Using gwt to change java files

I am really new to gwt but I have already posted a question and I
don't really understand.

I am working on a project that had already been developed. This
project uses get and the javascript comes from java files. I wanted to
make some changes on one of these java files. SO I was told I needed
to download get. This is what I did.

But my php and html files are processed with MAMP.

So now, how do I change the java files ? Where do I put my php and
html files to run it on my local server MAMP ? Am I supposed to take
the only java files, opening a "WebApp" (as indicated in the get doc),
runn it (with an ant build command ?), retrieving some files and put
those in my MAMP workspace ?

(I have read the gwt, but I didn't really understand it. I apologize
by advance if my question seems too simple)

Thanks, Mehdi

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