[4091] in java-interest
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java-interest-digest Thursday, 7 December 1995 Volume 01 : Number 003
----------------------------------------------------------------------
From: Sidney Shaw <sidshaw@ix.netcom.com>
Date: Wed, 06 Dec 1995 20:31:22 -0800
Subject: Re: file paths in applications
Try getDocumentBase(). I believe it returns the path of the current
directory.
------------------------------
From: "John D. Kane" <john@insightnews.com>
Date: Thu, 07 Dec 95 00:28:00 PST
Subject: [none]
While I play with applets, I like to place output strings throughout the
code, just to make sure the applet reaches certain critical points.
However, I'm never sure what the applet does as none of the debugging
strings I use in the program ever show up (or rarely show up) -- I think
it's a combination of threading and repainting. So I started using sounds at
certain places in the program to see if execution reached that point. Even
though this works ok, I'd much rather see string messages displayed in a
window. What I should do before playing around with too many more applets is
find a way of displaying output on the screen while the program runs, no
matter what, so I can easily trace the program execution. Otherwise I never
know if an applet ends or aborts. I tried using showStatus(), but the status
line information rarely stays for long, if I see it flash by at all.
I'm writing Beta applets and using Netscape to view them, but I don't think
any of the System.out (or whatever the commands are for standard output)
work at all. When I try to put strings into the repaint method, I have
strings repainted over top of strings fast enough that this method is rather
useless. I thought that I might be able to write information to a file, but
is there an easier method, like the debugger -- I still haven't got that
thing to run yet (I haven't downloaded the new JDK 2.0 w/interactive
debugger yet either). I'm looking for a clean, slick, and rather painless
way of doing this. Any suggestions?
John
------------------------------
From: George E Crawford <gec2@Ra.MsState.Edu>
Date: Thu, 7 Dec 1995 02:00:57 -0600
Subject: sizeof() operation
Is there an equivalence of a sizeof() operation in Java?
For example, file.skipBytes(sizeof(int)*16);
Thanks,
George
------------------------------
From: Graham Kehily <gra@cityscape.co.uk>
Date: Thu, 7 Dec 1995 08:41:53 GMT
Subject: Re: JavaScript
>Just read the press release about JavaScript
>(http://java.sun.com/pr951204-03.html).
>Cool!
JavaScript was just demo'd at WebInnovation in San Francisco. In the current
Netscape beta version (2.0-b3) it's still called LiveScript (look for
the <SCRIPT LANGUAGE="LiveScript"> tag.)
Even better, download the Shockwave plug-in from www.macromedia.com and
look again at the toolbar at the bottom of the press release mentioned above!
Cheers,
Graham.
- -----------------------------------------------------------------------------
Graham Kehily Invicta Internet Services Ltd
[+44] (0)385 225022 gra@cityscape.co.uk
- -----------------------------------------------------------------------------
------------------------------
From: Caskey Dickson <caskey@perfectmarket.com>
Date: Thu, 7 Dec 1995 01:50:08 -0800
Subject: Custom mime content handlers
How do we extend the sun.net.www.content.MIMETYPE.SUBTYPE packages to handle
our own custom types. I need to be able to construct objects based upon the
data recieved and don't want to send it all as strings, then build a parser.
Any hints? Anyone done this?
Thanks,
Caskey
- - -
- -Caskey Dickson caskey@perfectmarket.com-
- -Director of Programming 818.542.3820-
- -PerfectMarket Inc. (fax)818.542.3837-
- - -
------------------------------
From: Per Danvind <perry@cdt.luth.se>
Date: Thu, 07 Dec 1995 11:10:38 +0100
Subject: Re: Painting Images
>
> Howdie java folks,
> I have an easy question, which is driving me crazy! How does one load
> images in completely
> before the applet starts? My applets seem to display the images while
> their loading. Is it possible to hold off on starting the applet until
> these images are loaded?
>
> Thanks in advance,
> Jamie Cristini
> -
> This message was sent to the java-interest mailing list
> Info: send 'help' to java-interest-request@java.sun.com
Hi,
Try checking the width of the image you want to wait for.
It will be -1 until it's loaded. Put it in a while-loop
with a sleep() inside or someting like that.
Good luck!
- --
Per
------------------------------
From: c2800253@csns02.comp.polyu.edu.hk (Yeung Ka Wai (BACS4 Class B student))
Date: Thu, 7 Dec 1995 19:18:39 +0800 (HKT)
Subject: Question on implement native method
Hi,
As I know it is not allowed to call external C program within applets
because of security. If I just want to keep a local copy of my C program and
call it within applets locally. Is it possible for me to do this? If so,
how can I do this? Should I use the steps about native method in Java User
Guide? Please give me some hints.
Thanks for your concern.
Rufina Yeung
Hong Kong Polytechnic
------------------------------
From: Horlock.Neil.at.ext06lon@ft.com (Horlock Neil)
Date: Thu, 7 Dec 1995 10:35:03 +0000
Subject: Re[2]: GIF/Animation editing software
I have had a couple of responses to my request for GIF editing software all
pointing me in more or less the same direction. The answer seems to be
THE GIMP available from http://www.csua.berkeley.edu/~gimp/
I grabbed it yesterday and wrestled it through the Sun compiler and lo and
behold I have what appears to be a pretty cool editor.
Thanks to John Mason Scott for the first reply and the others who followed
him.
Neil
horlock.neil@ft.com
------------------------------
From: Mark Florence <mark.florence@parallax.co.uk>
Date: Thu, 07 Dec 1995 11:48:43 +0000
Subject: Re: Can java load a new URL from you???
> Can I build a applet with AWT with a button on it
> and after the user clicks on the button
> java will load a new URL.
> Simply issue getAppletContext().showDocument(..url..). This works under
Netscape beta b3.
Mark Florence
------------------------------
From: Edd Dumbill <edmundd@compnews.co.uk>
Date: Thu, 7 Dec 1995 13:11:17 +0000 (GMT)
Subject: Re: your mail
the latest netscape has a java console where all exception messages and
the like go to (the stderr output from java). this should display
anything you output to stderr.
Edd.
Edd Dumbill - Software Engineer - PA Data Design - +44 1430 488224
mailto:edmundd@padd.press.net - http://www.pa.press.net/people/edmundd
and i like the way you're broken and i'll like you when you're old
------------------------------
From: Jonathan_Mark_Smith@CCMAIL.PRUSEC.COM
Date: Thu, 07 Dec 95 08:17:05 EST
Subject: [none]
While I play with applets, I like to place output strings throughout the
code, just to make sure the applet reaches certain critical points.
However, I'm never sure what the applet does as none of the debugging
strings I use in the program ever show up (or rarely show up) -- I think
it's a combination of threading and repainting. So I started using sounds at
certain places in the program to see if execution reached that point. Even
though this works ok, I'd much rather see string messages displayed in a
window. What I should do before playing around with too many more applets is
find a way of displaying output on the screen while the program runs, no
matter what, so I can easily trace the program execution. Otherwise I never
know if an applet ends or aborts. I tried using showStatus(), but the status
line information rarely stays for long, if I see it flash by at all.
I'm writing Beta applets and using Netscape to view them, but I don't think
any of the System.out (or whatever the commands are for standard output)
work at all. When I try to put strings into the repaint method, I have
strings repainted over top of strings fast enough that this method is rather
useless. I thought that I might be able to write information to a file, but
is there an easier method, like the debugger -- I still haven't got that
thing to run yet (I haven't downloaded the new JDK 2.0 w/interactive
debugger yet either). I'm looking for a clean, slick, and rather painless
way of doing this. Any suggestions?
John
- -
This message was sent to the java-interest mailing list
Info: send 'help' to java-interest-request@java.sun.com
------------------------------
From: Darren Roberts - CM53-4 <derober0@pine.shu.ac.uk>
Date: Thu, 7 Dec 1995 13:47:35 +0100 (MET)
Subject: Applet not initialised!
Hello,
I am sure i have previously seen a mail concerning this matter
but i can't seem to find it. I am using win95 with netscape 2.0b3
and when i try to load an applet within netscape it replies with
the message "Applet not loaded, can't initialise" or something to
that effect.
Can anybody tell me why, and is there a solution.
Thank you
Darren.
------------------------------
From: Jonathan_Mark_Smith@CCMAIL.PRUSEC.COM
Date: Thu, 07 Dec 95 08:40:59 EST
Subject: Can someone please help me on 3 java things.
I AM SORRY FOR SEND THIS AGIN BUT THE FIRST TIME I FORGOT THE SOURCE CODE
AT THE END OF THE EMAIL
Here is the list good luck.
1) I need to save information from my java applet to a flat file on my
site.
I need to find out how to read the file and write to the file on my
web site from a applet.
2) Can someone show me a sample on how to use java as a cgi program.
How can a form pass it data?
How can a java applet pass it data?
How can the java cgi program read the data in?
3) In following source code I have a listbox I let the user pick a
item from. Can someone please show me how to turn my listbox into
option buttons. Also How did I tell which button is selected?
I am new to java as you can see. But I did read about 3 books on java
none of the books got me to the point of writing a applet to let the
user read and writer information from my site and about AWT.
Can this be done????
I need to get something up by the end of the week so any help will be
alot of help. So please send me any sample you how??
Once again thanks to all you great java programmers on the net.
Johnathan Mark Smith
import java.awt.*;
import java.applet.*;
public class Test extends Applet
{
Panel infobar;
Panel mainbar;
TextField name;
TextField email;
TextField usrl;
public void init()
{
setLayout(new BorderLayout());
setBackground(Color.gray);
setFont(new Font("Helvetica", Font.BOLD, 12));
}
public void start()
{
Panel p = new Panel();
p.setLayout(new GridLayout(2,2));
p.add(name = new TextField("Name", 30));
p.add(email = new TextField("E-mail address",30));
p.add(usrl = new TextField("URL",30));
mainbar = new Panel();
mainbar.setLayout(new BorderLayout());
mainbar.add("West", p);
List l = new List();
l.setMultipleSelections(false);
l.addItem("Java is Cool");
l.addItem("This applet is cool");
l.addItem("I want more");
l.addItem("John is greats");
add("West", l);
add("Center", mainbar);
infobar = new Panel();
infobar.add(new Button("Send data to Site"));
infobar.add(new Button("Clear all Fields"));
infobar.add(new Button("Reset all Fields"));
infobar.setBackground(Color.red);
add("South", infobar);
}
public boolean action(Event evt, Object arg)
{
if("Send data to Site".equals(arg))
{
showStatus("If this worked... the data would be
submitting");
return true;
}
else if("Clear all Fields".equals(arg))
{
name.setText("");
email.setText("");
usrl.setText("");
return true;
}
else if("Reset all Fields".equals(arg))
{
name.setText("Your name here please");
email.setText("Your e-mail address here please");
usrl.setText("Your URL have please");
return true;
}
else if(evt.target instanceof List)
{
showStatus(arg.toString());
return true;
}
return false;
}
}
------------------------------
From: Aaron Shtromas <ams@mci.net>
Date: Thu, 7 Dec 1995 09:07:26 -0500 (EST)
Subject: Re: your mail
On Thu, 7 Dec 1995, John D. Kane wrote:
i think, in netscape 2.02b or 2.03b you can open a netscape console
from the options menu. it seems, it is only appears there if your
applet uses System.out.
- -a
>
> While I play with applets, I like to place output strings throughout the
> code, just to make sure the applet reaches certain critical points.
> However, I'm never sure what the applet does as none of the debugging
> strings I use in the program ever show up (or rarely show up) -- I think
> it's a combination of threading and repainting. So I started using sounds at
> certain places in the program to see if execution reached that point. Even
> though this works ok, I'd much rather see string messages displayed in a
> window. What I should do before playing around with too many more applets is
> find a way of displaying output on the screen while the program runs, no
> matter what, so I can easily trace the program execution. Otherwise I never
> know if an applet ends or aborts. I tried using showStatus(), but the status
> line information rarely stays for long, if I see it flash by at all.
>
> I'm writing Beta applets and using Netscape to view them, but I don't think
> any of the System.out (or whatever the commands are for standard output)
> work at all. When I try to put strings into the repaint method, I have
> strings repainted over top of strings fast enough that this method is rather
> useless. I thought that I might be able to write information to a file, but
> is there an easier method, like the debugger -- I still haven't got that
> thing to run yet (I haven't downloaded the new JDK 2.0 w/interactive
> debugger yet either). I'm looking for a clean, slick, and rather painless
> way of doing this. Any suggestions?
> John
> -
> This message was sent to the java-interest mailing list
> Info: send 'help' to java-interest-request@java.sun.com
>
- ----------------------------------------------------------------
Aaron Shtromas MCI Internet Engineering
ams@mci.net 2100 Reston Parkway
Tel. 703-715-7334 Reston, VA 22091
------------------------------
From: "Elliotte Rusty Harold" <Elliotte@blackstar.com>
Date: Thu, 7 Dec 1995 09:53:39 EST
Subject: Re: const
> As far as I can see the C++ "const" keyword is not present in Java.
> In Java, how can you write an accessor function for a class data
> member that returns the data member object but doesn't allow callers
> to modify it? Was this deemed to be an unimportant feature of C++?
>
Declare the variable final, e.g.
public static final int myVar = 0
final variables can't be modified.
- --
Elliotte Rusty Harold Black Star Publishing Co., Inc.
elliotte@blackstar.com 116 East 27th Street
elharo@shock.njit.edu NY NY 10016
------------------------------
From: "Elliotte Rusty Harold" <Elliotte@blackstar.com>
Date: Thu, 7 Dec 1995 10:05:56 EST
Subject: Re: sizeof() operation
> Is there an equivalence of a sizeof() operation in Java? For
> example, file.skipBytes(sizeof(int)*16);
sizeof isn't necessary in Java because all sizes are precisely
defined. i.e. an int is always 4 bytes. In the example you cite just
use file.skipBytes(4*16).
This may not seem to be adequate when dealing with objects that
aren't base data types. However even if you did know the size of
a particular object, you couldn't do anything with it anyway.
There's no copy or serialize method in the Object class so there's no
reason to need that information. This is all part of Java separating
you from physical memory.
- --
Elliotte Rusty Harold Black Star Publishing Co., Inc.
elliotte@blackstar.com 116 East 27th Street
elharo@shock.njit.edu NY NY 10016
------------------------------
From: John Smart <jsmart@smartny.com>
Date: Thu, 7 Dec 1995 09:46:36 -0500 (EST)
Subject: Re: Java on OS/2
On Wed, 6 Dec 1995 Jonathan_Mark_Smith@CCMAIL.PRUSEC.COM wrote:
IBM Licenses - Java - New York Times - December 7, 1995.
> Date: Wed, 06 Dec 95 16:02:40 EST
> From: Jonathan_Mark_Smith@CCMAIL.PRUSEC.COM
> To: java-interest@java.sun.com
> Subject: Java on OS/2
>
> Does Java run on OS/2
>
> -
> This message was sent to the java-interest mailing list
> Info: send 'help' to java-interest-request@java.sun.com
>
------------------------------
From: "R.Volkmann" <m224873@ws1768.mdc.com>
Date: Thu, 7 Dec 95 09:10:25 -0600
Subject: final keyword usage
A few people on the list have told me that in Java "final" takes the place
"const" in C++. Which of the following are valid uses of "final"?
- - used to create a constant
final float pi = 3.1415928;
- - used to declare that a function argument will not be modified
class City {
public float milesTo(final City destinationCity) { ... }
...
}
- - used to prevent callers from changing an object returned from a function
class Foo {
public final String data() { return data_; }
protected String data_;
}
|------------------------------------------------------------|
| R. Mark Volkmann - Principal Specialist Programmer/Analyst |
| McDonnell Douglas Aerospace, St. Louis, Missouri, USA |
| email m224873@svmstr01.mdc.com, voice (314)232-0498 |
|------------------------------------------------------------|
"As the evening sky faded from a salmon color to a sort of flint gray,
I thought back to the salmon I caught that morning, and how gray he was,
and how I named him Flint." from Deep Thoughts by Jack Handy
------------------------------
From: Jonathan_Mark_Smith@CCMAIL.PRUSEC.COM
Date: Thu, 07 Dec 95 08:59:49 EST
Subject: perm's and HTML with java
Can someone please show me how to pass a perm to a java applet from
HTML als o How to read the perm in to the java
------------------------------
From: "andrew (a.) francis" <andrewfr@bnr.ca>
Date: Thu, 7 Dec 1995 10:25:00 -0500
Subject: re:Threading Concepts
In message "Threading Concepts", you write:
> I don't know about anyone else but I find the hardest concept in Java to be
> threading. I'm fresh out of Seneca College (after my last final exam one
> week from today)
Congratulations! There is a real feeling of relief after taking that last
exam and/or handing in that last paper.
> thread-capable environment. I can understand the thread basics, but when I
> go to use them ... well, that's another story. I find it a sort of mental
> hurdle, one which I haven't gotten over yet. I was wondering if anyone else
> out there has the same problem?
> Is there a good source of information out there on the internet anywhere
> about threading; it doesn't even necessarily have to be in Java, although it
> would be nice if it was.
A good place to look is at is comp.programming.threads. Another good on-line
source is the Andrew Birrell's 1989 technical report "Introduction to
Programming with Threads (http://www.research.digital.com/SRC/research-reports/
abstracts/src-rr-035.html). Other sources I have used are the Sun Tutorial
to Lightweigh Processes that explained how the now obsolete Sun 4.x LWP
package worked. Also the Solaris Introduction to Threads (explains POSIX
1003a thread package) is useful. I also recall getting a USENIX paper on
Pthreads by Frank Mueller? at Florida State(?)
In terms of books, I have found Gregory Andrew's book "Concurrent Programming"
to be very helpful. Also I believe SunSoft is coming out with two books on
the subject, "Programming with Threads" and "Thread Primer: A Guide to
Multithreaded Programming."
Cheers,
Andrew
------------------------------
From: "Erik Knudson (924-7278 /*---------)" <eknudson@VNET.IBM.COM>
Date: Thu, 7 Dec 95 10:12:41 MST
Subject: Tabs
Does anyone know if there is a "Tab" class in the AWT similiar to what
Windows and OS/2 has for user interfaces? I think the AWT is pretty light
from what I've seen so far, I'm wondering if someone has created some more
sophisticated GUI classes/applets. Thanks in advance, Erik.
------------------------------
From: "Erik Knudson (924-7278 /*---------)" <eknudson@VNET.IBM.COM>
Date: Thu, 7 Dec 95 10:13:33 MST
Subject: AVI
Anyone know of Java applet wrappers for AVI files?
------------------------------
From: Jonathan_Mark_Smith@CCMAIL.PRUSEC.COM
Date: Thu, 07 Dec 95 12:45:37 EST
Subject: Replying to some message
Can someone please tell how to reply to the message I see here
------------------------------
From: jshermer@BASISinc.com (Jill Shermer)
Date: Thu, 7 Dec 1995 11:20:15 -0800
Subject: printing applets from browser
Hi,
I am interested in printing out an applet after it appears on
my Netscape 2.0 browser. I selected the Print button, under
Netscape's File menu, but the view of the applet is not captured
by the printer. Is it possible to print a view of an applet through an
existing java class?
- -Jill
------------------------------
From: Pat Niemeyer <pat@icon-stl.net>
Date: Thu, 7 Dec 1995 13:24:02 -0600 (CST)
Subject: Re: your mail
On Thu, 7 Dec 1995 Jonathan_Mark_Smith@CCMAIL.PRUSEC.COM wrote:
> While I play with applets, I like to place output strings throughout the
> code, just to make sure the applet reaches certain critical points.
> However, I'm never sure what the applet does as none of the debugging
> strings I use in the program ever show up (or rarely show up) -- I think
You might have to use System.out.println() ( as oppopsed to print() ) to
get it to flush the buffer properly. You might also try calling
System.out.flush() explicitly.
Pat
------------------------------
From: Michael Lorton <mlorton@eshop.com>
Date: Thu, 7 Dec 1995 12:51:15 -0800
Subject: re:Threading Concepts
> A good place to look is at is comp.programming.threads. Another good
> on-line source is the Andrew Birrell's 1989 technical report
> "Introduction to Programming with Threads
> (http://www.research.digital.com/SRC/research-reports/abstracts/src-rr-035.html).
I found it at
http://gatekeeper.dec.com/pub/DEC/SRC/research-reports/abstracts/src-rr-035.html
not at the above URL
M.
------------------------------
From: Jonathan_Mark_Smith@CCMAIL.PRUSEC.COM
Date: Thu, 07 Dec 95 08:51:10 EST
Subject: Help with Stand-alone and applet
Can someone show me how to use the same code for a stand-alone adn for
a applet.
Also how can I make the pgm tell which way it was started
------------------------------
From: "Edgar Valencia Figueroa." <edgar@tzetzal.dcaa.unam.mx>
Date: Thu, 7 Dec 1995 10:44:23 -0600 (CST)
Subject: HELP! Applet can't start!
Hi!!!
I am very *very* new in this list, so if this questions is too
obvious, sorry!!
I have my first java program, I can see it in the appletviewer,
but when I can view it in NetScape 2b3, show the follow:
Applet can't start: .....
I use the upgrade program, but it does the same!!
Thank you for your time!!
*********************************************************
* DIRECCION DE COMPUTO PARA LA ADMINISTRACION ACADEMICA *
* tzetzal.dcaa.unam.mx (132.248.27.10) *
* Ing. Edgar Valencia Figueroa *
* Coordinacion Tecnica 622-3675 622-3687 *
* http://tzetzal.dcaa.unam.mx/~edgar/edpres.html *
*********************************************************
------------------------------
From: ra104@cosc.bsu.umd.edu (Chris Gokey)
Date: Thu, 7 Dec 1995 12:25:08 -0500
Subject: help!
Help!
I'm new to this, so if anyone can help me I would truly appreciate it.
I am going through the hotjava tutorial on Writing an Applet. I created
in my home directory (unix) two directories html, classes. I put
the Hello.html program in the html directory and HelloWorld.java in the classes
directory. Then, I compiled the HelloWorld.java program. No problems
so far... Now, I want to run this and see the wonderful results.... I
am absolutely positive that everything is typed in correctly according to:
doc:///doc/appguide/StepByStep.html
But when I load Hello.html, it refuses to load the applet, it puts this
red block up in place of saying hello to me.....
There is one condition though in which it does work, at least sort of...
If I have both the html file AND the .class file in the same directory AND
I load hotjava in that directory, then the applet will load.... Great, but
why won't it work the way it is suppose to? Any why does it load only when
I load hotjava in the directory the html file and class file is located?
Its probably something simple, but what??? How can I start up hotjava in
any directory and specify the html file and it knows where to go to find the
class?
Thanks for any assistance you can offer,
Chris Gokey
------------------------------
End of java-interest-digest V1 #3
*********************************
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Info: send 'help' to java-interest-request@java.sun.com
