How does client download Applet dependencies jar files?

I made an Applet which dependencies on several jar files. I think when client browser access this applet, it will download these dependencies. I want to know where these dependencies are located in client machine, will these dependencies are downloaded once. If so, how does the browser handle duplicated downloaded issue.
thanks.

It is no business of client code (read 'your applet') to know the location where it is downloaded. The browser will often cache the dependant Jar's, but that is up to the browser and its settings.
For more reliable caching, launch the applet using webstart (either embedded, in 1.6.0_10+ JRE, or free floating).

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