| basic question on Java in XP |
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- 4
- GUI and command lineHello,
I need to connect my GUI program with a terminal in Linux (command
line). The task is to input inside a textField the command to exectue as
for exemple: "ls -al" or "gcc whatever.c -o whatever" but everything
must be done by a GUI program.
How can I call the terminal or execute these commands?
thanks,
Marcelo
- 4
- public static final - compilation errorOn Tue, 28 Jun 2005 17:49:11 +0200, Kamil Roman wrote:
> Hi,
>
> is it possible to initialize a public static final member of a class in
> the class' constructor? I try to do this and I receive error message:
>
> variable PLUS is declared final; cannot be assigned.
{... code ...]
No, the static finals need to be initialized before that. Why don't you
use a static initializer block (static { /* ... */ }), which would be
called at class load, in which you can initialize your members.
--
You can't run away forever,
But there's nothing wrong with getting a good head start.
--- Jim Steinman, "Rock and Roll Dreams Come Through"
- 4
- XMPP Java bot loop questionI want to write a bot for XMPP (Jabber) in Java (1.6) using smack
libraries (http://www.igniterealtime.org).
I have already written a GUI client using smack, so I'm familiar with
how it works.
For the bot however, I'm in doubt about the main loop in combination
with event listeners. The bot basically just sits idly (until explicitly
stopped) listening for presence changes of contacts. The presence
changes are dealt with by a roster listener.
How would I wait for those events and have the application keep
executing? I am a bit clueless aobut threads in Java, but I have used
them in Delphi...
On a side note, if anyone can shed light on how to use the commons
daemon (http://commons.apache.org/daemon/), that would be useful later
on.
Many thanks in advance,
--
Sabine Dinis Blochberger
Op3racional
www.op3racional.eu
- 4
- How to download metafiles using a signed appletI want an applet which, once launched, downloads 3 metafiles (files
that it will need later on to work properly) and proceeds into a
processing phase only if the files have been successfully fetched.
So far I do not have a solution for requesting these files and writing
them locally.
Am I following the right track with URL and HttpURLConnection, or
should I be looking into packages like the Apache Jakarta project?
Is there possibly a more straightforward way to instruct the JRE to go
get file "http://www.foo.com/dist/localdata.dat" and put it at
location "C:\localdata.dat" ?
Is there possibly some correlation between the domain mentioned in my
signing certificate and the domain from which I download any
particular file?
Thanks for any ideas,
Brian Herbert Withun
- 5
- TextArea and imagesHi,
I am working on a chat applet, and I would like it to show an image
next to some text received from the server. I have looked everywhere I
can think of for a similar piece of code, but I haven't succeeded yet.
I use a TextArea for inserting the text received but I don't know how
to insert the image into the TextArea next to the text. Is there any
way to do this?
I also want some of the text and the image to be hyperlinked to other
web pages for loading upon cliking. I think I have found how to do
this, although I haven't tried it yet.
Any help specially with the first question will be appreciated.
Thank you
Miguel
- 5
- DER decoding from x.509 v3 certificateI need to read the extension field of a x.509 v3 certificate.
I use the java method getExtensionValue().
The method return an array of bytes DER-encoded.
I want to read it as a String and print it on screen. So I have to decode
the array and convert it.
I try a lot of way to do that but I never obtain good result.
Someone can help me?
Then, the DER encoding is equal to Base64 encoding or not?
Thanks
- 5
- executeQuery() doesn't time out, blocks indefinitely on network failureI am developing an application that must gracefully recover from
network failures, however I noticed that executeQuery() never returns
or throws an exception for a time out when the network goes down (which
I simulated by unplugging my ethernet cable). The TCP connections of
all my pooled database connections remain open and dead even after
plugging the cable back in. Calling queryTimeout() explicitly has no
effect--executeQuery() stays blocked on network IO forever. Is there a
way to time out executeQuery(), or some way to stop it from never
returning?
I'm using version 10.2.0.1.0 of Oracle's JDBC driver with the 1.5 JDK.
Code:
import java.util.*;
import java.sql.*;
import oracle.jdbc.pool.*;
public class Oracle
{
private OracleDataSource oracleDataSource;
public Oracle() throws Exception
{
oracleDataSource = new OracleDataSource();
oracleDataSource.setURL("jdbc:oracle:oci:@dev");
oracleDataSource.setUser("dbp");
oracleDataSource.setPassword("dbp");
oracleDataSource.setConnectionCachingEnabled(true);
}
public void validate()
{
Connection c = null;
Statement s = null;
ResultSet r = null;
try
{
System.err.printf("connecting...\n");
c = oracleDataSource.getConnection();
System.err.printf("connected\n");
s = c.createStatement();
s.setQueryTimeout(1);
for (;;) {
System.err.printf("executing...\n");
r = s.executeQuery("select 1 from dual");
System.err.printf("executed\n");
r.close();
try { Thread.sleep(1000); } catch (Exception e)
{ }
}
}
catch (Exception e)
{
e.printStackTrace();
try { r.close(); } catch (Exception ee) { }
try { s.close(); } catch (Exception ee) { }
try { c.close(); } catch (Exception ee) { }
}
}
public static void main(String[] args)
{
Oracle oracle = null;
try
{
oracle = new Oracle();
oracle.validate();
}
catch (Exception e)
{
e.printStackTrace();
System.exit(1);
}
}
}
Output:
> javac -cp ./ojdbc.jar Oracle.java && java -cp .:./ojdbc.jar Oracle
connecting...
connected
executing...
executed
(ethernet cable unplugged...)
executing...
(i waited a very long time, and nothing happened...)
- 5
- SinotticoDovrei sviluppare un sinottico in java qualche idea non so da dove partire
Grazie
- 6
- RTF parser componentHi all.
i want component which is sperating text frm rtf text.rtf text contains
images and some embedded objects which i want to seperate.
Does anyone know it.
Please help me.
- 9
- Reporting tool to be used with swingHello All,
I'm looking for a report generation tool to be used in a swing project
I'm working. The resports will involve very complex charts and graphs.
Kindly suggest tools which will meet these requirements.
Thanks and Regards
Chanchal
- 11
- efficient way to replace char in StringBufferI normally use strings. Just starting to use StringBuffer.
How can I do the following better? (Replace <cr> and <lf>
with <space>)
String s = DynamicPanel.dynamicCmdArea.getText(0, len);
StringBuffer ss = new StringBuffer(s);
int j = -1;
while ((j = ss.indexOf("\n")) != -1)
ss.setCharAt(j, ' ');
while ((j = ss.indexOf("\r")) != -1)
ss.setCharAt(j, ' ');
- 12
- Treasure Trooper what you do here is you complete simple surveys and offers, some
require a credit card, but i just do all the free ones :D
its easy to do, you just register and do the offers, then click the
"done" button when you have completed it to what the instructions say,
here is the website if you want to check it out
www.treasuretrooper.com/111524 (copy and paste into browser
this is how the payment works: say in june you made 60$, then on the
15th of next month, so on july 15th you would get your money. they send
a check in the mail so yes, you have to provide your correct address,
not a fake one (dont worry they dont spam you with shit) and you will
get a check in the mail from them and you can cash it like any other
check.
so far, i have been doing this thing for 2 months and i have been payed
$156.50 total. its easy money and only takes about half an hour a day
if your really keen on it, but usually 10 minutes is fine. on their
forums i ha ve heard that people are making like $200+ i hope i can get
that much in the future. im pretty close.
once again, if you are interested in signing up, here is where you go:
www.treasuretrooper.com/111524 (copy and paste into your browser)
- 12
- M'I`5'Persecu tion ' how an d w hy di d it s tart?-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
-= how and why did it start?. -=
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
The harassment didn't. start by itself, so someone must have been there at
the outset to give it a firm push and set the. "animals" after me. It looks
as if I was set up in June 1990, and the timing indicates. someone from
university was. responsible.
>One thing which has. been missing from this discussion is this simple
>prognosis: that. maybe he is right and that, despite his admitted
>mental condition, there really is a campaign against him. organised by
>now-influential ex-students. of his university.
In May or June 1990, Alan Freeman. on Radio 1 read out a letter from someone
who had known me for a few years, who wrote of the. one who "wore out his
welcome with random precision" (from the Pink. Floyd song). Freeman went on
to say to the writer "that's a hell of a. letter you wrote there". The
indication is strongly. that people I had parted from soon before nursed a
grudge against me and were trying. to cause trouble for me.
The suggestion is that Freeman might have shown the. letter to other people,
and things. could have snowballed from there. Right from the start the real
source (security services. presumed) didn't announce themselves as the
origin, but let the. "talkers", the radio DJs, believe that they were the
originators.. Think about it; if you announce, "we're MI5 and we have a
campaign against. this bloke" then people might not go along with it; but if
you say, "everyone. else is getting at this bloke because he 'deserves' it"
then people will join in with. fewer qualms.
>Why would "they" wish to assassinate. your character?
It's the. classic case of hitting a cripple to prove you're stronger. Why
would the security services expend hundreds of thousands of. pounds and more
than six years of. manpower to try to kill a British citizen? Because they
are motivated by people who knew. me at university and feel personal
animosity; because they. knew me to be emotionally weak, and it is in the
nature of bullies to prey on those. known to be weak; and because they can
rely on the complicity of the establishment, which the security. services
manipulate and derive funding. from. This is England's biggest humiliation
today, and the British security services. are intent on preventing their
humiliation becoming reality. by continuing their campaign of attempted
murder to suppress. the truth from becoming public.
1032
- 12
- How to use an unsigned number in Java?People, is there a library that allow me to use unsigned numbers? I need
this to implement a protocol but I don't want to have to keep masking a
long number.
- 13
- Project confusionOkay I'm not exactly sure what I'm supposed to do. I know I should
create a file that creates an abstract tree but I can't figure out
exactly what the other programs do and how I should use them to
implement an abstract tree. So if someone could please shed some light
as to what direction I should be going in it would be a lot of help.
The website as to where the assignment is located is as follows:
http://www.cs.uiowa.edu/~slonnegr/plc/. The pdf that describes the
homework is under the link Parse Homework under the Homework header.
Agains thanks for the help.
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| Author |
Message |
Cynthia Campbell
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 Posted: 2004-11-9 11:31:00 |
Top |
java-programmer, basic question on Java in XP
Hello,
can someone please tell me how to ascertain what version (if any) of Java is
installed in a WinXP platform?
my friend needs some kind of Java module installed so that she can do a
tutorial for an online registration service.
any help would be appreciated.
Cynthia
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Ivan Gotcha
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| Posted: 2004-11-9 12:18:00 |
Top |
java-programmer >> basic question on Java in XP
Open a Command Prompt window and type "java -version"
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Steve Sobol
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| Posted: 2004-11-9 12:21:00 |
Top |
java-programmer >> basic question on Java in XP
Ivan Gotcha wrote:
> Open a Command Prompt window and type "java -version"
There's a system property that'll work too if you need to check it from within
an app.
It's no different from Java running on other platforms.
--
JustThe.net Internet & New Media Services, http://JustThe.net/
Steven J. Sobol, Geek In Charge / 888.480.4NET (4638) / email***@***.com
PGP Key available from your friendly local key server (0xE3AE35ED)
Apple Valley, California Nothing scares me anymore. I have three kids.
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Andrew Thompson
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| Posted: 2004-11-9 13:11:00 |
Top |
java-programmer >> basic question on Java in XP
On Tue, 09 Nov 2004 03:30:45 GMT, Cynthia Campbell wrote:
> can someone please tell me how to ascertain what version (if any) of Java is
> installed in a WinXP platform?
Browser or desktop? (This is an important distinction, since
they are not necessarily the same.)
You can find out which Java (if any) a browser is using by
pointing it here.
<http://www.physci.org/pc/property.jsp?prop=java.version>
OTOH, there is a link to download the 'application' version of that
program (JTest - at the top of the page) that will show that property
(as well as others) for the destop.
But let's clarify browser/desktop first.
--
Andrew Thompson
http://www.PhySci.org/codes/ Web & IT Help
http://www.PhySci.org/ Open-source software suite
http://www.1point1C.org/ Science & Technology
http://www.LensEscapes.com/ Images that escape the mundane
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Cynthia Campbell
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| Posted: 2004-11-9 14:55:00 |
Top |
java-programmer >> basic question on Java in XP
Andrew: good point - my friend needs a version of Java installed to enable
certain functions in a browser - is this different than the "runtime Java"
from sun systems?
thanks...
"Andrew Thompson" <email***@***.com> wrote in message
news:email***@***.com...
> On Tue, 09 Nov 2004 03:30:45 GMT, Cynthia Campbell wrote:
>
> > can someone please tell me how to ascertain what version (if any) of
Java is
> > installed in a WinXP platform?
>
> Browser or desktop? (This is an important distinction, since
> they are not necessarily the same.)
>
> You can find out which Java (if any) a browser is using by
> pointing it here.
> <http://www.physci.org/pc/property.jsp?prop=java.version>
>
> OTOH, there is a link to download the 'application' version of that
> program (JTest - at the top of the page) that will show that property
> (as well as others) for the destop.
>
> But let's clarify browser/desktop first.
>
>
> --
> Andrew Thompson
> http://www.PhySci.org/codes/ Web & IT Help
> http://www.PhySci.org/ Open-source software suite
> http://www.1point1C.org/ Science & Technology
> http://www.LensEscapes.com/ Images that escape the mundane
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Andrew Thompson
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| Posted: 2004-11-9 15:43:00 |
Top |
java-programmer >> basic question on Java in XP
On Tue, 09 Nov 2004 06:55:18 GMT, Cynthia Campbell wrote:
See responses below..
> "Andrew Thompson" <email***@***.com> wrote in message
> news:email***@***.com...
>> On Tue, 09 Nov 2004 03:30:45 GMT, Cynthia Campbell wrote:
>>
>>> can someone please tell me how to ascertain what version (if any) of
> Java is
>>> installed in a WinXP platform?
>>
>> Browser or desktop? (This is an important distinction, since
>> they are not necessarily the same.)
> Andrew: good point - my friend needs a version of Java installed to enable
> certain functions in a browser
Internet Explorer (by any chance)?
..
>> You can find out which Java (if any) a browser is using by
>> pointing it here.
>> <http://www.physci.org/pc/property.jsp?prop=java.version>
Get your friend to visit this link. If it says '1.1.4',
that will (probably) be the problem.
> ...is this different than the "runtime Java"
> from sun systems?
Possibly, especially if the browser is Internet Explorer, or very old.
Your friend *should* upgrade the browser to Sun Java if it is *not*
using it. While there are other good manufacurers of the Java plug-in,
there are also some bad ones, and it is best (for average end users)
to stick with the one made by Sun.
OTOH, perhpas I should have a closer look at this
"..tutorial for an online registration service.".
What is the URL?
[ If they have been smart, it will work with Java 1.1 +,
and the problem *might* be something other than what I
am guessing (IE missing modern Java) ].
--
Andrew Thompson
http://www.PhySci.org/codes/ Web & IT Help
http://www.PhySci.org/ Open-source software suite
http://www.1point1C.org/ Science & Technology
http://www.LensEscapes.com/ Images that escape the mundane
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Cynthia Campbell
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| Posted: 2004-11-9 16:47:00 |
Top |
java-programmer >> basic question on Java in XP
"Andrew Thompson" <email***@***.com> wrote in message
news:fewghr8b588h$.jpqu3wtugwwn$email***@***.com...
> On Tue, 09 Nov 2004 06:55:18 GMT, Cynthia Campbell wrote:
>
> See responses below..
>
> > "Andrew Thompson" <email***@***.com> wrote in message
> > news:email***@***.com...
> >> On Tue, 09 Nov 2004 03:30:45 GMT, Cynthia Campbell wrote:
> >>> can someone please tell me how to ascertain what version (if any) of
> > Java is installed in a WinXP platform? Browser or desktop? (This is an
important distinction, since
> >> they are not necessarily the same.)
>
> > Andrew: good point - my friend needs a version of Java installed to
enable
> > certain functions in a browser
>
> Internet Explorer (by any chance)?
> ..
> >> You can find out which Java (if any) a browser is using by
> >> pointing it here.
> >> <http://www.physci.org/pc/property.jsp?prop=java.version>
> Get your friend to visit this link. If it says '1.1.4', that will
(probably) be the problem.
>
> > ...is this different than the "runtime Java" from sun systems?
>
> Possibly, especially if the browser is Internet Explorer, or very old.
Your friend *should* upgrade the browser to Sun Java if it is *not* using
it. While there are other good manufacurers of the Java plug-in, there are
also some bad ones, and it is best (for average end users) to stick with
the one made by Sun.
>
> OTOH, perhpas I should have a closer look at this "..tutorial for an
online registration service.".What is the URL?
Hello Andrew:
Thanks for the pointers.
When I visit the link above with IE6, it shows nothing. When I visit with
Mozilla Firefox, it says, "Java Version 1.4.2_05." I'm slowly getting the
picture here. M$ seems to have dropped its support for it's "java VM"
environment; therefore, I suppose if my friend wants to do her online
tutorial, she'll need to use a Mozilla-based browser. I did recently
install the latest Sun java runtime on her system (therefore the version
readout above); it's just that I assumed somehow that Sun java would install
its own plugin in IE6.
The registration service is called "regonline"; they don't say much about
their tutorials on their site.
Cynthia
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Andrew Thompson
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| Posted: 2004-11-9 17:13:00 |
Top |
java-programmer >> basic question on Java in XP
On Tue, 09 Nov 2004 08:46:55 GMT, Cynthia Campbell wrote:
> "Andrew Thompson" <email***@***.com> wrote in message
> news:fewghr8b588h$.jpqu3wtugwwn$email***@***.com...
...
>>>> You can find out which Java (if any) a browser is using by
>>>> pointing it here.
>>>> <http://www.physci.org/pc/property.jsp?prop=java.version>
..
> When I visit the link above with IE6, it shows nothing.
It should NEVER show NOTHING, Cynthia.
It might display
"This page requires 'Java enabled'. Please consult
your browser settings or system administrator."
Or.. "This applet requires the free Java Plug-In."
Which is it?
>>> ...is this different than the "runtime Java" from sun systems?
>>
>> Possibly, especially if the browser is Internet Explorer, or very old.
> ....M$ seems to have dropped its support for it's "java VM"
> environment;
Yes. Now MS supply IE with no Java.
(A lot of browser makers offer 'Java'/'No Java' options)
The user can install Java if they want.
>..therefore, I suppose if my friend wants to do her online
> tutorial, she'll need to use a Mozilla-based browser.
She can install it for IE's use, or *configure IE* as apporpriate.
But, listen closely.
I am not sure what the problem is yet, and before we go getting
carried away, I want to see this applet for myself.
>> OTOH, perhpas I should have a closer look at this "..tutorial for an
>> online registration service.".What is the URL?
..
> The registration service is called "regonline";
This one? <http://www.regonline.com/>
>..they don't say much about
> their tutorials on their site.
I could not see any applets at all. Can you copy/paste the
URL (web address) you visit to see this page?
--
Andrew Thompson
http://www.PhySci.org/codes/ Web & IT Help
http://www.PhySci.org/ Open-source software suite
http://www.1point1C.org/ Science & Technology
http://www.LensEscapes.com/ Images that escape the mundane
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Cynthia Campbell
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| Posted: 2004-11-10 9:06:00 |
Top |
java-programmer >> basic question on Java in XP
Hi Andrew,
Thanks for your comments. Re, your last comment, I re-affirm that IE6 shows
NOTHING (except a large blank square with a tiny square red "x" in the upper
left - IE's "can't load graphic" icon..) When I use FireFox, I get a
drop-down select, then below a grey square with the info chosen in the
drop-down visible.
I even went into IE6 tools/options and ENABLED all the Java options in
advanced (Java Sun, Java console, Java logging and Java compiler). I then
re-booted the whole system, but the web-link still gave the
"empty/no-graphic" icon described above.
As far as the "regonline" tutorial, I'll have to check with their tech
support to see what they require. Nonetheless, I would like to get IE6
Java-friendly if possible.
Cynthia
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Andrew Thompson
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| Posted: 2004-11-10 15:06:00 |
Top |
java-programmer >> basic question on Java in XP
On Wed, 10 Nov 2004 01:05:46 GMT, Cynthia Campbell wrote:
> Thanks for your comments. Re, your last comment, I re-affirm that IE6 shows
> NOTHING (except a large blank square with a tiny square red "x" in the upper
> left - IE's "can't load graphic" icon..) When I use FireFox, I get a
> drop-down select, then below a grey square with the info chosen in the
> drop-down visible.
That is a warning sign that my earlier guesses were *WRONG*.
There is another thing that might have happened to IE.
Let's test it..
<http://www.physci.org/test/appletcall/index5.html>
This page was designed for something else, but it might
tell me something important. What are the (any) word or
words before "Above is defined an applet call in two
forms, an..."
Are there *any* words *above* that sentence? What are they?
> I even went into IE6 tools/options and ENABLED all the Java options in
> advanced (Java Sun, Java console, Java logging and Java compiler).
Good. I was about to ask you to go into IE options, but it
seems you're already ahead of me there. We might come back to
those, but it's good to know you are familiar with them.
(snip)
> As far as the "regonline" tutorial, I'll have to check with their tech
> support to see what they require.
If you could. I always forget to add "..and don't forget to
ask the people who supply this Applet!"
>..Nonetheless, I would like to get IE6
> Java-friendly if possible.
OK, that answers a question I was about to ask you.
(Are you prepared to simply dump IE and use a different browser?
..Good to see you are not giving in so easily! )
--
Andrew Thompson
http://www.PhySci.org/codes/ Web & IT Help
http://www.PhySci.org/ Open-source software suite
http://www.1point1C.org/ Science & Technology
http://www.LensEscapes.com/ Images that escape the mundane
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Index ‹ java-programmer |
- Next
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- Help with JavaPOS pleaseHi there,
I have made an application that uses a POS printer device to print out a
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but there are genereal problems printing out .....
sometimes it prints out sometimes it doesn't (??) this is not the most major
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After I have opened my device, claimed it everything should be ready or ??
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- 4
- Making a soundcard objectI have this idea of making a modem, that requires the soundcard to act
as my A/D and D/A, and in the middle will be my attempts at DSP. I
came up with this object, and it seems to test OK, but I could use
some constructive criticism, as I am definately at the OO 101 stage.
Merry Christmas, and a Happy New Years soon!
/**
* SoundCard.java
*
* @version 1.0, 1 December 2007
* @author Steve Sampson, K5OKC
*
* Public Domain (p) December 2007
*/
package modem;
import javax.sound.sampled.*;
import java.io.*;
public class SoundCard {
private static AudioFormat format;
private static TargetDataLine targetLine;
private static SourceDataLine sourceLine;
private static AudioInputStream sound;
public void SoundCard() {
}
/*
* Initialize Sound Card
*/
public boolean initPCM(double dblSampleRate) {
/*
* Encoding,
* Sample Rate (float),
* Sample Size (In Bits),
* Channels,
* Frame Size,
* Frame Rate (float),
* BigEndian (Boolean)
*/
format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
(float)dblSampleRate,
16,
1,
2,
(float)dblSampleRate,
false);
DataLine.Info targetInfo = new
DataLine.Info(TargetDataLine.class, format);
DataLine.Info sourceInfo = new
DataLine.Info(SourceDataLine.class, format);
try {
/*
* A source data line is written to
*/
sourceLine =
(SourceDataLine)AudioSystem.getLine(sourceInfo);
sourceLine.open(format); // Typical buffer size is same
as samplerate in bytes
sourceLine.start();
/*
* A target data line is read from
*/
targetLine =
(TargetDataLine)AudioSystem.getLine(targetInfo);
targetLine.open(format); // Typical buffer size is same
as samplerate in bytes
targetLine.start();
}
catch (LineUnavailableException e1) {
return false;
}
catch (SecurityException e2) {
return false;
}
catch (IllegalArgumentException e3) {
return false;
}
catch (IllegalStateException e4) {
return false;
}
if(!AudioSystem.isLineSupported(targetInfo)) {
return false;
}
sound = new AudioInputStream(targetLine);
return true;
}
/*
* Stop, flush, and close the soundcard interface
*/
public void closePCM() {
sourceLine.stop();
targetLine.stop();
sourceLine.flush();
targetLine.flush();
try {
sourceLine.close();
targetLine.close();
}
catch (SecurityException e)
{
}
}
/*
* Provide a block of Signed 16 bit PCM sound data
*/
public int getPCM(int[] intSampleArray) {
int intBytesRead;
byte[] byteData = new byte[intSampleArray.length * 2]; //
Convert count to bytes
/*
* Read bytes into array. This call will block if there aren't
* enough requested bytes.
*/
try {
intBytesRead = sound.read(byteData, 0, byteData.length);
} catch(IOException e) {
return -1;
}
/*
* This is designed for Little-Endian Intel machines
*/
for (int i = 0, j = 0; i < intBytesRead; i += 2, j++)
intSampleArray[j] = (byteData[i + 1] << 8) + byteData[i];
return intBytesRead / 2; // convert count to words
}
}
- 5
- Help sought trying to add java to mozilla 1.5
I've downloaded and gotten mozilla 1.5 to work on my desktop machine.
However, when I visit Java enabled sites, I get a popup that tells
me I am missing the plugin for the java-vm applet type. When I say
"download it", the only links are for windows and linux, and I'm
not using either of these.
In the java 1.4.2_01 directory I have on my machine is a rje/plugin/sparc/ns610
directory in which there is a .so file. But I don't see any instructions
on what all I need to connect things together.
When I try to copy that .so file into my $HOME/.mozilla/plugins directory,
mozilla 1.5 crashes attempting to access the java applets. If I
remove the .so, then I get a popup telling me I need a plugin.
Can anyone provide additional ideas on what might be missing?
--
<URL: http://wiki.tcl.tk/ > In God we trust.
Even if explicitly stated to the contrary, nothing in this posting
should be construed as representing my employer's opinions.
<URL: mailto:email***@***.com > <URL: http://www.purl.org/NET/lvirden/ >
- 6
- Java Newbie Question: Character Sets, Unicode, et al [Long]Roedy Green wrote:
> Ve need some definitions that make clear the distinction between:
> an character set,
> a character
> a glyph
> a font
> an encoding.
I'll take a stab at it.
I decided to see what Unicode had to say on the matter. That seemed
relevant, but may have been a mistake. In any event, here are some
possibly relevant defintions from the Unicode 4.0 glossary
(http://www.unicode.org/glossary/):
==== From the Unicode 4.0 Glossary ====
Abstract Character. A unit of information used for the organization,
control, or representation of textual data. (See Definition D3 in
Section 3.3, Characters and Coded Representations .)
Character. (1) The smallest component of written language that has
semantic value; refers to the abstract meaning and/or shape, rather than
a specific shape (see also glyph), though in code tables some form of
visual representation is essential for the reader's understanding. (2)
Synonym for abstract character. (See Definition D3 in Section 3.3,
Characters and Coded Representations .) (3) The basic unit of encoding
for the Unicode character encoding. (4) The English name for the
ideographic written elements of Chinese origin. (See ideograph (2).)
Character Encoding Form. Mapping from a character set definition to the
actual code units used to represent the data.
Character Encoding Scheme. A character encoding form plus byte
serialization. There are seven character encoding schemes in Unicode:
UTF-8, UTF-16, UTF-16BE, UTF-16LE, UTF-32, UTF-32BE and UTF-32LE.
Character Set. A collection of elements used to represent textual
information.
Coded Character Set. A character set in which each character is assigned
a numeric code point. Frequently abbreviated as character set, charset,
or code set.
Code Point. (1) A numerical index (or position) in an encoding table
used for encoding characters. (2) Synonym for Unicode scalar value.
Code Unit. The minimal bit combination that can represent a unit of
encoded text for processing or interchange. (See Definition D5 in
Section 3.3, Characters and Coded Representations .)
Encoded Character. An abstract character together with its associated
Unicode scalar value (code point). By itself, an abstract character has
no numerical value, but the process of "encoding a character" associates
a particular Unicode scalar value with a particular abstract character,
thereby resulting in an "encoded character."
Encoding Form. (See character encoding form.)
Encoding Scheme. (See character encoding scheme.)
Font. A collection of glyphs used for the visual depiction of character
data. A font is often associated with a set of parameters (for example,
size, posture, weight, and serifness), which, when set to particular
values, generate a collection of imagable glyphs.
Glyph. (1) An abstract form that represents one or more glyph images.
(2) A synonym for glyph image. In displaying Unicode character data, one
or more glyphs may be selected to depict a particular character. These
glyphs are selected by a rendering engine during composition and layout
processing. (See also character.)
Glyph Image. The actual, concrete image of a glyph representation having
been rasterized or otherwise imaged onto some display surface.
==== End of Glossary Excerpt ====
Note: the glossary does not contain a definition of "character
encoding", but it seems to be used in the Unicode context as an
abbreviation for "character encoding form" (_not_ "character encoding
scheme").
The Java documentation is a bit confused and inconsistent in its
terminology with respect to characters, character sets, and character
encodings. For instance "the Java platform uses Unicode as its native
character encoding" (i18n docs), but at the same time UTF-8 and UTF-16
are referred to as "character encodings" that all Java implementations
must support. Elsewhere in the docs these are the names of "charsets",
which is to say that in some places the docs call them "encodings" and
in others "charsets." Moreover, in Java 1.4 there is now
java.nio.charset.Charset, "A named mapping between sequences of
sixteen-bit Unicode characters and sequences of bytes." This is
consistent with MIME, but different from Unicode usage (which would call
such a thing a "character encoding scheme", except that it also implies
a certain collection of characters to which it can apply).
RFC 2045 (MIME) says, in part:
NOTE: The term "character set" was originally to describe such
straightforward schemes as US-ASCII and ISO-8859-1 which have a
simple one-to-one mapping from single octets to single characters.
Multi-octet coded character sets and switching techniques make the
situation more complex. For example, some communities use the term
"character encoding" for what MIME calls a "character set", while
using the phrase "coded character set" to denote an abstract mapping
from integers (not octets) to characters.
That describes terminology similar to Unicode's current terminology, but
not exactly the same.
Java documentation has also changed over the years with regard to how it
names these things.
What a muddle.
As this is a Java newsgroup, we are stuck with the inconsistencies of
the Java documentation, at least to some extent. We are also stuck with
the ambiguity of some of our terms (note, for instance, the four (four!)
different definitions of "character" above -- I find that I personally
use the word in each of those ways). On the other hand, there seem to
be some points on which there is little disagreement (at least in
official douments) such as a "font" as a collection of glyphs, a "glyph"
as a depiction of a character, and a definite distinction between glyphs
and characters (whatever those are).
Luckilly, in a Java context there is little call for usage of the term
"character set" in the Unicode sense, so it seems reasonable and
appropriate that in this venue we should use it in the MIME / Java NIO
sense (as defined by java.nio.charset.Charset.) "Charset" is a synonym.
By an "encoding" or "character encoding", I think we generally mean what
Unicode calls a "character encoding scheme" with the implicit
recognition that in a Java context the "character encoding form" is the
one defined by Unicode. This is closely related to a "charset" as
defined in the previous paragraph.
That leaves only "character" of the five terms of interest, and I don't
think I can do much better than the Unicode glossary there, except to
note the existence of class java.lang.Character, a related but distinct
entity. A character is definitely distinct from a glyph -- the latter
is a possible representation (or part of one) of the former, for some of
the defintions of the former.
John Bollinger
email***@***.com
- 7
- writing java daemon server: start and stopDear everyone,
I am trying to write a server program to do some monitoring.
I am using Windows 2000 platform.
I've seen that there is some server program can start server by
specifying command like "server start" and stop it like "server stop".
I am wondering how to do it in java language since java is running in
the JVM.
1. Is it prossible to send signal to kill the process just like c lang
?
2. Do java have process ?
3. How about if java thread can be killed by those deprecated method
like thread.stop(), can I find the current running thread and stop it
?
4. Any suggested method to do the server stop which can stop the
current running java program in JVM ?
Thank you for helping
Calvin
- 8
- 9?. Steps To Improve Your FlyingThere are many things that you can do when you fly to make yourself a
safer and better pilot. Too many pilots get careless and stop doing
fundamental things that could save their lives. Here are some simple
things that you can do to improve your flying.
1. Use your rudder pedals.
It seems simple, right? Well, too many people neglect to get in the
good habit of using them. Use them during taxi, takeoff, climbs,
cruise, maneuvers, descents, and landing. Get the picture - Use them
all the time.
You can know exactly how much to use them during flight by looking at
the slip/skid indicator. That is the ball of the turn coordinator. As
long as the ball is centered between the lines, you are using the
right amount of rudder. If the ball is outside the lines, add rudder
in the direction that the ball is located.
For instance, if the ball is to the right, add right rudder. An easy
way to remember this is to "Step on the ball." Add enough pressure to
re-center the ball.
There are a lot of things happening when you are airborne. Correctly
using your rudder will make you a better pilot, keep your passengers
happy, and show your piloting professionalism (something you need to
have, even if you are not a professional pilot). Remember, step on the
ball.
2. Use Your Checklist
As you are flying, make sure that you use your checklist for each
portion of the flight. There are checklists for everything from
preflight to securing the airplane. Most airplanes have a checklist in
the owner's manual that you can use during your flights. Also, when
you learn to fly most flight schools have checklists that are
available for their students.
But checklists aren't put there to look pretty. Your job is to use
them. If you get in the habit of using one each flight, you will be
that much safer. It's not going to do you any good in your flight bag.
Even if you know the items by heart, still double check yourself
anyway.
Another thing, if you need to add something personal to your checklist
(like don't forget your sunglasses, or turn off your cell phone so the
battery won't run down as it searches for a signal in flight) do this
as well. As long as you have all the required items included, add any
that will help you personally during your flight.
3. G.U.M.P.S.
Whether you use G.U.M.P.S. as your landing checklist or not, get in
the habit of using a memorized checklist for your return to earth. In
a complex airplane, Gumps is; Gas, Undercarriage, Mixture, Propeller,
and Seatbelts. In a non-complex airplane, Gumps could be; Gas,
Undercarriage, Mixture, Power, and Seatbelts. Of course you don't
actually have to lower your gear on a fixed gear plane, but it is best
to remind yourself anyway. That way, when you do transfer to a
retractable gear airplane, you won't have to add anything to your
checklist. This also happens to be one of the most important checklist
items of the whole flight. So you will already be in the habit of
checking your landing gear when you get to the point where it really
matters.
4. Weight and Balance
Never ever forget to precisely calculate your weight and balance for
each flight. Too many people have gotten lazy and careless, and have
added extra weight in the form of passengers or cargo to their
airplanes, thinking that everything is ok. Isn't there room for error
- a little safety cushion, if you will - in the maximum useful load?
Why would you even want to know? If you take this attitude with your
flying, you are putting yourself and your passengers in a very
dangerous situation. Never operate out of the manufacturer's set
limitations for your airplane. They are there for a reason; to keep
you safe!
5. T.O.L.D.
Takeoff and Landing Data should be calculated for every flight as
well. Make sure that you are very familiar with all of the runways of
intended use and their lengths and widths. If it is not something that
you or your airplane can handle, don't make the flight. Don't get in
the habit of assuming that just because you are in a Cessna 172 that
every landing strip is suitable for your flight. Calculate your
takeoff and landing distances for each flight, taking into
consideration the density altitude and aircraft performance.
6. Appropriate Radio Calls
One flying safety item that can easily be performed is making sure
that you make your radio calls at the appropriate time. Whether you
are flying out of a towered or uncontrolled airport, be professional
with your radio calls. One common error is made at uncontrolled
airports, when after an airplane lands, the pilot calls clear of the
runway while part or all of the airplane is on the runway side of the
hold short line. This is dangerous! What if your airplane malfunctions
and you are stuck on the runway and another airplane thinks it's safe
to land? This is a hazardous situation that can easily be avoided. At
non-towered airports, it's better to not make any radio call at all,
than to make a dangerous one. Get it right!
7. Complete Runup
You have done a complete preflight inspection and are now ready to
takeoff. Make sure you do a complete engine runup as well. Check every
aircraft system while you are still on the ground before you get in
the air. Determine that all of your radios, comm and nav are
functioning. Check your vacuum and electric gyros. Check your flight
controls and your engine gauges. Know that when you take off, you are
as safe as you can be. There is no reason to rush through your runup.
8. Situational Awareness
Situational awareness is when you know exactly what is happening with
your flight and with what is going on around you. On the ground, you
need to make sure that you are aware of other airplanes that are
taxiing and using the runway. In the air, use the radio and your eyes
to know exactly where other airplanes are in relation to you as well
as their intentions. But situational awareness is not just limited to
knowing where other airplanes are. You also need to know exactly what
is happening with your airplane, the weather, airspace, the winds,
your location, what you would do in an emergency, etc. Regardless of
whether you are flying cross country or local, for fun or for
training, don't assume everything is alright. Know what is happening
around you.
9. Fly the plane from engine start to shutdown
When it comes to flying, make sure that you are maintaining vigilance
at all times in the airplane. Too many times pilots zone out at some
point in the flight. For many pilots, that time is before takeoff and
after landing. Make sure that even when you are on the ground, you are
flying the airplane. Keep a watchful eye out for other aircraft and
don't rely on the tower to separate ground traffic. Position your
flight controls so that you have the proper crosswind correction,
regardless of the wind speed. Even if the wind is calm, look at the
wind sock and taxi as if the wind is really blowing in the direction
indicated by the sock. Although you are on the ground, your control
surfaces are still somewhat effective. Treat them as if your safety
depends on their position.
9?. Have Fun
Even though it sounds simple, keep your flying fun. When you are in
the air, you are living a dream. Don't forget it!
http://cncarrental.cn/html/goodspeech/20060924/633.html
- 9
- 10
- odd mouselistener issueHi Guys
I'm probably doing something stupid... but:
I've got a JFrame with borderlayout. In the centre box, I've got a
JPanel. If I add a mouselistener to the jframe, it works fine (but
I've got coords relative to the frame which is correct but not what I
want - I want coords relative to the panel). However, when I add the
mouselistener to the panel, I get no mouseevents being returned at all.
Any ideas in what way I might be being stupid?
TIA
Peter.
- 11
- arrays of generic typesEclipse tells me that arrays of generic types are not legal, e.g.: it
won't allow the following:
QuadTree<MyNodeType> [] allQuadTrees;
Anyone know why this is the case?
- 12
- Socializing site EXCLUSIVELY for TECHIESTechnopax.com, (http://www.technopax.com) the first socializing web
portal exclusively catering to the IT Professionals world over is
launched.
This web portal will be a common online platform for IT industry
related professionals. Technopax.com primarily targets computer
software and hardware professionals, networking & system
administrators, nano Technologists, bio-technologists, graphics &
animation designers, BPO/Call Center/ITES employees, telecom experts,
employees of IT Departments of all business organizations and
technology students etc as its members.
According to the promoters, an online platform exclusively for Techies
will improve their technical and professional skills through the
sharing of knowledge base, methodologies and skill sets. Apart from
building vast friends circle, this will also help them to be abreast
with the latest developments that happen in the tech front world over.
Technopax.com has many features for the members to collaborate and
socialize. It has text/audio and video chat, online clubs, events,
forums, classified advertisements, discussion rooms, music and video
sharing, web profiles etc. Please verify.
- 13
- Beans with JSFI'm pretty new to programming with JSF and beans, and have been
reading up the documentation in the book "Core JavaServer Faces"
by D.Geary and C. Horstmann as well as online, and managed to
get some simple programs to run, so at least I now understand
some of the basics.
However, I've got quite a lot of existing code in HTML and
JavaScript that works, although not fully cleaned up yet, and I want
to make as few changes as possible in order to modify it for using
beans with JSF. Specifically, some months ago I wrote some
client-side code which is backed up online at
http://csharp.com/simulator/simulator.html, which I'm in the process
of modifying for JSF. The links at the bottom take you to
.../option1.html and .../option2.html, with the original source code
at
respectively .../option1.txt and .../option2.txt. At the moment the
code is not linked to code on a server, so only the JavaScript works
with the forms.
The index page didn't need much work, with the main change being
to include the JSF tags at the top (I'm leaving work on the counter
until later). The option1 page is mostly one large form, and what I
have since done is to keep the form as it is, except that it only
operates with JavaScript, with the post, action, and JavaScript
function calls at the beginning removed, together with the "Submit"
and "Reset" buttons at the end. I put these two buttons together
with calls to the JavaScript in a JSF form immediately below the
end of original form, and after making a few changes to the
JavaScript, got the JavaScript to work correctly and validate the
form.
My question is how do I send to the server the contents of the
original form, including the hidden fields? Do I have to create a
hidden field in the JSF form for each value entered in the main form,
and create a bean for each of these values, or is there some way
of sending the whole contents of the form to a bean, which can then
parse the values. I want to avoid turning the original form into a
JSF form, as it would probably mean making many changes to the
JavaScript, which would require extra work and debugging.
Exactly the same will be done with the option2 page once option1
has been sorted out, and I would be most grateful for some advice.
Christopher Sharp
- 14
- Arrays - component type vs Element typeCan anyone explain to me the difference between an element type and a
component type?
In the java literature, arrays are said to have component types, whereas
collections from the Collections Framework are said to have an element
type.
http://java.sun.com/docs/books/jls/second_edition/html/arrays.doc.html
states:
> The *component type* of an array may itself be an array type. The components of
> such an array may contain references to subarrays. If, starting from any
> array type, one considers its component type, and then (if that is also an
> array type) the component type of that type, and so on, eventually one must
> reach a component type that is not an array type; this is called the *element
> type* of the original array, and the components at this level of the data
> structure are called the elements of the original array.
Reading that - I thought I'd 'got' the difference, but then in 10.1 (a
para later) the terms seem to used synonomously!
> An array type is written as the name of an *element type* followed by some
> number of empty pairs of square brackets []. The number of bracket pairs
> indicates the depth of array nesting. An array's length is not part of its
> type.
> The element type of an array may be any type, whether primitive or reference.
> In particular:
>
> € Arrays with an interface type as the *component type* are allowed. The
> elements of such an array may have as their value a null reference or
> instances of any type that implements the interface.
> € Arrays with an abstract class type as the *component type* are allowed.
> The elements of such an array may have as their value a null reference or
> instances of any subclass of the abstract class that is not itself
> abstract.
When describing collections from the Collections framework there is
never any of this ambiguity/distinction - it is always "element type",
even when talking about a collection whose elements are themselves
collections.
Am I missing a "big idea"?
Any thoughts greatly appreciated.
Rob
email***@***.com
- 15
- Can I restrict permissions at runtime?I have an editor application that I've writen that needs to read and
write XML files to disk. I'd like to extend this program by allowing
users to extend my editor by plugging in custom code they compile using
certain interfaces. My editor will call their code to gain use of
their functions.
However, this plugin code is untrusted, and I don't want it to access
the filesystem or network. Is there some way I can create a sandbox
within my program in which I can run this custom code and be sure that
it cannot do things like write to the filesystem? Perhaps create a
separate thread with special restricted permissions?
Mark McKay
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