How to use URL class to execute a java class/app on a remote machine?

I am a beginner in Java networking and have a question about URL programming.
How do I pass parameters to a java class/application over the web and then cause it to execute ? I then want to get the result back from the clas/app. The class/app resides on a remote machine and the protocol used is "http" protocol. OR all this is not possible through the URL and related classes ?

How do I pass parameters to a java class/application over the web and then cause it to execute ? Using the HTTP protocl you can either perform a GET where the parameters are in the URL or a POST where the data is sent to the server with the request.
The server must be setup as a web server to execute code based ojn a HTTP request. Using a web server with a JSP which contains the code to execute is the simplest way to do this.
I then want to get the result back from the clas/app. The output of the JSP becomes in the data returned by the HTTP request.
I would suggest looking for example on google.
http://www.google.co.uk/search?q=java+http+request+tutorial
Another option is to use RMI. The integration is tighter but it does not use the HTTP protocol.

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