Java Applets with AWT
Hi,
I have the problem to display the applet with AWT. If I am running the same applet in the internal server it works fine.If I am running through the web its giving Class not found exception.That web server also is mapped into the same server.
Here is the code.
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class NotHelloWorldApplet extends Applet
public void init()
try{
setLayout(null);
Label label1= new Label("Hello World!");
label1.setSize(200,200);
add(label1);
}catch(Exception e){System.out.println(e);}
<html><body>
<applet
code="NotHelloWorldApplet"
codebase="."
width=600 height=400
>
</applet>
</body></html>
can anyone help me please.
Thanks
Hello,
Even I executed the program. Its works fine. I guess you must be having problem with the codebase. Just change the address in the codebase from current directory to the address where the class file is there and also change the permissions(set attributes to 755) of the class file. Hope this helps you.
Regards,
Sarada.
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Problem Launching Java Applet with Plug-in: Version 1.4.2_01
Hello out there:
I recently installed j2re-1.4.2_01 on my home computer but have been unable to access Web sites emmploying JAva applets. The following is an email exchange with Jeff Hall of Lowell Observatory, manager of an educational site hosted by Lowell, trying to resolve my problem. The messages are better understood if read in reverse order.
I'm hoping that someone will recognize the source of my problem and can recommmend a solution. I would appreciate any help offered.
Thanks,
Mike Coucke
Hi Jeff:
Well, I guess the problem lies with me somewhere. Here's my answer/status to your questions/suggestions:
1) I'm using MS Windows Me version 4.90.3000
2) I do have the directory C:\Windows\.jpi_cache\jar\, but the only thing in it is an empty folder labeled "1.0". The file LP.jar does not exist anywhere on my hard drive.
3) I tried several game sites that utilized Java applets and got the same results: the Java cup in the upper left corner followed a few seconds later by the red "X". So, evidently the problem is somewhere on my end.
I'm going to post our email exchanges in a Java Users Forum managed by Sun to see if anyone out there can solve my problem. However, if you have any more suggestions, I'll be glad to try them.
Thanks for the help.
Mike Coucke
[email protected]
----- Original Message -----
From: "Jeffrey Hall" <[email protected]>
To: "'Mike Coucke'" <[email protected]>
Sent: Friday, September 05, 2003 1:02 PM
Subject: RE: Registration with Lowell Education Online
Mike,
Rats! What version of Windows are you using? It's a little strange to
see the user directory set to C:\Windows; if you're using XP, I'd expect
it to be something like C:\Documents and Settings\Mike Coucke. In any
event, the output that is of concern is these two lines:
java.lang.ClassNotFoundException: LPRemote.class
Caused by: java.net.UnknownHostException: proxy
It looks like your browser is not finding our server's IP when it comes
time to download the necessary Java code.
LPRemote.class is the fundamental code that runs LOPARC, and your
browser should be downloading it automatically when you click connect.
LPRemote.class is stored along with a bunch of other classes in a file
called "LP.jar" that you download from our server. So, if you go to C:
in Windows Explorer and do a file search for LP.jar, you should find it.
On my machine, it's stored in a directory called ".jpi_cache\jar\" in my
user home directory. Let me know if you have this file, or the
jpi-cache directory.
One other thing you might try is going to a different site that you know
uses Java applets -- I think some of the online game rooms at Yahoo use
Java. See if other sites that use Java load correctly. Then we'll know
if it's our server specifically, or a more general problem on your end.
Jeff Hall
Lowell Observatory
Hello Jeff:
I still have the Java "blues". I followed your instructions, but am still unable to launch a LOPARC session. After an initial failure, I uninstalled all three Java versions I had (1.4.0, 1.4.1, 1.4.2), then reinstalled 1.4.2_01 from the Sun website.
Now, when I try to launch LOPARC, I initially get a blank window with the Java cup in the upper left corner. After about 20 seconds, the cup changes to a red "X". During those 20 seconds, the following appear in the IE message bar at the bottom of the window: "Applet LPRemote notinited" (their spelling) which changes to "Loading Java Applet Failed..." when the red "X" appears.
Following is a copy of the log from my Java Console during all of this:
Java(TM) Plug-in: Version 1.4.2_01
Using JRE version 1.4.2_01 Java HotSpot(TM) Client VM
User home directory = C:\WINDOWS
Proxy Configuration: Manual Configuration
Proxy: http=proxy,https=proxy,ftp=proxy,gopher=proxy
Proxy Overrides:
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
load: class LPRemote.class not found.
java.lang.ClassNotFoundException: LPRemote.class
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.net.UnknownHostException: proxy
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.plugin.net.protocol.http.HttpClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.http.HttpClient.privilegedOpenServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.<init>(Unknown Source)
at sun.net.www.http.HttpClient.<init>(Unknown Source)
at sun.plugin.net.protocol.http.HttpClient.<init>(Unknown Source)
at sun.plugin.net.protocol.http.HttpClient.New(Unknown Source)
at sun.plugin.net.protocol.http.HttpURLConnection.createConnection(Unknown Source)
at sun.plugin.net.protocol.http.HttpURLConnection.connect(Unknown Source)
at sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.HttpURLConnection.getResponseCode(Unknown Source)
at sun.applet.AppletClassLoader.getBytes(Unknown Source)
at sun.applet.AppletClassLoader.access$100(Unknown Source)
at sun.applet.AppletClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 10 more
I followed this up by executing the following three console commands:
"dump system properties"
"dump classholder list"
"dump thread list"
and obtained the following listings:
Dump system properties ...
acl.read = +
acl.read.default =
acl.write = +
acl.write.default =
application.home = C:\PROGRA~1\JAVA\J2RE14~1.2_0
awt.toolkit = sun.awt.windows.WToolkit
browser = sun.plugin
browser.vendor = Sun Microsystems, Inc.
browser.version = 1.1
deployment.javaws.cache.dir = C:\WINDOWS\.javaws\cache
deployment.javaws.jre.0.enabled = true
deployment.javaws.jre.0.location = http://java.sun.com/products/autodl/j2se
deployment.javaws.jre.0.osarch = x86
deployment.javaws.jre.0.osname = Windows
deployment.javaws.jre.0.path = C:\Program Files\Java\j2re1.4.2_01\bin\javaw.exe
deployment.javaws.jre.0.platform = 1.4
deployment.javaws.jre.0.product = 1.4.2_01
deployment.javaws.jre.0.registered = true
deployment.javaws.version = javaws-1.4.2_01
deployment.system.cacerts = C:\PROGRA~1\JAVA\J2RE14~1.2_0\lib\security\cacerts
deployment.system.home = C:\WINDOWS\Sun\Java\Deployment
deployment.system.jssecacerts = C:\PROGRA~1\JAVA\J2RE14~1.2_0\lib\security\cacerts
deployment.system.profile = C:\WINDOWS
deployment.system.security.policy = file:/C:/WINDOWS/Sun/Java/Deployment/security/java.policy
deployment.user.cachedir = C:\WINDOWS\Application Data\Sun\Java\Deployment\cache
deployment.user.certs = C:\WINDOWS\Application Data\Sun\Java\Deployment\security\deployment.certs
deployment.user.extdir = C:\WINDOWS\Application Data\Sun\Java\Deployment\ext
deployment.user.home = C:\WINDOWS\Application Data\Sun\Java\Deployment
deployment.user.jssecerts = C:\WINDOWS\Application Data\Sun\Java\Deployment\security\deployment.jssecerts
deployment.user.logdir = C:\WINDOWS\Application Data\Sun\Java\Deployment\log
deployment.user.profile = C:\WINDOWS\Application Data
deployment.user.security.policy = file:/C:/WINDOWS/Application%20Data/Sun/Java/Deployment/security/java.policy
deployment.user.tmpdir = C:\WINDOWS\Application Data\Sun\Java\Deployment\cache\tmp
file.encoding = Cp1252
file.encoding.pkg = sun.io
file.separator = \
file.separator.applet = true
http.agent = Mozilla/4.0 (Windows Me 4.90)
http.auth.serializeRequests = true
https.protocols = SSLv3,SSLv2Hello
java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment
java.awt.printerjob = sun.awt.windows.WPrinterJob
java.class.path = C:\PROGRA~1\JAVA\J2RE14~1.2_0\classes
java.class.version = 48.0
java.class.version.applet = true
java.endorsed.dirs = C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\endorsed
java.ext.dirs = C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\ext
java.home = C:\PROGRA~1\JAVA\J2RE14~1.2_0
java.io.tmpdir = C:\WINDOWS\TEMP\
java.library.path = D:\PROGRAM FILES\INTERNET EXPLORER 6;.;C:\WINDOWS\SYSTEM;C:\WINDOWS;D:\PROGRA~1\INTERN~1;;C:\WINDOWS;C:\WINDOWS\COMMAND
java.protocol.handler.pkgs = sun.plugin.net.protocol|sun.plugin.net.protocol
java.runtime.name = Java(TM) 2 Runtime Environment, Standard Edition
java.runtime.version = 1.4.2_01-b06
java.specification.name = Java Platform API Specification
java.specification.vendor = Sun Microsystems Inc.
java.specification.version = 1.4
java.util.prefs.PreferencesFactory = java.util.prefs.WindowsPreferencesFactory
java.vendor = Sun Microsystems Inc.
java.vendor.applet = true
java.vendor.url = http://java.sun.com/
java.vendor.url.applet = true
java.vendor.url.bug = http://java.sun.com/cgi-bin/bugreport.cgi
java.version = 1.4.2_01
java.version.applet = true
java.vm.info = mixed mode
java.vm.name = Java HotSpot(TM) Client VM
java.vm.specification.name = Java Virtual Machine Specification
java.vm.specification.vendor = Sun Microsystems Inc.
java.vm.specification.version = 1.0
java.vm.vendor = Sun Microsystems Inc.
java.vm.version = 1.4.2_01-b06
javaplugin.maxHeapSize = 96m
javaplugin.nodotversion = 142_01
javaplugin.proxy.config.list = http=proxy,https=proxy,ftp=proxy,gopher=proxy
javaplugin.proxy.config.type = manual
javaplugin.version = 1.4.2_01
javaplugin.vm.options = -Djava.class.path=C:\PROGRA~1\JAVA\J2RE14~1.2_0\classes -Xbootclasspath/a:C:\PROGRA~1\JAVA\J2RE14~1.2_0\lib\plugin.jar -Xmx96m -Djavaplugin.maxHeapSize=96m -Xverify:remote -Djavaplugin.version=1.4.2_01 -Djavaplugin.nodotversion=142_01 -Dbrowser=sun.plugin -DtrustProxy=true -Dapplication.home=C:\PROGRA~1\JAVA\J2RE14~1.2_0 -Djava.protocol.handler.pkgs=sun.plugin.net.protocol
line.separator = \r\n
line.separator.applet = true
os.arch = x86
os.arch.applet = true
os.name = Windows Me
os.name.applet = true
os.version = 4.90
os.version.applet = true
package.restrict.access.netscape = false
package.restrict.access.sun = true
package.restrict.definition.java = true
package.restrict.definition.netscape = true
package.restrict.definition.sun = true
path.separator = ;
path.separator.applet = true
sun.arch.data.model = 32
sun.boot.class.path = C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\rt.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\i18n.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\sunrsasign.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\jsse.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\jce.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\charsets.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\classes;C:\PROGRA~1\JAVA\J2RE14~1.2_0\lib\plugin.jar
sun.boot.library.path = C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\bin
sun.cpu.endian = little
sun.cpu.isalist = pentium i486 i386
sun.io.unicode.encoding = UnicodeLittle
sun.java2d.fontpath =
sun.net.client.defaultConnectTimeout = 120000
sun.os.patch.level =
trustProxy = true
user.country = US
user.dir = C:\WINDOWS\Desktop
user.home = C:\WINDOWS
user.language = en
user.name = Michael G. Coucke
user.timezone =
user.variant =
Done.
Dump classloader list ...
codebase=http://kraken.lowell.edu/, key=http://kraken.lowell.edu/,IONJava/classes/ion_16.jar,IONJava/classes/LP.jar, zombie=false, cache=true, refcount=1, info=sun.plugin.ClassLoaderInfo@109de5b
Done.
Dump thread list ...
Group main,ac=11,agc=2,pri=10
main,5,alive
AWT-Windows,6,alive,dameon
AWT-Shutdown,5,alive
Java2D Disposer,10,alive,dameon
AWT-EventQueue-0,6,alive
Group Plugin Thread Group,ac=3,agc=0,pri=10
Main Console Writer,6,alive
AWT-EventQueue-1,6,alive
TimerQueue,5,alive,dameon
Group http://kraken.lowell.edu/-threadGroup,ac=2,agc=0,pri=4
thread applet-LPRemote.class,4,alive
AWT-EventQueue-2,4,alive
Done.
I'm not a Java expert, so this may be more information than you ever wanted to see.
Once again, I hope that you can help. My experience has been that I usually have some obscure option set incorrectly and that causes me great grief.
Thanks fo your help,
Mike Coucke
[email protected]
----- Original Message -----
From: "Jeffrey Hall" <[email protected]>
To: "'Mike Coucke'" <[email protected]>
Sent: Thursday, September 04, 2003 11:48 AM
Subject: RE: Registration with Lowell Education Online
Hi Mike,
Try it now. I think this problem has arisen because Sun just
released a new version of the Plug-in (1.4.2), and when we released the
public beta of LOPARC, only one relevant version (1.4.0) was available
and the LOPARC code was written to look for that by default. I have
just recoded the relevant routines so they should now cause your browser
to simply pick up the latest 1.4 version of the Plug-in you have
installed, whatever it is. I "broke" Java on my machine to replicate
your problem, and the code I inserted today did fix it. Hopefully it
will have the same effect for you. I am running IE 6 and plugin
1.4.2_01 (as accessed via Tools->Sun Java Console).
One broader problem: some (non-LOPARC-specific) users on the Sun
forums have reported the "JRE collision" you are seeing when multiple
versions of the Plug-in are installed on the same machine. So if the
fix I made to our code doesn't work, one option would be to uninstall
all Java components from your computer and do a fresh install of the
latest runtime environment.
Let me know how/if this works. Thanks for the feedback and for your
patience.
Best regards,
Jeff Hall
Lowell Observatory
-----Original Message-----
From: Mike Coucke [mailto:[email protected]]
Sent: Wednesday, September 03, 2003 6:30 PM
To: [email protected]
Subject: Re: Registration with Lowell Education Online
Hello Jeff:
So far, I have been unable to launch a LOPARC session. I repeatedly
get the following error message:
"Exception: java.lang.ClassNotFoundException: LPRemote.class"
My browser is MS Internet Explorer version 6.0.2800.1106 Initially I was
using Java Plug-In version 1.4.1 and received the error message. I went
to the Sun website and downloaded/installed Java Plug-In version 1.4.2
and still get the message.
Before I try to launch LOPARC, I can select Tools->Sun Java Console from
IE's pull down menu to check my Java Plug-In version. When I try to
launch LOPARC, I get the following message:
"Applet(s) in this HTML page requires a version of Java different from
the one the browser is currently using. In order to run the applet(s)
in this HTML page, a new browser session is required, press 'Yes' to
start a new browser session." If I select 'No', I get the following
message: "Java Plug-in detected JRE collission"
If I select 'Yes', a new browser window opens and then I get the first
message above.
Can you help?
Mike Coucke
[email protected]
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Monday, September 01, 2003 5:30 PM
Subject: Registration with Lowell Education Online
September 1, 2003
Dear Michael Coucke:
Thank you for registering with Lowell Observatory's online education
site. We hope you enjoy using it and visit regularly as we continue to
expand its features and capabilities. This is a one-time welcoming
email.
For your records, your user ID is xxxxx, and your password is #########.
You'll need to supply these each time you log in.
This site gives you access to research-grade equipment including a 16"
telescope, CCD detector, and image processing software. Our online
archive of data is now available 24/7. The telescope will be opening to
our onsite users in May, and on select nights to the Internet at large
in June.
We have designed this site so you don't need a huge monitor or a
supercomputer to use it. All pages are viewable on screens running at
800x600 resolution or higher. To use LOPARC, you'll need a Java-enabled
browser with the Java 1.4 plug-in installed. If you don't have the
plug-in, you'll be prompted to download it the first time you attempt to
connect. This is an admittedly large (9 MB) but one-time-only download.
This site works correctly under Internet Explorer version 5 or higher.
If you use Netscape, you must be running version 6 or higher, and
display or applet behavior anomalies may occur.
If at any time you can't connect to our server, simply try again later.
We do experience several power outages each year, particularly during
Flagstaff's summer thunderstorm season. Our server is fully protected
and backed up, and can be quickly brought back on line, but any active
user sessions will be lost. Thanks for your patience during these
inevitable downtimes.
Your questions, comments, suggestions, and bug reports about this site
are always welcome. On behalf of the LOPARC development team, thanks
for signing up!
Jeffrey Hall
Assistant Research Scientist
Associate Director, Education and Special Programs
Lowell Observatory
Flagstaff, ArizonaHi Mike,
I see this in your logs:
Java(TM) Plug-in: Version 1.4.2_01
Using JRE version 1.4.2_01 Java HotSpot(TM) Client VM
User home directory = C:\WINDOWS
Proxy Configuration: Manual Configuration
Proxy: http=proxy,https=proxy,ftp=proxy,gopher=proxy
Proxy Overrides:
I just helped my Dad set up his computer with a new
cable modem, and had the situation where we couldn't
access any secure Web sites. The cable folks had us
disable the proxy. It looks like the error message is
saying it can't find your proxy server, and the logs
you posted say that you've decided to configure your
proxy manually, rather than using the settings from
IE (which is how mine is set up in the plugin
control panel.)
Could that be the problem?
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I'm trying to run a Java applet with safari, but everytime I go to the webpage all I get is a grey box with a picture of a coffee cup that has two arrows circling it. Nothing loads after that. Any idea how to fix this?
Hi ad1054,
Are you sure you have java 1.6 and if so, how did you get it? I believe the latest version available from apple is 1.5.0_06. Java 1.6 was only just released by Sun, and, if I'm not mistaken, only for PC and Linux. Apple may be waiting to force people to pay for Leopard to get Java 1.6. (Though you can get a beta version from developer.apple.com.) As Hawaiian_Starman mentioned above, you can check your java version.
That said, you don't have to worry about lower versions of Java because Java is backwards compatible. In fact, if you use Firefox (sorry, but I just checked it in Safari, and got a blank page so I guess Safari, like IE, doesn't support this) and go to "about:plugins" you will see something like
<pre>
Java Embedding Plugin 0.9.5g2
File name: MRJPlugin.plugin
Runs Java applets using the latest installed versions of Java. For more information: Java Embedding Plugin. Run version test: Test Your JVM.
MIME Type Description Suffixes Enabled
application/x-java-vm Embedded JVM xjv Yes
application/x-java-applet Embedded Java Applet xja Yes
application/x-java-applet;version=1.1 Embedded Java Applet xja11 Yes
application/x-java-applet;version=1.1.1 Embedded Java Applet xja111 Yes
application/x-java-applet;version=1.1.2 Embedded Java Applet xja112 Yes
application/x-java-applet;version=1.1.3 Embedded Java Applet xja113 Yes
application/x-java-applet;version=1.2 Embedded Java Applet xja12 Yes
application/x-java-applet;version=1.2.1 Embedded Java Applet xja121 Yes
application/x-java-applet;version=1.2.2 Embedded Java Applet xja122 Yes
application/x-java-applet;version=1.3 Embedded Java Applet xja13 Yes
application/x-java-applet;version=1.3.1 Embedded Java Applet xja131 Yes
application/x-java-applet;version=1.4 Embedded Java Applet xja14 Yes
application/x-java-applet;version=1.4.1 Embedded Java Applet xja141 Yes
application/x-java-applet;version=1.4.2 Embedded Java Applet xja142 Yes
application/x-java-applet;version=1.5 Embedded Java Applet xja15 Yes
</pre>
You can see from this list that all versions up to and including the currently installed one are supported. The only thing you have to fear is that the applet you are trying to use was compiled with Java 1.6 and is not itself backwards compatible. However, when I made a test applet of this type, I got a red X, and no coffee cup.
If you see the red X, and I think the coffee cup as well, you should be able to right-click (or ctrl-click) the icon. If so, this will give you a menu with "console" and "about" choices. "About" will give you the version of Java you have, and "console" is supposed to show you the errors that kept the applet from working. (However, with my Java 1.6 test, the console was empty.)
I hope this helps.
1.5GB, 2.16 GHz Core Duo, 15.4" Macbook Pro Mac OS X (10.4.8) -
Hi friends
I have an html form with an editable textfield on it. Next to it is an Java Applet with an Button on it. If you klick the button, a Popup aperars where the textfield can be modified. There is also an OK Button on this Popup. If you klick the Button, I want that the value of my string will be plased into the html form.
If anyone knows how that works. Please help me.
thanks kendimanSweet, I was wondering how to do that.
So if one was to design a menu using java, the external Java Script can access the public variables within the applets?
So if we had
public class applet extends Applet {
public int test;
public applet() {
test = 6;
}then the javascript command
document.applet.test
would return a 6?
Do I have this correctly?
Dale M -
Java Applet (Masking/Scrollbar)
hi ppl out there.. i've some difficulties in my project.. can u all help me?
i need to create a java applet, with a scrollbar.. <-- this i know..
but how to create a image overlapping an image? what i mean here is that i have a image (A) appearing now.. i need to have another image(B) to be on top of it.. den when i click/drag the scrollbar, the image(B) will move alittle, showing abit of image(A).. it is like masking type.. can some kind soul share with me the source code??i need to create a java applet, with a scrollbar.. <-- this i know..Why not use a JSlider?
i have a image (A) appearing now.. i need to have another image(B) to be on top of it.. You can add a JPanel to your JApplet's content pane. You'll need to create your own class that extends JPanel. By creating your own class, you can override the paintComponent() method, which is where drawing on a component takes place. paintComponent() is called automatically when the component is first displayed, and when you call repaint() on the component. You can create the JPanel and add it to your JApplet inside init().
Inside paintComponent(), you can draw the second image on top of the first image doing this:
public void paintComponent(Graphics g)
super.paintComponent(g);
g.drawImage(img1, 0, 0, this); //first image
g.drawImage(img2, 0, 0, this); //second image
}img1 and img2 must be objects of type Image. In a JApplet, you can create Image objects from a file name like this:
URL pic1 = new URL(getCodeBase(), "yourPic.jpg"); //.jpg file is in same directory as applet's .class file
Image img1 = getImage(pic1);
but how to create a image overlapping an image?If you want to move the second image over 10 pixels so that the two images are overlapping, you can do this:
g.drawImage(img2, 10, 0, this); //x coordinate was changed from 0 to 10
den when i click/drag the scrollbar, the image(B) will move alittle, showing abit of image(A)..You can also add a JSlider to your JApplet. A JSlider will fire a ChangeEvent event when it is moved. You can register your JPanel to listen for that event. Once your JPanel is registered for that event, the JSlider will call a stateChanged() method inside your JPanel class, which you can define to perform the tasks you want.
If you add a member variable to your JPanel class, like
int img2x; //x coordinate of 2nd imageYou can read that value inside the JPanel's paintComponent() method:
g.drawImage(img2, img2x, 0, this); //x coordinate was changed from 0 to 10If you set img2x to 0 in the JPanel's constructor, then when your JPanel is first displayed, the second image will be on top of the first image. When the user moves the slider, the stateChanged() method that you define in your JPanel class will be called. Inside stateChanged(), you can get the value of the slider; and then set img2x to that value; and then call repaint() on your JPanel. Calling repaint() on your JPanel will cause paintComponent() to be called, which will read the new value for img2x, which will cause the second image to move to the new coordinates and reveal part of the first image.
See here for more information on how to use a JSlider:
http://java.sun.com/docs/books/tutorial/uiswing/components/slider.html -
I was wondering if there is anyway to remedy this situation:
I am using TextPad to write my java code/html code. when i send my HTML code to Internet Explorer to view my applet, it takes several seconds to load. Even while looking at other java applets, it takes a while. Is there anything I can do to speed that up?
dm0caYeah....thats not much help.
I have a slower comp that can run java applets with no lag.
Anyone else have a solution?
dm0ca -
I want to start a Java applet with this one JAR file I have. What is the code I need to put into the HTML to initiate the applet. I have this so far, but I don't know the class required:
<applet code = "whatclassdoineedhere.class"
archive = "file.jar"
width=256 height=256>
</applet>
I am wondering what class I need to get it running. I'm completely new to Java, and am just experimenting with some things.Let me know if it doesn't work, by the way, I suggest you to use the Object Tag like this, it makes the user behind the internet terminal, know if it has the Java Plug-in; if not, it tries to install it, like when using flash.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML>
<HEAD>
<TITLE>MyAppletSigned</TITLE>
</HEAD>
<BODY topmargin='0' leftmargin='0' rightmargin='0' bottommargin='0' BGCOLOR='black'>
<OBJECT classid='clsid:8AD9C840-044E-11D1-B3E9-00805F499D93'
codebase='http://java.sun.com/products/plugin/autodl/jinstall-1_4-windows-i586.cab#Version=1,4,0,0'
width='100%'
height='95%'>
<PARAM name='code' value='MyApplet.class'>
<PARAM name='codebase' value=''>
<PARAM name='archive' value='MyJar.jar'>
<PARAM name='type' value='application/x-java-applet;version=1.4'>
<PARAM name='scriptable' value='false'>
<COMMENT>
<EMBED type='application/x-java-applet;jpi-version=1.4'
width='100%'
height='95%'
code='MyApplet.class'
codebase=''
archive='MyJar.jar'
scriptable='false'
pluginspage='http://java.sun.com/j2se/1.4/index.html'>
<NOEMBED>
</NOEMBED>
</EMBED>
</COMMENT>
<P>
You don't have Java 2 SDK, Standard Edition v 1.4
</OBJECT>
</BODY>
</HTML> -
Hi....i m using Mac OS x 10.5.8 with safari Version 5.0.2 (5533.18.5). I just updated the Java version to Java 6 and now m getting below error:
This page contains content of “application/x-java-applet” type. You do not have the plug-in required to view this content.
Please help me out on this....I am also having a problem with this. My website is hosted through "www.onlinepictureproof.com" and now that my laptop is back from repair with OS X 10.6.8 I am unable to upload my photos to my work website. It says "a plug-in is needed to display this content. Install plug-in" and then a window pops up that says "no suitable plug-ins were found". Below that is "unknown plug-in (application/x-java-applet)" with a link to "manual install" which takes me to "http://www.oracle.com/technetwork/java/index-jsp-141438.html#download" which just leaves me lost. I've tried downloading the "JRE" but I have zero idea what that means or if Im downloading the proper thing. Once I click on the "download JRE" it brings me to a download page where there are WAY too many items for me to choose from to download, when I have no idea what I need or why I need it. please help, this is driving me insane. I actually preferred my constantly crashing laptop to the state its in now, "like brand new" back from apple repair...I have already updated everything that is promted through "Software Updates".
"OnlinePictureProof.com" only directs me to apple support.
Thank you for any help you can offer!
Sheila
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