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Index ‹ java-programmer
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- 2
- Tired of 100s of stupid Getter/Setter methodsTor Iver Wilhelmsen wrote:
> Dave Glasser <email***@***.com> writes:
>
> > Java does not. Methods can be overridden with less restrictive access
> > (like the common practice of overriding Object.clone() with a public
> > clone() method) but not more restrictive access.
>
> But they can be overridden with exception-throwing code to ensure
> they're not used.
Indeed. That's more of a symptom of a problem than a reasonable
solution. You're then left with a class that professes to follow an
interface, but doesn't follow it. What you really wanted was to
implement a different interface on top of existing functionality... a
task for which composition is ideal.
Of course, in a pinch, the exception-throwing kludge will work; it's
integrated into the collections API and even given a fancy name:
"optional methods". However, even its light application there is
generally acknowledged to be one of the few great failures of that API.
--
www.designacourse.com
The Easiest Way to Train Anyone... Anywhere.
Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation
- 2
- 3
- Making and Returning Java Byte Arrays in C++ via JNI (Help! Please!)How do you make java byte arrays, fill them with values, and return
them in c++? I have no clue where to start. The JNI Tutorial a at
Java's website isn't much help because it doesn't really explain how to
make new jarrays. Any tips, how-tos and example code are welcome! (And
can anybody please explain me what's jsize? Is it just another integer?)
- 3
- Executable binaryHello java experts:
Is there any tool to make java file into executable binary? thanks in
advance
- 7
- portaudit and linux-sun-jdk15>
X-XaM3-API-Version: 4.3 (R1) (B3pl17)
X-SenderIP: 82.49.197.26
I'm referring to the informations displayed on this page:
http://www.vuxml.org/freebsd/18e5428f-ae7c-11d9-837d-000e0c2e438a.html
Is the information about linux-sun-jdk15 correct?
1.5.* <= linux-sun-jdk <= 1.5.2.02,2
I think that the correct version should be 1.5.0.02,2 considering also that a 1.5 based version >=1.5.1 doesn't (yet) exist.
The last jdk versions for linux is 1.5.0.11 and the port with that version has been committed today, but portaudit is still complaining about this vulnerability.
Thank you.
P.S.
Sorry if I'm writing to too many people, but I'm not sure about who is responsible for that problem.
------------------------------------------------------
Passa a Infostrada. ADSL e Telefono senza limiti e senza canone Telecom
http://click.libero.it/infostrada25feb07
- 8
- Help choosing JSP ServerHello,
could you folks share with me your recomendations on what JSP servers are
available for a small
business with a very small budget, hopefully something that would produce
error message little
more descriptive than that of Tomcat and also with discent web-server
plugin capabilities and
administration interface.
Thanks in advance,
Ilya Bari.
- 9
- SQL into XMLHi All;
My SQL queries return one, two, sometimes even three levels of XML
data.
So for orders in my system I would like to see in my XML:
<RESULTS>
<order>
<number>3213</number>
<date>Feb 03, 2003</date>
<product>
<name>NEC Monitor</name>
<quantity>3</quantity>
<serial_numbers>
<sn>12321312321</sn>
<sn>44314133422</sn>
<sn>43434343553</sn>
<serial_numbers>
</product>
<product>
<name>Genius Mouse</name>
<quantity>2</quantity>
<serial_numbers>
<sn>23232</sn>
<sn>44343</sn>
<serial_numbers>
</product>
</order>
<order>
<number>444</number>
<date>Mar 06, 2003</date>
<product>
<name>MS Keyboard</name>
<quantity>1</quantity>
<serial_numbers>
<sn>333333</sn>
<serial_numbers>
</product>
</order>
........
</RESULTS>
obviously my query would reutrn
order_num order_date product_name quantity
serial_number
------------------------------------------------------------------------
3231 Feb 03, 2003 NEC Monitor 3 12321312321
3231 Feb 03, 2003 NEC Monitor 3 44314133422
3231 Feb 03, 2003 NEC Monitor 3 43434343553
3231 Feb 03, 2003 Genius Mouse 2 23232
3231 Feb 03, 2003 Genius Mouse 2 44343
444 Mar 06, 2003 MS Keyboard 1 333333
You get the point. I do not want to have 3 queries, but only one that
returns something like described above.
For now I have a functioin that does this, but the algorithm is not
the best, and it only works for two levels (so XML without the s/n for
example).
This must be a common problem, I would appriciate input as to how this
is commonly done, any pointers to web sites, articles... are all
welcome. I'd try to search the groups but for what?:) I would also
like to describe my current algorithm, but for now it seems I would
just bore you.
Looking for some input,
Damjan
- 14
- JOptionPane.showInputDialog on JButton[][] arraySorry i have a problem.
I don't know the java language but i must create a grid Of button witch
random Values, and when i clicked on one button i must change the internal
values.
I try ti make a code but i don't know how to pass the value of botton to
mouse event, and change it with
String input = JOptionPane.showInputDialog("Insert value:");
for a single button there aren't any problems, but how can I change the
value of an array of button witch MouseEvent?
Thx!!!! please help me!!!!
QUADRATOFRAME.CLASS
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Random;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
public class QuadratoFrame extends JFrame {
JButton pulsante = new JButton();
int N=6;
int MAXELEM = 50;
int[][] mat=new int[N][N];
JButton[][] jb = new JButton[N][N];
private JPanel pannello2= new JPanel();
LeftButtonListener leftListener = new LeftButtonListener();
public QuadratoFrame() {
Random generator=new Random();
for (int i=0; i<N; i++)
for (int j=0; j<N; j++)
mat[i][j]=generator.nextInt(MAXELEM);
for(int i = 0; i < N; i++)
for (int j=0; j<N; j++)
{
jb[i][j] = new JButton(Integer.toString(mat[i][j]));
pulsante=jb[i][j];
pulsante.addMouseListener(leftListener);
}
pannello2.setLayout(new GridLayout(N,N));
getContentPane().add(pannello2);
pack();
for(int i = 0; i < jb.length; i++)
for (int j=0; j<N; j++)
pannello2.add(jb[i][j]);
}
private class LeftButtonListener implements MouseListener {
public void mouseClicked(MouseEvent event) { }
public void mouseEntered(MouseEvent event) { }
public void mouseExited(MouseEvent event) { }
public void mousePressed(MouseEvent event) {
String input = JOptionPane.showInputDialog("Insert new value:");
}
public void mouseReleased(MouseEvent event) { }
}
}
QUADRATOTEST.CLASS
import javax.swing.*;
/**Una classe che rende attivo il programma Frattali
*tramite la costruzione e la visualizzazione della finestra Frattali nel
main.
*/
public class QuadratoTest {
public static void main(String[] args) {
JFrame myFrame=new QuadratoFrame();
myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myFrame.setSize(800,600);
myFrame.show();
}
}
- 14
- JBuilder applet, adding class to jarI have applet which uses classes like java.util.AbstractList,
java.awt.Point. Unfortunately MS VM doesnt support above(i got IO
exception, above classes not found) So i guess i have to add those
classes to my jar. No idea how to do it... Any help appreciated...
- 14
- Using BigInteger and BigDecimal [WAS: Converting floats to Strings and back]
"Alun Harford" <email***@***.com> wrote in message
news:dlvmk8$j8e$email***@***.com...
>
> Unless you want speed (ie. the arithmetic is hard and you've analysed the
> result of using floating-point to do it), or you want to demonstrate some
> of
> the nasty things that happen with floating point, use BigDecimal.
> a) It requires significantly less use of your brain, which generally
> reduces
> the number of bugs.
> b) Your users shouldn't have to think about the limitations of floating
> point without a very good reason.
I've experimented with using BigInteger instead of int in my code with
mixed results. Code that was integer-math intensive (e.g. finding prime
numbers) typically ran 5 to 7 times slower, which is pretty bad, but not
"noticeable" for typical user applications. I'll probably continue this
practice because for most of my apps, the bottleneck is not the
integer-math, and the extra flexibility is nice.
My question is: is there a "best" way to store BigInteger and BigDecimal
values in databases (particularly in SQL)? The two most obvious solutions to
me is to store them as BLOBs or as strings. I'd probably favor the latter,
because although it uses more storage space and processing time (e.g. to
parse the string back into a BigInteger value), it'll probably be easier to
inspect the DB to make sure all the values are correct during debugging.
- Oliver
- 14
- Thread and ListenerHi,
I'm doing some experiences with JOESNMP. It's very good. Guided by the
examples I was able to build a listener that receives snmp traps. It's
working fine (when running through console).
So I decided to start it automatically, together with my web
application (that is running under tomcat).
I have a servlet that is executed when tomcat starts (using
<load-on-startup>). So I did a call to my new class.
The problem is that this class is actually a listener. When it starts,
it hangs the other procedures, including tomcat initilization.
I tryed to put it under a thread, but it also hangs as soon it starts
to listen for snmp traps.
How do I ran a listner without blocking other processes? I am looking
for a solution that should work both on linux and windows.
I don't know if I made myself understood. Sorry my poor english.
TIA,
Bob
- 14
- log4j questionIs log4j specifically a servlet, or is it an API that can be called from
ANY java program that wanst to do logging?
- 14
- corba-J2EE-EJB-WebSphere?Some help for a newbee?
I've been a c/C++ programmer in VMS, OS/400, and most recently, Windows
and Dot Net. However, I have recently signed on as Q/A manager at a
predominantly Java shop. We have some consultants coming in to assess our
scaleability and architecture, and I'd like to be in a position to at least
make some intelligable noises. I have gotten the sense that there is at
least some compatability between these, but I'm not picking up the extent,
if any, to which any are essentially competing technologies. Is some subset
of these an obvious choice for a medium volume site with lots of active
content, with scaleability, performance, and maintainability being our top
three criteria? Thanks.
Joe
email***@***.com
(please remove "nospam." to reply)
- 14
- JButton - Set font to fillHi,
I want to create the best fitting font for my jbutton, so when the user
expands the UI, the JButton expands or shrinks, so I then change the size of
the font to fill the button correctly..
I am trying something like this on component resize:
- 16
- How does Java make assignments atomic?>From what I understand, Java guarantees that all assignments to
primitive types (except non-volatile 64-bit types) will be atomic.
How does it do this? I thought that the only truly uninterruptable
processor instruction was the test-and-set, and that test-and-set was
the basis from which richer thread synchronization resources typically
provided by an underlying operating system (e.g. semaphores, mutexes,
critical sections) were built.
Does Java internally implement all of its generated assignment opcodes
inside some kind of test-and-set-based wrappers?
Thanks.
|
| Author |
Message |
VirVit
|
 Posted: 2004-1-24 4:08:00 |
Top |
java-programmer, Preferences
Hello!
I've just read about Preferences in JDK1.4 and wonder where java store data
between sessions???? I've found no related files with suitable contant..
Sorry for lammer question ;(
|
| |
|
| |
|
Christophe Vanfleteren
|
| Posted: 2004-1-24 4:23:00 |
Top |
java-programmer >> Preferences
VirVit wrote:
> Hello!
>
> I've just read about Preferences in JDK1.4 and wonder where java store
> data between sessions???? I've found no related files with suitable
> contant.. Sorry for lammer question ;(
>
When using Windows: in the registry.
When using a Unix like system: in xml files.
--
Kind regards,
Christophe Vanfleteren
|
| |
|
| |
|
Neil Campbell
|
| Posted: 2004-1-24 8:57:00 |
Top |
java-programmer >> Preferences
Christophe Vanfleteren wrote:
> When using a Unix like system: in xml files.
... usually in a .java subdirectory of the user's home directory for user
preferences, or in /etc/.java for system-wide settings.
--
Neil Campbell
batneil[AT]thebatcave[DOT]org[DOT]uk
http://www.thebatcave.org.uk
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Index ‹ java-programmer |
- Next
- 1
- When 56K was widebandHere is a movie made in the early days of Arpanet about the coming
networking technology.
http://www.vortex.com/bv/arpanet-72.wmv
It is fun to look back to see how much has changed, and by
extrapolation imagine what is to come.
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
- 2
- jdk15 dopes not compile on i386When I try to compile jdk15 on FreeBSD 7.0 i386, I get this error, but
not on FreeBSD 7.0 amd64.
gmake[1]: Entering directory `/usr/ports/java/jdk15/work/install/make'
gmake[1]: Leaving directory `/usr/ports/java/jdk15/work/install/make'
Build Machine Information:
build machine =
Build Directory Structure:
CWD = /usr/ports/java/jdk15/work/control/make
TOPDIR = ./../..
CONTROL_TOPDIR = ./../../control
HOTSPOT_TOPDIR = ./../../hotspot
J2SE_TOPDIR = ./../../j2se
DEPLOY_TOPDIR = ./../../deploy
INSTALL_TOPDIR = ./../../install
SPONSORS_TOPDIR = ./../../sponsors
Build Directives:
BUILD_HOTSPOT = true
BUILD_MOTIF = false
BUILD_INSTALL = true
BUILD_SPONSORS = false
Hotspot Settings:
HOTSPOT_BUILD_JOBS =
Bootstrap Settings:
BOOTDIR = /usr/local/diablo-jdk1.5.0
BOOTSTRAP J2SDK VERSION: libc.so.6
OUTPUTDIR = /usr/ports/java/jdk15/work/control/build/bsd-i586
Build Tool Settings:
JDK_DEVTOOLS_DIR =
UNIXCOMMAND_PATH = /bin/
COMPILER_PATH = /usr/bin/
DEVTOOLS_PATH = /usr/local/bin/
USRBIN_PATH = /usr/bin/
MOTIF_DIR = /usr/local
CC_VER = 4.2.1
ZIP_VER = 2.32
PATH = /sbin:/bin:/usr/sbin:/usr/bin:/usr/games:/usr/local/sbin:/usr/local/bin:/root/bin:/usr/compat/linux/lib
TMPDIR = /usr/ports/java/jdk15/work/control/build/bsd-i586/tmp
Build Directives:
USE_ONLY_BOOTDIR_TOOLS =
USE_HOTSPOT_INTERPRETER_MODE =
PEDANTIC =
DEV_ONLY =
J2RE_ONLY =
NO_DOCS =
NO_IMAGES =
TOOLS_ONLY =
INSANE =
PARALLEL_COMPILES = false
PARALLEL_COMPILE_JOBS = 2
FASTDEBUG = false
INCREMENTAL_BUILD = false
Build Platform Settings:
PLATFORM = bsd
ARCH = i586
LIBARCH = i386
ARCH_FAMILY = i586
ARCH_DATA_MODEL = 32
TRUE_PLATFORM = FreeBSD
OS_VERSION = 7.0-CURRENT
FREE_SPACE = 573928896
GNU Make Settings:
MAKE = gmake
MAKE VERSION =
MAKECMDGOALS = sanity
MAKEFLAGS =
SHELL = /bin/sh
Target Build Versions:
JDK_VERSION = 1.5.0_12
MILESTONE = p6
BUILD_NUMBER = jack_04_sep_2007_19_05
External File/Binary Locations:
HOTSPOT_SERVER_PATH =
/usr/ports/java/jdk15/work/control/build/bsd-i586/hotspot-i586/server
HOTSPOT_CLIENT_PATH =
/usr/ports/java/jdk15/work/control/build/bsd-i586/hotspot-i586/client
HOTSPOT_IMPORT_PATH =
/usr/ports/java/jdk15/work/control/build/bsd-i586/hotspot-i586/import
MOTIF_DIR = /usr/local
CACERTS_FILE = ./../src/share/lib/security/cacerts
No setting required for Unix Systems
WARNING: Your are not building SPONSORS workspace from
the control build. This will result in a development-only
build of the J2SE workspace, lacking the installation bundles
ERROR: Your BOOTDIR environment variable does not point
to a valid Java 2 SDK for bootstrapping this build.
A Java 2 SDK 5.0_12 build must be bootstrapped using
J2SDK 1.4.2 fcs (or later).
Apparently, your bootstrap JDK is version libc.so.6
Please update your ALT_BOOTDIR setting and start your build again.
Exiting because of the above error(s).
gmake: *** [post-sanity] Error 1
*** Error code 2
Stop in /usr/ports/java/jdk15.
*** Error code 1
Stop in /usr/ports/java/jdk15.
enc#
_______________________________________________
email***@***.com mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-java
To unsubscribe, send any mail to "email***@***.com"
- 3
- Second URL.openstream in second thread causes ProtocolExceptionI have a multi-threaded Java http image proxy service application that
runs fine on Windows 2000. The app retrieves multiple, distinct images
from a webserver with one image retrieval process per thread. The
webserver images change every so often, but each distinct URL used in
my proxy service remains the same. Each thread repeats its image
download every few seconds to retrieve updated images. It all works
great.
I am trying to move this app to a Red Hat Fedora core 4 machine.
Almost everything works except I am getting a protocol exception when
I try to open a second URL stream in a second thread. Within seconds,
one of the threads will throw a ProtocolException error with error
text of '1.1/ 200 OK'. Any one stream/thread combo will work fine.
Trying to start another causes problems.
If I comment out the URL.openStream() call, I can start a dozen
threads, run them for as long as I want and stop them all quite
nicely. Again, all of the code works beautifully on Windows 2000. I'm
not sure if this is a Java problem or, perhaps, a Linux server
configuration problem.
It just seems that the Red Hat server/Java environment is having a
hard time having two http protocol discussions in two threads at the
same time. Occasionally, the threads will both succeed for a few
image revolutions, so there is a little inconsistency in when the
failure occurs.
gdhurst
- 4
- 5
- www.rakeback.gr
This week opportunity
FREE $50
If you're new to SunPoker, we'll match your first deposit up to $50 with
a 100% deposit bonus. See details at:
www.rakeback.gr
If you are interesting about how to play and how to win, please
contact us on e-mail: email***@***.com and we will send you book with
tip and tricks.
Sincerely yours
www.rakeback.gr
- 6
- does IntelliJ do any of these thingsI am taking IntelliJ out for its first spin. See
http://mindprod.com/jgloss/intellij.html
You can see my first program at:
http://mindprod.com/jgloss/arraylist.html#GROWINGARRAYLIST
Everything is going smoothly. I wondered if the following features
exist somewhere and I just can't find them.
1. Reorder methods and declarations in canonical order. I make heavy
use of this in Eclipse to save finding the right spot to insert. I put
methods and declarations I am working temporarily adjacent then
reorder.
2. tidy javadoc.
3. summarise syntax errors, like the Eclipse "problems" panel.
4. quickly ensure Javadoc are complete. I have found the lint which
requires opening a zillion tree elements to find nit picks rather than
true errors.
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
- 7
- Style Sheet inside GUIIs there any open source out there that will allow me to use Style
Sheets inside of a GUI window, preferably a JEditorPane? I need to be
able to open Style Sheet formatted html that is inputted into a
database through an ASP client, and then retrieved in a JAVA client.
- 8
- Can't detect double-click mouse events in MustangThe following relates to Mustang b89 on Windows Server 2003. It may well
relate to earlier Java versions as well but I haven't tested it.
I think my understanding of mouse clicked events is wrong because I don't
get the behaviour I expect. When I implement the following code:
table.getTableHeader().addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent event)
{
System.out.println("Mouse event, clickCount = " +
event.getClickCount());
}
}
I get the following output for every double-click:
Mouse event, clickCount = 1
Mouse event, clickCount = 2
Shouldn't it be just one event with a clickCount of 2? How can I tell the
difference between the first event and a normal single-click?
Thanks,
Wes
- 9
- MI5 Persecution: ?0,000 Reward (3097)
20,000 Reward Offered to Expose the Conspiracy
I am making a pledge for information directly leading to the exposing of the "BBC Newscaster
Conspiracy". The exposing would specifically need to lead to a legally binding admission from Martyn Lewis
or Michael Buerk of the BBC they they were watching me through the TV set.
I would be happy (delighted, in fact) to pay GBP 20,000 sterling in reward for the above admission.
--------------------------------------------------------------------------------
3097
--
Posted via a free Usenet account from http://www.teranews.com
- 10
- Java execute error in LinuxOn Sun, 23 Oct 2005 16:57:56 +0000, Peter Jones wrote:
> Hello all,
> I'm having a problem resolving an error that I keep getting when
> I try to execute a peice of java code. Im using Debian 3.1r0a.
>
> Here's the lo-down. The code is wrtten and complete, no syntax errors at
> all. In fact, it compiles fine. The problem is when I try to execute the
> code. The screenshot says it all. There is no code behind the terminal
> box (where the errors are being displayed). The code you see there is
> really as simple as it looks. Any ideas? I'm open to any suggestions.
> I'm running SableVM, but that hasn't helped.
Two things to remember:
1) Do not post binary articles to a non-binary group. Hint, this is a
non-binary group.
2) Post your questions into the appropriate newsgroup. For beginners
questions, this would be comp.lang.java.help
--
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"
- 11
- Help - Any browser crashes with Java plug in when using parametersWhen ever I try to load java applet I, the plug in works fine unless I
specify any runtime parameters. Then as soon as I try to start up an
applet the browser will shut down right away with no warning or error
messages.
I've tried both 1.3.1_13 and 1.4.2_06 with both Internet Explorer 6 and
Firefox.
I thought maybe it was a Windows patch or something but can't find any
info on that. This happens both on a Windows 2000 and XP SP1 machine.
- 12
- 13
- multi track audio card accessinghallo
I am programming in java for multi track sound card ( 4 - stereo track
-- 8 speakers). I need to output 8 mono wav audio file in eight
different speakers
for this work I have suceeded by playing two mono files in first 2
speakers ( first stereo track ) I am now searching to output other
6 mono files in other 3 different stereo tracks
how to get the port or details for the other 3 stereo tracks
I have attached 3 java files which i have used
<<<<MultiAudioStreamPlayer.java
<<<<BaseAudioStream.java
<<<<SimpleAudioStream.java
for running the below java samples there is no need to have a special
sound card but make sure to change the WAV file name in
SimpleAudioStream.java
program
I am eagerly waiting for your valuable ideas
Yours friendly
vijay
/*
* MultiAudioStreamPlayer.java
*
* This file is part of the Java Sound Examples.
*/
/*
* Copyright (c) 1999 by Matthias Pfisterer
<email***@***.com>
*
*
* This program is free software; you can redistribute it and/or
modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License,
or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the Free
Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
import java.io.File;
import java.io.IOException;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.sound.sampled.SourceDataLine;
// import AudioStream;
/* +DocBookXML
<title>Playing multiple audio files concurrently</title>
<formalpara><title>Purpose</title>
<para>This program plays multiple audio files
concurrently.
It opens each file given on the command line and starts it.
The program uses the class <classname>AudioStream</classname>.</para>
</formalpara>
<formalpara><title>Level</title>
<para>experienced</para></formalpara>
<formalpara><title>Usage</title>
<para>
<cmdsynopsis>
<command>java MultiAudioStreamPlayer</command>
<arg choice="plain"
rep="repeat"><replaceable>audiofile</replaceable></arg>
</cmdsynopsis>
</para></formalpara>
<formalpara><title>Parameters</title>
<variablelist>
<varlistentry>
<term><replaceable>audiofile</replaceable></term>
<listitem><para>the name(s) of the audio file(s) to
play</para></listitem>
</varlistentry>
</variablelist>
</formalpara>
<formalpara><title>Bugs, limitations</title>
<para>Not well-tested</para></formalpara>
<formalpara><title>Source code</title>
<para>
<ulink url="MultiAudioStreamPlayer.java.html">MultiAudioStreamPlayer.java</ulink>,
<ulink url="SimpleAudioStream.java.html">SimpleAudioStream.java</ulink>,
<ulink url="BaseAudioStream.java.html">BaseAudioStream.java</ulink>
</para>
</formalpara>
-DocBookXML
*/
public class MultiAudioStreamPlayer
{
public static void main(String[] args)
{
File soundFile_L = new File("77.wav");
File soundFile_R = new File("88.wav");
SimpleAudioStream audioStream_L = null;
SimpleAudioStream audioStream_R = null;
try
{
audioStream_L = new SimpleAudioStream(soundFile_L);
audioStream_R = new SimpleAudioStream(soundFile_R);
audioStream_L.setPan(1.0f);
audioStream_R.setPan(0.0f);
audioStream_R.start();
audioStream_L.start();
}
catch (LineUnavailableException e)
{
/*
* In case of an exception, we dump the
* exception including the stack trace
* to the console output. Then, we exit
* the program.
*/
e.printStackTrace();
System.exit(1);
}
catch (UnsupportedAudioFileException e)
{
e.printStackTrace();
System.exit(1);
}
catch (IllegalArgumentException e)
{
e.printStackTrace();
System.exit(1);
}
catch (IOException e)
{
e.printStackTrace();
System.exit(1);
}
/*
if (args.length < 1)
{
System.out.println("MultiAudioStreamPlayer: usage:");
System.out.println("\tjava MultiAudioStreamPlayer <soundfile1>
<soundfile2> ...");
System.exit(1);
}
for (int i = 0; i < args.length; i++)
{
String strFilename = args[i];
File soundFile = new File(strFilename);
SimpleAudioStream audioStream = null;
try
{
audioStream = new SimpleAudioStream(soundFile);
if(i==0)
audioStream.setPan(1.0f);
else
audioStream.setPan(0.0f);
}
catch (LineUnavailableException e)
{
e.printStackTrace();
System.exit(1);
}
catch (UnsupportedAudioFileException e)
{
e.printStackTrace();
System.exit(1);
}
catch (IllegalArgumentException e)
{
e.printStackTrace();
System.exit(1);
}
catch (IOException e)
{
e.printStackTrace();
System.exit(1);
}
audioStream.start();
}
*/
/* closing the sound file after playing */
}
}
/*** MultiAudioStreamPlayer.java ***/
//_________________________________________________________________________________________________
/*
* BaseAudioStream.java
*
* This file is part of the Java Sound Examples.
*/
/*
* Copyright (c) 1999, 2000 by Matthias Pfisterer
<email***@***.com>
*
*
* This program is free software; you can redistribute it and/or
modify
* it under the terms of the GNU Library General Public License as
published
* by the Free Software Foundation; either version 2 of the License,
or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free
Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.sound.sampled.FloatControl;
public class BaseAudioStream
implements Runnable
{
/** Flag for debugging messages.
* If true, some messages are dumped to the console
* during operation.
*/
private static boolean DEBUG = true;
/**
* means that the stream has reached EOF or was not started.
* This value is returned in property change callbacks that
* report the current media position.
*/
public static final long MEDIA_POSITION_EOF = -1L;
public static final String MEDIA_POSITION_PROPERTY =
"BaseAudioStream_media_position";
// TODO: better size
private static final int EXTERNAL_BUFFER_SIZE = 4000 * 4;
private Thread m_thread = null;
private Object m_dataSource;
private AudioInputStream m_audioInputStream;
private SourceDataLine m_line;
private FloatControl m_gainControl;
private FloatControl m_panControl;
/**
* This variable is used to distinguish stopped state from
* paused state. In case of paused state, m_bRunning is still
* true. In case of stopped state, it is set to false. Doing so
* will terminate the thread.
*/
private boolean m_bRunning;
protected BaseAudioStream()
{
m_dataSource = null;
m_audioInputStream = null;
m_line = null;
m_gainControl = null;
m_panControl = null;
}
protected void setDataSource(File file)
throws UnsupportedAudioFileException, LineUnavailableException,
IOException
{
m_dataSource = file;
initAudioInputStream();
}
protected void setDataSource(URL url)
throws UnsupportedAudioFileException, LineUnavailableException,
IOException
{
m_dataSource = url;
initAudioInputStream();
}
private void initAudioInputStream()
throws UnsupportedAudioFileException, LineUnavailableException,
IOException
{
if (m_dataSource instanceof URL)
{
initAudioInputStream((URL) m_dataSource);
}
else if (m_dataSource instanceof File)
{
initAudioInputStream((File) m_dataSource);
}
}
private void initAudioInputStream(File file)
throws UnsupportedAudioFileException, IOException
{
/*
try
{
*/
m_audioInputStream = AudioSystem.getAudioInputStream(file);
/*
}
catch (IOException e)
{
throw new IllegalArgumentException("cannot create AudioInputStream
for " + file);
}
if (m_audioInputStream == null)
{
throw new IllegalArgumentException("cannot create AudioInputStream
for " + file);
}
*/
}
private void initAudioInputStream(URL url)
throws UnsupportedAudioFileException, IOException
{
/*
try
{
*/
m_audioInputStream = AudioSystem.getAudioInputStream(url);
/*
}
catch (IOException e)
{
throw new IllegalArgumentException("cannot create AudioInputStream
for " + url);
}
if (m_audioInputStream == null)
{
throw new IllegalArgumentException("cannot create AudioInputStream
for " + url);
}
*/
}
// from AudioPlayer.java
/*
* Compressed audio data cannot be fed directely to
* Java Sound. It has to be converted explicitely.
* To do this, we create a new AudioFormat that
* says to which format we want to convert to. Then,
* we try to get a converted AudioInputStream.
* Furthermore, we use the new format and the converted
* stream.
*
* Note that the technique shown here is partly non-
* portable. It is used here to keep the example
* simple. A more advanced, more portable technique
* will (hopefully) show up in BaseAudioStream.java soon.
*
* Thanks to Christoph Hecker for finding out that this
* was missing.
*/
/*
if ((audioFormat.getEncoding() == AudioFormat.Encoding.ULAW) ||
(audioFormat.getEncoding() == AudioFormat.Encoding.ALAW))
{
if (DEBUG)
{
System.out.println("AudioPlayer.main(): converting");
}
AudioFormat newFormat = new AudioFormat(
AudioFormat.Encoding.PCM_SIGNED,
audioFormat.getSampleRate(),
audioFormat.getSampleSizeInBits() * 2,
audioFormat.getChannels(),
audioFormat.getFrameSize() * 2,
audioFormat.getFrameRate(),
true);
AudioInputStream newStream =
AudioSystem.getAudioInputStream(newFormat, audioInputStream);
audioFormat = newFormat;
audioInputStream = newStream;
}
*/
protected void initLine()
throws LineUnavailableException
{
if (m_line == null)
{
createLine();
openLine();
}
else
{
AudioFormat lineAudioFormat = m_line.getFormat();
AudioFormat audioInputStreamFormat = m_audioInputStream == null ?
null : m_audioInputStream.getFormat();
if (!lineAudioFormat.equals(audioInputStreamFormat))
{
m_line.close();
openLine();
}
}
}
private void createLine()
throws LineUnavailableException
{
if (m_line != null)
{
return;
}
/*
* From the AudioInputStream, i.e. from the sound file, we
* fetch information about the format of the audio data. These
* information include the sampling frequency, the number of
* channels and the size of the samples. There information
* are needed to ask Java Sound for a suitable output line
* for this audio file.
*/
AudioFormat audioFormat = m_audioInputStream.getFormat();
if (DEBUG)
{
System.out.println("BaseAudioStream.initLine(): audio format: " +
audioFormat);
}
/*
* Asking for a line is a rather tricky thing.
* ...
* Furthermore, we have to give Java Sound a hint about how
* big the internal buffer for the line should be. Here,
* we say AudioSystem.NOT_SPECIFIED, signaling that we don't
* care about the exact size. Java Sound will use some default
* value for the buffer size.
*/
DataLine.Info info = new DataLine.Info(SourceDataLine.class,
audioFormat, AudioSystem.NOT_SPECIFIED);
m_line = (SourceDataLine) AudioSystem.getLine(info);
if (m_line.isControlSupported(FloatControl.Type.MASTER_GAIN/*VOLUME*/))
{
m_gainControl = (FloatControl)
m_line.getControl(FloatControl.Type.MASTER_GAIN);
if (DEBUG)
{
System.out.println("max gain: " + m_gainControl.getMaximum());
System.out.println("min gain: " + m_gainControl.getMinimum());
System.out.println("gain precision: " +
m_gainControl.getPrecision());
}
}
else
{
if (DEBUG)
{
System.out.println("FloatControl.Type.MASTER_GAIN is not
supported");
}
}
if (m_line.isControlSupported(FloatControl.Type.PAN/*BALANCE*/))
{
m_panControl = (FloatControl)
m_line.getControl(FloatControl.Type.PAN);
if (DEBUG)
{
System.out.println("max balance: " + m_panControl.getMaximum());
System.out.println("min balance: " + m_panControl.getMinimum());
System.out.println("balance precision: " +
m_panControl.getPrecision());
}
}
else
{
if (DEBUG)
{
System.out.println("FloatControl.Type.PAN is not supported");
}
}
}
private void openLine()
throws LineUnavailableException
{
if (m_line == null)
{
return;
}
AudioFormat audioFormat = m_audioInputStream.getFormat();
m_line.open(audioFormat, m_line.getBufferSize());
}
// TODO: if class can be instatiated without file or url,
m_audioInputStream may
// be null
protected AudioFormat getFormat()
{
return m_audioInputStream.getFormat();
}
public void start()
{
if (DEBUG)
{
System.out.println("start() called");
}
if (!(m_thread == null || !m_thread.isAlive()))
{
if (DEBUG)
{
System.out.println("WARNING: old thread still running!!");
}
}
if (DEBUG)
{
System.out.println("creating new thread");
}
m_thread = new Thread(this);
m_thread.start();
if (DEBUG)
{
System.out.println("additional thread started");
}
if (DEBUG)
{
System.out.println("starting line");
}
m_line.start();
}
protected void stop()
{
if (m_bRunning)
{
if (m_line != null)
{
m_line.stop();
m_line.flush();
}
m_bRunning = false;
/*
* We re-initialize the AudioInputStream. Since doing
* a stop on the stream implies that there has been
* a successful creation of an AudioInputStream before,
* we can almost safely ignore this exception.
* The LineUnavailableException can be ignored because
* in case of reinitializing the same AudioInputStream,
* no new line is created or opened.
*/
try
{
initAudioInputStream();
}
catch (UnsupportedAudioFileException e)
{
}
catch (LineUnavailableException e)
{
}
catch (IOException e)
{
}
}
}
public void pause()
{
m_line.stop();
}
public void resume()
{
m_line.start();
}
public void run()
{
if (DEBUG)
{
System.out.println("thread start");
}
int nBytesRead = 0;
m_bRunning = true;
byte[] abData = new byte[EXTERNAL_BUFFER_SIZE];
// int nFrameSize = m_line.getFormat().getFrameSize();
while (nBytesRead != -1 && m_bRunning)
{
try
{
nBytesRead = m_audioInputStream.read(abData, 0, abData.length);
}
catch (IOException e)
{
e.printStackTrace();
}
if (nBytesRead >= 0)
{
//int nFramesToWrite = nBytesRead / nFrameSize;
if (DEBUG)
{
System.out.println("Trying to write: " + nBytesRead);
}
int nBytesWritten = m_line.write(abData, 0, nBytesRead);
if (DEBUG)
{
System.out.println("Written: " + nBytesWritten);
}
}
}
/*
* Wait until all data are played.
* This is only necessary because of the bug noted below.
* (If we do not wait, we would interrupt the playback by
* prematurely closing the line and exiting the VM.)
*/
// TODO: check how this interferes with stop()
m_line.drain();
if (DEBUG)
{
System.out.println("after drain()");
}
/*
* Stop the line and reinitialize the AudioInputStream.
* This should be done before reporting end-of-media to be
* prepared if the EOM message triggers a new start().
*/
stop();
if (DEBUG)
{
System.out.println("after this.stop()");
}
}
public boolean hasGainControl()
{
return m_gainControl != null;
}
/*
public void setMute(boolean bMute)
{
if (hasGainControl())
{
m_gainControl.setMute(bMute);
}
}
public boolean getMute()
{
if (hasGainControl())
{
return m_gainControl.getMute();
}
else
{
return false;
}
}
*/
public void setGain(float fGain)
{
if (hasGainControl())
{
m_gainControl.setValue(fGain);
}
}
public float getGain()
{
if (hasGainControl())
{
return m_gainControl.getValue();
}
else
{
return 0.0F;
}
}
public float getMaximum()
{
if (hasGainControl())
{
return m_gainControl.getMaximum();
}
else
{
return 0.0F;
}
}
public float getMinimum()
{
if (hasGainControl())
{
return m_gainControl.getMinimum();
}
else
{
return 0.0F;
}
}
public boolean hasPanControl()
{
return m_panControl != null;
}
public float getPrecision()
{
if (hasPanControl())
{
return m_panControl.getPrecision();
}
else
{
return 0.0F;
}
}
public float getPan()
{
if (hasPanControl())
{
return m_panControl.getValue();
}
else
{
return 0.0F;
}
}
public void setPan(float fPan)
{
if (hasPanControl())
{
m_panControl.setValue(fPan);
}
}
}
/*** BaseAudioStream.java ***/
//----------------------------------------------------------------------------------------
/*
* SimpleAudioStream.java
*
* This file is part of the Java Sound Examples.
*/
/*
* Copyright (c) 1999, 2000 by Matthias Pfisterer
<email***@***.com>
*
*
* This program is free software; you can redistribute it and/or
modify
* it under the terms of the GNU Library General Public License as
published
* by the Free Software Foundation; either version 2 of the License,
or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free
Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.sound.sampled.FloatControl;
public class SimpleAudioStream
extends BaseAudioStream
{
/** Flag for debugging messages.
* If true, some messages are dumped to the console
* during operation.
*/
private static boolean DEBUG = true;
// private static final int EXTERNAL_BUFFER_SIZE = 16384;
/**
* This variable is used to distinguish stopped state from
* paused state. In case of paused state, m_bRunning is still
* true. In case of stopped state, it is set to false. Doing so
* will terminate the thread.
*/
private boolean m_bRunning;
public SimpleAudioStream()
{
super();
// m_dataSource = null;
}
public SimpleAudioStream(File file)
throws UnsupportedAudioFileException, LineUnavailableException,
IOException
{
this();
setDataSource(file);
initLine();
}
public SimpleAudioStream(URL url)
throws UnsupportedAudioFileException, LineUnavailableException,
IOException
{
this();
setDataSource(url);
initLine();
}
public AudioFormat getFormat()
{
// TODO: have to check that AudioInputStream (or Line?) is
initialized
return super.getFormat();
}
/*
public void start()
{
if (DEBUG)
{
System.out.println("start() called");
}
m_thread = new Thread(this);
m_thread.start();
if (DEBUG)
{
System.out.println("additional thread started");
}
m_line.start();
if (DEBUG)
{
System.out.println("started line");
}
}
public void stop()
{
m_line.stop();
m_line.flush();
m_bRunning = false;
}
public void pause()
{
m_line.stop();
}
public void resume()
{
m_line.start();
}
*/
/*
public void run()
{
if (DEBUG)
{
System.out.println("thread start");
}
int nBytesRead = 0;
m_bRunning = true;
byte[] abData = new byte[EXTERNAL_BUFFER_SIZE];
int nFrameSize = m_line.getFormat().getFrameSize();
while (nBytesRead != -1 && m_bRunning)
{
try
{
nBytesRead = m_audioInputStream.read(abData, 0, abData.length);
}
catch (IOException e)
{
e.printStackTrace();
}
if (nBytesRead >= 0)
{
int nRemainingBytes = nBytesRead;
// while (nRemainingBytes > 0)
//{
if (DEBUG)
{
System.out.println("Line status (active): " +
m_line.isActive());
System.out.println("Line status (running): " +
m_line.isRunning());
System.out.println("Trying to write (bytes): " + nBytesRead);
}
int nBytesWritten = m_line.write(abData, 0, nBytesRead);
if (DEBUG)
{
System.out.println("Written (bytes): " + nBytesWritten);
}
nRemainingBytes -= nBytesWritten;
//}
}
}
if (DEBUG)
{
System.out.println("after main loop");
}
}
*/
}
/*** SimpleAudioStream.java ***/
- 14
- pack() and BufferedImage in JPanelI want to draw a jpg image in a JFrame, so I used JPEGImageDecoder and read
it into a BufferedImage, which I draw to a JPanel.
But when I add the component (JPanel) to the JFrame, pack() doesn't work,
and I have to setSize() explicitly.
Why doesn't pack() work? I can't do imagePanel.getWidth() either, it's 0
until visible.
(Oh, I should mention, pack() still doesn't work after it's visible...do I
have to wait
until the image is rendered?)
Also, what's the best way to swap images dynamically in this case?
TIA
Jeff
////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////
public class MyImagePanel {
static String filename = "picture.jpg";
public static void main(String[] args) {
JFrame frame = new JFrame("MyImagePanel");
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
MyImagePanel panel = new MyImagePanel();
ImagePanel imagePanel = new ImagePanel(filename);
frame.getContentPane().add(imagePanel, BorderLayout.CENTER);
frame.setSize((int)imagePanel.image.getWidth()+8,(int)imagePanel.image.getHe
ight()+22);
frame.setLocation(100, 100);
frame.setVisible(true);
}
}
class ImagePanel extends JPanel {
BufferedImage image;
public ImagePanel(String filename) {
try {
InputStream in = getClass().getResourceAsStream(filename);
JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(in);
image = decoder.decodeAsBufferedImage();
in.close();
// System.out.println((int)image.getWidth());
// System.out.println((int)image.getHeight());
} catch (Exception e) {
System.out.println(e);
System.exit(0);
}
}
public void paintComponent(Graphics g) {
g.drawImage(image, 0, 0, this);
}
}
- 15
- rxtx problem, please help!Hello!
So I am trying to access a virtual serial port using the rxtx
library. I enumerate the ports, and loop through them attempting to
open each one. Although the portId.isCurrentlyOwned() returns false,
portId.open() still throws a PortInUseException, and when I call
portId.getCurrentOwner(), it returns null.
Here is relevant code:
portList = CommPortIdentifier.getPortIdentifiers();
while (portList.hasMoreElements()) {
portId = (CommPortIdentifier)portList.nextElement();
/* only iterate through serial ports */
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
/* attempt to open the port */
try {
if (portId.isCurrentlyOwned()) {
System.out.println(portId.getName() + " is owned");
} else {
System.out.println(portId.getName() + " is not
owned");
}
serialPort = (SerialPort)portId.open("Square2Plus",
2000);
} catch (PortInUseException e) {
//if the port is unavailable, move to the next one
System.out.println(portId.getName() + " is owned by " +
portId.getCurrentOwner());
continue;
}
}
}
if(portOpen) {
System.out.println(portId.getName() + "is open!");
serialPort.close();
} else {
System.out.println("port not found");
}
Running this code produces:
COM3 is not owned
COM3 is owned by null
COM5 is not owned
COM5 is owned by null
port not found
So if the ports aren't owned, why is it throwing this exception, and
what can I do about it?
Please and thank you all so much!
Joshua
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