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Index ‹ java-programmer
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- 1
- Is native 1.4 jdk useless (SCSL license does not allow internalHi,
I hope that I have understood this wrong, but
if one reads the SCSL license when downloading
sources needed to compile native FreeBSD JDK 1.4,
the attachment "C" that tells about "internal deployment use"
says:
"INTERNAL DEPLOYMENT USE
This Attachment C is only effective for the Technology
specified in Attachment B, upon execution of Attachment D
(Commercial Use License) including the requirement to pay
royalties."
Doesn't this mean that I cannot use the native 1.4 JDK for
anything real without getting commercial license ?
If so, the native 1.4 jdk is useless - one
has to use diablo-jdk 1.3 (no hotspot....) or linux jdk (is
this stable with emulation).
Please, please correct me if I'm wrong.
Ari S.
--
Ari Suutari
Lemi, Finland
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- 5
- Beginner question about JDO best practiceDear all,
this is the first time I'm using JDO/ORM (the JPOX implementation) and
so have a question about best practice.
Let's assume we have a class "Tag" with the only property "String
name" and according setters and getters. The related table has two
columns "PRIMARY BIGINT tag_id" and "UNIQUE VARCHAR name". Note that
the column "name" is unique.
Let's further assume that we manually create some Tag objects during
application runtime. We now want to persist these objects but we don't
care if they are already persisted in the database. If this is the
case, JDO should just attach the object to the database instance. What
is the best practice to accommodate this? Do I have to manually check
every object for existence first? I would like to avoid this.
Let's say the tag "coffee" is already available in the database. I'm
looking for something which works like this:
--8<-snip->8--
Tag tag1 = new Tag( "java" );
Tag tag2 = new Tag( "means" );
Tag tag3 = new Tag( "coffee" );
// no problem
pm.makePersistent( tag1 );
// no problem
pm.makePersistent( tag2 );
// throws SQLException DUPLICATE KEY but should just attach/update
tag3 to database instance
pm.makePersistent( tag3 );
--8<-snip->8--
Thanks for any hint!
- 7
- JTextPane: Workaround for invisible text with hanging indents?Hi all,
I have a hanging indent requirement for paragraph formatting:
<http://java.sun.com/j2se/1.5.0/docs/api/javax/swing/text/StyleConstants.html#FirstLineIndent>
"The amount of space to indent the first line of the paragraph. This value
may be negative to offset in the reverse direction. The type is Float and
specifies the size of the space in points."
A search of Sun's bug database for [set]FirstLineIndent indicates that Sun
has fixed a number of bugs related to rendering negative first line
indents. Does the code I've written below demonstrate another rendering
bug? I'm typing invisible text on multiple platforms with the latest
stable JDK and Mustang beta:
import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
public class InvisibleText extends JFrame {
public InvisibleText() {
JTextPane tp=new JTextPane();
SimpleAttributeSet attrs=new SimpleAttributeSet();
StyleConstants.setFirstLineIndent(attrs, -150.0f);
StyleConstants.setLeftIndent(attrs, 150.0f);
tp.setParagraphAttributes(attrs, true);
JScrollPane sp=new JScrollPane(tp);
sp.setPreferredSize(new Dimension(300, 200));
getContentPane().add(sp);
}
public static void main(String[] args) {
InvisibleText frame=new InvisibleText();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
While typing text finally appears at the left indent position of
subsequent lines.
Assuming my code correctly invokes this API, can anyone come up with a
workaround to make the text appear while it is typed?
Many thanks,
Adam
- 7
- paintImmediately()Is there a reason NOT to use paintImmediately()? It seems to solve a
problem that I've been having with repaint(), but it seems like this
is too easy a solution. Am I looking a gift-horse-in-the-mouth, or is
there some "gotcha" that I haven't run into yet?
Thanks
tom
- 8
- Could you write this sound applet?As a start, consider this simple QBASIC program that generates random
frequencies:
10 frequency = 40 + 400 * RND
20 SOUND frequency, 7
30 GOTO 10
That's fine - except that it plays over the PC speaker - the one that's
just there for the happy beep - and not through the sound card and
proper speakers. You can't control volume, either.
I wonder if anyone would be kind enough to translate the above three
line program into a Java applet. I would like to see whether it looks
simple enough for me to cope with.
If it looks as if I could cope with Java, I would then learn it, and try
to program a way of generating sounds from a mathematical sequence or
formula.
--
Chris
- 10
- Java and avoiding software piracy?On Jul 23, 6:12 am, "Dag Sunde" <email***@***.com> wrote:
> Oh, for God's sake stop it already!
>
> Twisted/nebulous99 is a well-known [insult deleted].
Your claims are incorrect.
> I am really suprised[sic] that the reasonably sensible Java community
> haven't just [death threat deleted]
You are under arrest. You have the right to remain silent. Anything
you say can and will be used against you in a court of law. You have
the right to an attorney. If you cannot afford an attorney, one will
be appointed to you at no cost.
You will confine yourself to your current workstation area until
police arrive. Law enforcement has been notified of your illegal act
and should appear shortly to take you into custody.
- 10
- JRE versionsWe have in our company several applications that require JRE to work.
They have been developed by different people and some require specific
versions of Java to work correctly.
Normally the applications work well individually but sometimes, when we
need to work with some of them that require different JRE versions, we
are in trouble.
How can we deal with this problem? Why last versions of JRE are not
full compatible with the previous ones?
Greetings,
Samu
- 10
- Linux/X-Windows unable to set focus on a modal form (Consulting $ anyone)It appears whenever a modal window is opened on Linux X-Windows the
focus is stolen from the window and you CANNOT use the keyboard or any
peice of code to return focus to the form - let alone set the focus in
the textbox.
This is not just for my modal forms but for something as fundamental
as JOptionPane or simple code like this:
JFileChooser chooser = new JFileChooser();
if (chooser.showOpenDialog(parentComponent) ==
JFileChooser.APPROVE_OPTION) {
}
From trolling through posts I can see no answers which is really sad
for Linux good for Microsoft I guess. How can we deploy on Linux if
you are forced to get carpal tunnel clicking on every form with the
mouse ?
I would be willing to pay some consulting dollars to get this
resolved.
Greg
- 10
- IDE for Java?I downloaded the Sun product, and find it feature rich but slow. Can someone
recommend a more basic (freeware) IDE which will help a newbie without
hiding every bit of code? I can program my way out of a wet paper bag in a
few languages, but want to by-pass some of the learning curve for this
project.
- 10
- ports/69675: Eclipse slow typingSynopsis: Eclipse slow typing
Responsible-Changed-From-To: freebsd-ports-bugs->java
Responsible-Changed-By: ijliao
Responsible-Changed-When: Wed Jul 28 02:09:00 GMT 2004
Responsible-Changed-Why:
over to maintainer
http://www.freebsd.org/cgi/query-pr.cgi?pr=69675
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- 11
- Applet notinitedOn 27-8-2004 11:42, Karl Juul wrote:
> "zoopy" <email***@***.com> wrote in message
> news:412efd64$0$568$email***@***.com...
>
>>On 27-8-2004 0:04, Andrew Thompson wrote:
>>
>>
>>>On Thu, 26 Aug 2004 22:58:47 +0200, zoopy wrote:
>>>
>>>
>>>>Then a new window pops up (title="DIAL IN WEB APPLICATION", "WELCOM TO
>>>>THE NYS...")
>>>
>>It's not a browser window, but a window launched by the Java applet.
>>
>>Which leads to the following as being "not applicable", IMO.
>>
>>
>>>Which leads me to the next point ..pop-ups.
>
>
> This is consistent with my experience trying to access this site from three
> different points...all three machines are running Google Toolbar with
> popup-blocking enabled. Two of those three machines have no problem loading
> the applet, leading me to conclude that popup blocking is not the problem.
> All three machines are running IE 6.0, probably with different
> configurations, though. One machine runs WIN XP Home (applet OK on that
> machine) while the other two use WIN 2000 Pro.
>
> Since two machines have no trouble loading the applet, I would have to
> conclude that the 83 reported errors are not fatal errors and the expired
> certificate wouldn't seem to be the problem either...
>
> Karl
>
>
Another thought: you're using a https, i.e. secure socket connection. I
don't exactly know how the SSL exactly works, but I think it is also on
the basis of certificates.
Could it be that the "problem" browser doesn't have an up-to-date set of
root certificates (to which another certificate can be traced back).
IIRC the updatesite of microsoft (windowsupdate.microsoft.com) once
offered an update of root certificates for Windows (or IE).
--
Regards,
Z.
- 12
- Java3D Newbie ! ! "No compatible device" error is a driver, not Java3d problem
Java3d requries an OpenGL or DirectX rendering layer,
------------------------------------
and I think it not a Java3d problem but your system
is set up to render in with OpenGL or DirectX.
I reccomend OpenGL, I try to avoid "Microsft Only" solutions,
and they don't work very well on my Linux system.
Most Linux systems have a simple OpenGl demo: gears
and typing : gears
either runs a simple OpenGL demo or tells you
OpenGL can't run.
Check these links:
http://archives.java.sun.com/cgi-bin/wa?A2=ind0309&L=java3d-interest&P=26329
http://www.mail-archive.com/email***@***.com/msg25938.html
John Smart wrote:
> hi,
>
> I just wanted to start a demo ("HelloUniverse")
> but I get the error:
>
> " No campatible device found,
> please switch to other display mode and try again!"
>
> I switched to all screen resolutions but it still didn't work!
>
> Please help me!
>
> Thanks!
>
>
http://groups.google.com/groups?group=comp.lang.java.3d&selm=3f91437f%240%2415688%249b622d9e%40news.freenet.de
John, please include more relevant information
both in the subject line and body of your posts:
for rendering problems posting information about
your OS and video card helps us solve the problem.
I had to download and install OpenGL from Microsoft's
site when I was running Windows95, I think OpenGL
comes pre-installed on current versions of Windows,
I've upgraded from Windows-XX to Linux
to avoid the Micrsoft viruses, DRM amd expense
and I don't want my programs limited to just
one platform when the growth is elsewhere.
Java & Linux lets you be free, and go to mars ...
Nasa uses Java3d & VRML for the Mars Rover
-------------------------------------------
http://www.frontiernet.net/~imaging/Nasa_3d_animation.html
-- Paul, Java Developer & Web Animator
--------------------------------------
Imaging the Imagined: Modeling with Math & a Keyboard
- 13
- File Persistence In the Session ObjectI am developing a Struts1.1 based application, that returns an Excel
File generated by Jakarta's POI classes. One of the requirements is
that the file be stored in the SESSION ONLY, not on the file system.
Is this even possible? Doesn't a file need to be physically present
before a reference to it can be stored in the session?
prompt insight would be most appreciated, as I'm working against a
deadline.
Thanks!
PK
- 13
- Java programmer Job openingInternational company has 2 job openings for Java programmers. Requirements:
3 years experience java programming, self-sufficient, responsible, able to
lead extremely important projects, knowledge of unix/linux. Workplace
Lisbon. Great career opportunity.
Send applications to Filipe Mendes, email***@***.com
- 15
- Javaws.exeI was shocked to notice that Javaws.exe has devolved. It is no longer
an end user tool to manage jawaws apps.
IIRC you used to be able to put a file on the command line. Now you
need a weird URL file://localhost/E:/mindprod/webstarts/esper.jnlp
Anyway you used to be able to launch from the GUI.
--
Bush crime family lost/embezzled $3 trillion from Pentagon.
Complicit Bush-friendly media keeps mum. Rumsfeld confesses on video.
http://www.infowars.com/articles/us/mckinney_grills_rumsfeld.htm
Canadian Mind Products, Roedy Green.
See http://mindprod.com/iraq.html photos of Bush's war crimes
|
| Author |
Message |
PlasmaDragon
|
 Posted: 2004-2-23 6:55:00 |
Top |
java-programmer, Inline bytecode?
Is it possible to do iline bytecode in Java? Sort of like inline asm
in c++, but platform independent.
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nos
|
| Posted: 2004-2-23 8:42:00 |
Top |
java-programmer >> Inline bytecode?
"PlasmaDragon" <email***@***.com> wrote in message
news:email***@***.com...
> Is it possible to do iline bytecode in Java? Sort of like inline asm
> in c++, but platform independent.
I think not.
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PlasmaDragon
|
| Posted: 2004-2-24 8:27:00 |
Top |
java-programmer >> Inline bytecode?
"nos" <email***@***.com> wrote in message news:<I%b_b.39392$Xp.177329@attbi_s54>...
> "PlasmaDragon" <email***@***.com> wrote in message
> news:email***@***.com...
> > Is it possible to do iline bytecode in Java? Sort of like inline asm
> > in c++, but platform independent.
>
> I think not.
Is there anyway at all to link bytecode and java into the same program then?
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nos
|
| Posted: 2004-2-24 9:08:00 |
Top |
java-programmer >> Inline bytecode?
"PlasmaDragon" <email***@***.com> wrote in message
news:email***@***.com...
> "nos" <email***@***.com> wrote in message
news:<I%b_b.39392$Xp.177329@attbi_s54>...
> > "PlasmaDragon" <email***@***.com> wrote in message
> > news:email***@***.com...
> > > Is it possible to do iline bytecode in Java? Sort of like inline asm
> > > in c++, but platform independent.
> >
> > I think not.
>
> Is there anyway at all to link bytecode and java into the same program
then?
Look into JNI (java native interface) you can write methods in c/c++ or
whatever
and invoke them from a java method.
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PlasmaDragon
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| Posted: 2004-2-25 5:07:00 |
Top |
java-programmer >> Inline bytecode?
Thanks for the help.
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sgmanohar
|
| Posted: 2004-2-27 18:41:00 |
Top |
java-programmer >> Inline bytecode?
http://www.cs.rpi.edu/~moorthy/Courses/compiler99/Assembler/
or
http://mrl.nyu.edu/~meyer/jasmin/
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Index ‹ java-programmer |
- Next
- 1
- "class not found".I'm getting the dreaded "class not found" error. I've Googled this
error and found that it's quite common, but not in exactly the way I
get it. My applets run fine on my machine, both when tested locally
via a local HTML file, and also when going to website, but gives the
"Class not found" error other machines. Anyone have any idea what
might be wrong?
I suspect it may be a codebase error, but I've tried the following in
my HTML file without success:
<APPLET CODE="moonCalendar.class"
name = "moonCalendar" WIDTH=1000 HEIGHT=350>
<APPLET CODE="moonCalendar.class" codebase="."
name = "moonCalendar" WIDTH=1000 HEIGHT=350>
<APPLET CODE="moonCalendar.class"
codebase="http://www.ckolchak.com"
name = "moonCalendar" WIDTH=1000 HEIGHT=350>
You can see if it works on your machine by going to:
http://www.ckolchak.com/astroCalendar.htm
- 2
- Java Object Persistence (JSP & Java)Hi all.
I'm currently working on a simulation with a web frontend. The
simulation is based on 3 components:
- A Webfrontend
- A persister (which is the object of my quetsio :-)
- A WorkHorse
The Workhorse is doing the actual simulation while the web frontend is
used to interact with the Simulation (queueing and dequeueing new
events to the simulation stack).
Now my question is what the best choice for the persister would be.
I found http://www.prevayler.org/wiki.jsp which looks nice but I don't
know if it's the best choice. Is there a library that transparently
saves and loads whole Object dependencies from an SQL Database, or is
an Object Cloud better?
What is your experience with this/other libraries?
- 3
- 4
- Intellij 5.1 compile time error..hi,
I am using Intellij 5.1 version. Each time I build the project I get
an error:
error: Compiling Web Module 'web':Invalid file
and the file is in the "deploy" folder
So each time I go into the folder and maually delete the .war file and
then when I build the project it works fine.
>From what I have seen one more person using the same version has this
problem. but the one's using the earlier versions don't have this
problem.
Is there any solution for this?
thanks,
- 5
- JNI CallStaticVoidMethod fails after N callsI have written an application in Java and C on the Solaris 10 (x86)
platform using the JDK 1.5.0_09. The Java code calls a native method
"startButtonWatcher," which then forks, the parent process returning,
and the child process initiating an event loop that calls a static
method, "sendButtonEvent," on a Java class "ButtonWatcher."
The problem is that on the 65 invocation, the CallStaticVoidMethod will
hang. There is no core file or pid log file produced. (it will also
hang for CallVoidMethod as well if I remove the static declaration in
ButtonWatcher.)
I have also added a main() function to the C code so that it can be
compiled and run as an executable rather than a library file loaded
from Java, and the the same loop will be fine, the Call*Method call
being exected forever (or over a million times at least). The only
difference in the code is the JVM--in the sharable library, it uses the
JVM of the class that calls the native method, and the standalone has
to create its own. What could be the problem? Thanks!
- 6
- the MI 5 spammeremail***@***.com wrote:
> Incorrect. None of the nasty things that you have said or implied
> about me are at all true.
Does this mean you still accuse me of hacking OpenOffice.org's mailing
lists? What a hoot!
- 7
- You have received 5 notifications from your fans!Alyssa
<http://www.fanbox.com/socnet/EmailStat.aspx?cmp=&xyz=1&lit=5&me=xAr3pqu
jU0kBSGmCF6dKsg==&fan=F1Qw1zM6IEk=&opg=http://profile.fanbox.com/profile
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ain.aspx?messages=3> to view Alyssa's profile and to accept or reject
her fan request.24 hours ago
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her fan request. 24 hours ago
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her fan request. 24 hours ago
There are 2 additional fan requests to review
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ain.aspx?messages=> Change your Email Summary Settings
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You can control
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nces/Main.aspx?open=emailPref> the frequency of these summary emails.
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- 8
- Creating an object during runtimeI'm trying to generate an object name during run time, and then create an
object with the contents of that variable. You can see that I'm trying to
also make the object name self generating (almost, the 'y' variable isnt
being incremented yet), putting two values ('y' and 'C'). My apologies for
poor coding structure / lack of comments, but I'm am a bit lost on how to
work it out. MANY thanks in advance.Heres what I have so far:
public class testVariable
{
private String name = "";
private String New_name = "";
private int y = 2;
public testVariable()
{}
public void test(String x)
{
name = x;
New_name = name + y ;
System.out.println(New_name);
}
public String getNew_name()
{
return New_name;
}
public static void main(String[] args)
{
int z = 2;
testVariable Darren = new testVariable();
Darren.test("C");
testVariable "c"+ z = new testVariable();
String Old_name = New_name;
}
}
- 9
- how to hide tabs in JTabbedTableHello all
I have a JTabbedTable with many tabs with JPanel in it. I want in a state,
only some tabs are shown and other states, other tabs are shown. I used
setVisible(boolean) but it does not work. could you please help
thank you
S.Hoa
- 10
- Problem running the hello world servletI installed j2sdk1.4.2_12, and apache tomcat 4.1.34, on a windows XP
box. I set the following environment variables:
CATALINA_HOME C:\apache-tomcat-4.1.34
CLASSPATH C:/Program
Files/Java/jre1.5.0/lib/xt/QTJava.zip;C:/j2sdkee1.3.1/lib
J2EE_HOME C:/j2sdkee1.3.1
JAVA_HOME C:/j2sdk1.4.2_12
PATH C:\j2sdk1.4.2_12\bin\
I edited the web.xml in C:\apache-tomcat-4.1.34\conf and uncommented
the invoker servlet tag so that I can run servlets.
I can now access jsp and html pages with tomcat, but when I tried to
run HelloWorld Servlet, it gives the following error:
ava.util.MissingResourceException: Can't find bundle for base name
LocalStrings, locale en_US
at
java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:838)
at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:807)
at java.util.ResourceBundle.getBundle(ResourceBundle.java:578)
at HelloWorldExample.doGet(HelloWorldExample.java:38)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:696)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at
org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:417)
at
org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:131)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:696)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:198)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:595)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:432)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:954)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:138)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:595)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:432)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:954)
at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2459)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:132)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:595)
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:593)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:593)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:432)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:954)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:126)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:595)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:432)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:954)
at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:534)
What could be the problem?
- 11
- "Linked List" AssistanceCan someone please point me to a url that will show me how to create a
linked list.
This needs to be a very simple example as Linked Lists are confusing me.
Thankyou for your assistance.
- 12
- Java Timer, swingDear Java experts,
I'm struggling with timers. I've used javax.swing.Timer in my program. But
when one doesn't have the jre installed, my program doesn't work. It then
gives a class not found exception in the browser. It only works on the sun
virtual machines which you have to download from the website like some jre.
I quess the swing library isn't supported by a lot of virtual machines. But
I'm happy about how the timer works in my program because it makes use of
the actionListener.
Is there some easy solution? Using a simple Timer like the swing version and
let it work on any virtual machine/ jre?
best regards,
Piet den Dulk (Netherlands)
- 13
- pass by referenceAndreas Leitgeb wrote:
> Patricia Shanahan <email***@***.com> wrote:
>> The issue is more critical for people for whom "pass by reference" is
>> familiar language. They will think they know what it means, and have to
>> find out somehow that it means something entirely different, when
>> talking about Java, that it does when talking about other languages.
>
> By the way, this is also true for "reference" itself. They also have
> to learn that what Java calls a reference wouldn't be called that way
> in other languages, for exactly the reasons you wrote (null allowed,
> assignment-semantics).
Indeed, I think the choice of "reference" to mean "pointer or null" was
a bad one. It would have been better to call a pointer a pointer, and
note that it can be null.
For the benefit of people transitioning from C or C++, it may be
necessary to note that it does not have pointer arithmetic or unsafe
conversions.
> Why is it ok, to talk of references in Java, but have an entirely
> different meaning of "reference" in mind in context of the phrase
> "pass by reference"?
"pass by reference" (or more usually "call by reference") is a long
standing term with a meaning independent of the use of "reference" as a
freestanding term. I learned it long before I knew any language in which
one could actually have a reference. I don't see any reason why having
to learn a Java-specific meaning of reference should require people to
learn special meanings of other terms, especially when with have a
perfectly good phrase, "pass reference by value", that is only one word
longer and says *exactly* how Java behaves.
Patricia
- 14
- How to make sure stdout and stderr is caught from runtimeexecHi,
I have written a class that handles stdout and std err from a unix
command. How can I make sure that both threads have finished? Do I need
to synchronzie my StreamConverter?
cheers,
//mikael
> public class RuntimeExec {
>
> public RuntimeExec() {
> }
>
> /**
> * Executes a command
> * @param command
> * @return The result of the command
> * @throws IOException
> */
> public String exec(String command) throws IOException {
> int exitValue = 0;//0 - executed ok.
> String stdOut = null;
> String stdErr = null;
> String result = null;//result from clearcase operation
> StringBuffer out = new StringBuffer();
> StringBuffer err = new StringBuffer();
> Process process = Runtime.getRuntime().exec(command);
> StreamConverter outSc = new StreamConverter(process.getInputStream(),out);
> StreamConverter errSc = new StreamConverter(process.getErrorStream(),err);
> Thread outThread = new Thread(outSc);
> Thread errThread = new Thread(errSc);
> outThread.start();
> errThread.start();
> //Wait until the prosess finish
>
> long delayMillis = 5000; // 5 seconds
> try {
> //wait for threads to die.
> outThread.join(delayMillis);
> if (outThread.isAlive()) {
> // Timeout occurred; thread has not finished
> } else {
> // Finished
> }
> } catch (InterruptedException e) {
> // Thread was interrupted
> }
>
>
>
>
> return result;
>
>
> }
>
> // bridge between byte and character stream.
> class StreamConverter implements Runnable {
> private InputStreamReader isr = null;
> private StringBuffer sb = null;
> // end of steam
> private static final int EOS = -1;
>
> public StreamConverter(InputStream is, StringBuffer sb) {
> isr = new InputStreamReader(is);
> this.sb = sb;
> }
>
> public void run() {
> int character = 0;
> try{
> while ((character = isr.read()) != EOS) {
> sb.append((char)character);
> }
> }catch(IOException ioe){
> System.out.println("Could not read std out!"+ioe.getMessage());
> }
> }
>
> }
>
>
> }
- 15
- Image from WebHi all, I need to read an image located in http://www.xxx.yyy/eee/test.jpg
...how can I do?
How can I display once readed in a swing interface?
thanks.
mario
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