Applets

while since I ve done applets but I do remember running across a similar problem.

Q: In my applet I have a bunch of gif s in my JAR file. When I try to access a gif using:

Image img = getImage(getCodeBase(), "image.gif");

everything works fine under Microsoft Internet Explorer but it does not under Netscape and

appletviewer. Of course I do not have any gifs in my CodeBase directory on server.

Any idea why?????

Answer:  Because this is not how you access resources in a Jar file. You need to use

getResourceAsStream if you want to access GIFs from Netscape. Look at:

http://developer.iplanet.com/docs/technote/java/getresource/getresource.html

for example code. This same code will work in Sun s Appletviewer.

David Risner

http://david.risner.org/

 Q: How do I get JVM version in Internet Explorer?

Q: When you open the Java Console through internet explorer, it prints the following useful line at the

top:

Microsoft (R) VM for Java, 5.0 Release 5.0.0.3318

We would like to be able to obtain the above String (or atleast the 5.0.0.3318 part of it) through a Java

Applet / Javascript at runtime. 

Does anyone know of any handy methods that allow access to this String ? I ve looked in all the

System.properties, but it wasn t there. Is it stored in the user s registry anywhere ?

Answer: just for Microsoft t VM!

try :

class test{

   public static void main(String[] args){

      String build;

      build=com.ms.util.SystemVersionManager.getVMVersion().getProperty ("BuildIncrement");

      System.out.println("Using build "+build);

   }

}

Real Gagnon from Quebec, Canada

* Looking for code code snippets ? Visit Real s How to 

* http://www.rgagnon.com/howto.html

 Q: I wonder if there is a way to find out if a button in an applet has been clicked, no matter which

of the buttons in an applet it might be.

Of course I can write, with a particular button (if event.target==button1) but maybe there is a syntax

that looks more or less like this (it is an imaginary code just to show what I would like to do)

(if.event.target.ComponentType==Button) etc.

I tried a lot of things with getClass but none of them worked

Answer: Have your applet implement the ActionListener interface, and have every button that s

instantiated add the applet as an ActionListener. Then, inside of your applet, have the following

method:

file:///F|/a_jsite/350_tips/applets.htm (5 of 9) [2001 07 08 11:24:47]