You want to optimize downloading time for an applet by putting all the class files into one JAR file.
jar the applet and supporting files.
Deploy the JAR file in place of the
class file on the web server. Use
Once you’ve deployed the JAR file on the web server in place of
the class file, you only need to refer to it in the
APPLET tag in the HTML. The syntax for
doing this is to use an
attribute on the APPLET tag.
You can also store other resources such as GIF images
for use by the applet. You then need to use
getResource( ) instead of trying to open the file directly; see Step 5
in Section 23.12.