use, but it looks like I will have to do it from scratch.
scott, this library really exists:
see here http://www.acme.com/java/software/Acme.Psg.html
--
Andrei Kouznetsov
http://uio.dev.java.net Unified I/O for Java
http://reader.imagero.com Java image reader
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Liz
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| Posted: 2004-8-5 12:37:00 |
Top |
java-programmer >> graphic rendering question
"ak" <email***@***.com> wrote in message news:cesb4h$gjs$email***@***.com...
> > actually uses a very minimal subset of PostScript (mainly just simple
> > math, some moveto, lineto and curveto stuff plus text). So the java app
> > would not even begin to approach a full featured postscript interpreter
> > like ghostscript, but instead be just enough to render the output of my
> > graphics program. I was hoping that a library might already exist that
I
> > could use, but it looks like I will have to do it from scratch.
>
> scott, this library really exists:
> see here http://www.acme.com/java/software/Acme.Psg.html
I just checked this site. I wanted to make some simple postscript
graphics pages (great for forms and such) and so I started to write
my own postscript methods. Well after a little while I ended up
with little kludges here and there, cuz I didn't really do any
design, just hacking. This package might be just what I need
to do it right.
>
> --
> Andrei Kouznetsov
> http://uio.dev.java.net Unified I/O for Java
> http://reader.imagero.com Java image reader
>
>
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Index ‹ java-programmer |
- Next
- 1
- jar file for classhello all
i have some code where the class XMLSignatureFactory is used.
apparently this is exposes signing mechanism. however i am unable to
find out the jar file that will contain the required interfaces/
implementation.
can someone please tell me from where can i download the corresponding
jar file ? Also what is the general technique used to find jar files
corresponding to a class file.
thanks
ravinder thakur
- 2
- JAI - Reduce memory requirements for TIF --> JPEG translationHi,
I'm using the following code, copied off the internet, to translate a
TIF file to JPEG format. It works, but runs out of memory on one of my
machines. I can "solve" that by giving Java more memory at launch, but
this is running in a context where I don't have easy access to those
parameters, so I would prefer to reduce the memory requirements for the
function. I'm still reading up on JAI and it's a lot to take in at one
time; I'd appreciate any pointers to more memory-efficient ways to go
about this. Thanks!
Peace,
--Carl
public static void main(String[] args) {
final String path = "//images//sample";
RenderedImage image = JAI.create("fileload", path + ".tif");
WritableRaster raster = image.copyData(null);
writeJpegFile(path + ".jpg", image, raster);
}
private static void writeJpegFile(
String filename,
RenderedImage image,
WritableRaster raster) {
BufferedImage bi = new BufferedImage(
image.getColorModel(),
raster,
true,
null);
BufferedImage bi2 = new BufferedImage(
bi.getWidth(),
bi.getHeight(),
BufferedImage.TYPE_BYTE_GRAY);
Graphics2D g2 = bi2.createGraphics();
g2.drawImage(bi, 0, 0, null);
PlanarImage pi = PlanarImage.wrapRenderedImage(bi2);
JAI.create(
"FileStore",
pi,
filename,
"JPEG",
new JPEGEncodeParam());
}
- 3
- Urgent: connection not made using JDBC Thin DriversDear friends:
following code just prints
Connecting to Oracle... & it doesnt prints ....Connected to oracle
statement.
I've given the code in try catch block but also it doesn't print any
exception
why??
System.out.println("connencting to Oracle....");
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn=
DriverManager.getConnection("jdbc:oracle:thin:@(DESCRIPTION
=(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = testserver.com)(PORT
= 1521)))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME =
testdb)))","test","test");
System.out.println(".....connencted to Oracle");
I've tried the above code with some changes for the database on the
same machine it works fine. But when I tries it for the db on the other
server it not works.
waiting for reply.....
- 4
- 5
- JNI , shared stubs, CFunction (not CFunc) ?Hi,
I've been reading about JNI and shared stubs at
http://java.sun.com/docs/books/jni/html/jniTOC.html
However, when i try to use the class "CFunction" (see 9.4.3 @ url) , my
compiler (IntelliJ) says it cannot find the class.
I did find a jnistb10.zip , containing CFunc, CMalloc, CPtr, and the C
code for "disp.dll". However, this zip contains "CFunc" instead of
"CFunction" ! This is fine for wrapping a simple C calling convention
function like "atol" (this example works with CFunc) , but i want to
wrap some "stdcall" win api functions. With CFunc i get an access
violation, probally due to the fact its not a C but a stdcall function.
So i've been searching for the new and improved classes, namely
CFunction , but unfortunally i cannot find it anywhere. Strange how it
seems to be part of the JVM since 1.2 , but just doesnt seem to be there.
Anyone who can help me ?
Thanks,
Rover
- 6
- Statusbar class in official library?Hi,
I couldn't find any class in the API reference realizing a statusbar,
which can be placed at the bottom of a window.
Is there really no such class in the Java Standard Library?
--
Matthias Kaeppler
- 7
- Games and algorithmsHello,
What could be a good book to start game programming with Java?
I'm mosty interested in algorithms used in games.
-a
- 8
- NetBean become very slow ...Hi, All:
Recently I'm using the Sun NetBean IDE 5.5.1 in Windows, and I found
it'll become very slowing when long time no operation then open it.
In task manager if long time no use then use the NetBean, the memory will
become low;
then open NetBean it increase the memory and diffucult to use the editor.
Fianlly it up to near 150M, then operation is smooth, would you tell me
what happend and how to avoid the memory decreasing ?
Regards. Ahan Hsieh
- 9
- Another easy one I thinkHey all,
I was hoping I could get some direction on another assignment. In the
programming comments I listed where I need a little help. Basically this
little prog won't display the minimum number and the average is wrong
because I don't know the syntax of how to subtract 1 from my counter when
the average computation is made.
/*
Java Program #3
*/
public class prog3
{
public static void main (String[] args)
{
int numinput, min, max, sum, count, finalmax, finalmin, finalsum;
double average;
count = 0;
numinput = 1;
min = 0;
max = 0;
sum = 0;
average = 0;
finalmax = 0;
finalmin = 0;
finalsum = 0;
while(numinput != 0) {
System.out.println();
numinput = Console.readInt ("Enter any number (enter 0 to stop): ");
min = numinput;
max = numinput;
sum = numinput;
if(max > finalmax) finalmax = max; // ** i think there is a problem in
these two if statements; how do i get it to do both?**
if(min < finalmin) finalmin = min; // **the final min is always being
reported as 0.
finalsum = sum + finalsum;
count = count + 1;
average = finalsum/count; //**anyone know the syntax here to subtract 1
from the count before the divison**
}
System.out.println();
System.out.println ("The maximum number is: " + finalmax);
System.out.println ("The minimum number is: " + finalmin);
System.out.println();
System.out.println ("The average is: " + average);
System.out.println("The count is: " + count);
}
}
TIA for any help!
- 10
- Mono, Java and the patentsThere's a new website for the so-called Mono-Project.
http://www.mono-project.com
<cite>
"
Mono is positioned to become the leading choice for development of Linux
applications as well as cross platform applications.
"
Translation:
"we consider Mono as the major Linux-development-platform"
"don't take Java for crossplatform-development, take Mono".
<cite>
"
However, the Java runtime systems commonly available on Linux
lack the performance that customers demand, and Java applications
do not conform to the Linux GUI look and feel.
"
Never heard of SWT or Swing-Synth-Look?
And Java is slow and Mono is fast? What's about a detailed benchmark?
Oh wait ... Mono is BETA and not optimized and whatever.
So we have no benchmarks but we pretend that Java is slow and sucks.
But more interesting is the following excipe from the Mono-FAQ:
http://www.mono-project.com/about/licensing.html
"
The core of the .NET Framework, and what has been patented
by Microsoft falls under the ECMA/ISO submission.
Jim Miller at Microsoft has made a statement on the patents
covering ISO/ECMA, (he is one of the inventors listed in the patent):
https://mailserver.di.unipi.it/pipermail/dotnet-sscli/msg00218.html
"
Once upon the time an unimportant and unknown Microsoft-employee
has made an unimportant statement on an unimportant mailing-list ...
and that makes Mono a safe project?
And Mono should be the major Linux-development-platform?
Based on such a statement?
Unbelievable.
Rob (citizen of EMEA)
- 11
- [List]Update of a List in a method (continued)I forgot to provide the calling line :
ArrayList<String>myList=new ArrayList<String>();
myList=upDateExistingIndiPathClassNameValuesList(indi,myList);
where probably is the problem !
Thanks.
- 12
- Detaching Applet to a Frame: the Frame is iconizedHi,
thank you all for your replies, I've used the BorderLayout
and GridBagLayout to get the exactly layout I wanted.
I have another, probably simple question: now I'd like
to be able to detach my applet from the browser on a
button click, so I've created a big panel to keep all
the components and a frame serving as external window:
void detach() {
but[1].setActionCommand("Attach");
but[1].setLabel("Attach");
frame.add(bigPanel);
frame.pack();
frame.setSize(Math.max(frame.getSize().width,
(int) (1.2 * getSize().width)),
Math.max(frame.getSize().height,
(int) (1.2 * getSize().height)));
frame.show();
frame.toFront();
}
void attach() {
but[1].setActionCommand("Detach");
but[1].setLabel("Detach");
add("Center", bigPanel);
validate();
frame.setVisible(false);
}
This seems to work quite well (I hope I don't leak memory)
with one small problem: after I click the "Detach" button
several times, the external frame always appears iconized
(at least in the KDE window manager that I use).
The frame.show() and frame.toFront() commands don't help.
The applet + source code are at http://pref.dyndns.org/grid/grid2.html
Any suggestions please?
Alex
- 13
- Java Applet ErrorHello.
I don't know much about Java, but we are having a problem on our
website. I don't currently have the actual error message, but I'm
just wondering if anyone can possibly point to where the problem might
lie just from this information.
When a user clicks on a button, a java applet is supposed to load.
This applet loads fine for all win98 users using IE6 or 5.5. We
didn't have to load any plugins for our Win98 machines. The applet
also worked w/ win2000,winnt,winxp using IE6, but with only one
specific version of an older of a java plugin (i think 1.4.0).
Anything older or newer than that plugin does not work.
We've tried the latest, I believe it is 1.4.2_04, and still it does
not work. It does work to a certain degree w/ netscape 7.0, but the
site was not designed for netscape and other features will not work.
I know this is very vague, but I'm clueless when it comes to java. I
was just wondering if maybe someone can just kinda give a prognosis
based on this info. I just thought it was kind of weird that it works
in our 98 machines, and with only one version of a java plugin in the
other o/s's. Do you think this is a code error? IIS? server or
directory setting?
Thanks in advanced,
Gloria
- 14
- ploting 2D graph and able to change at run time..(JFrame)
Hi everybody,
Sorry for not clear question in my last post.. and more thanks
for your reply..
The exact requirements in graph are..
1. The graph should have all feature of X & Y scale, grid, X
and Y label and multicurve.
2. The graph X & Y scale range should calculated at run time
(max and min)from X and Y array and display.
I hope these above requirements are understandable for little
while... I am not new for java but i am new for graph application.
So..can any one of you tell me where i get this kind of graph
packages or APIs for free?
..
regds,
G Nash
- 15
- new to genericsHello All-
In the past I have used java pre generics for some programs related
to my hobbies. I have come back to it after a couple of years and am
biting the bullet and moving to 1.5(5.0)...
In the past I have made some type specific packages to generate some
basic combinatoric structures (permutations, combinations, partitions)
For my own use and education, I'm trying to figure out how to make this
more usfully with generics.
Specifically:
class foo {...}
class otherClass{
HashSet<foo> fooSet;
// now comes the tricky (to me) part
Iterator<???> perm = new permutation(fooSet);
/*
I'd like to have iterator return one permuation of the elements in
fooSet at a time
*/
}
So... Does this type of thing already exist somewhere? If so where?
If not how do I go about using generics to do such a thing?
Thanks in advance
Collins
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