Java on a Mac

[logan2]

I am new to Java and am having a problem compiling the code that I write.
I write my code in 'xcode', but then I don't know what my next step is. Can someone assist me in what I do next, or where my compiler is located?
Thanks

[destin]

Click on the "Build and Go" button.

[logan2]

Right, but there must be something more. No matter what code I write when I click "build and go" what comes up is "Hello World....Succesful". When I create new code I always delete what is already on the stage, should I not delete everything, should I be writing within the code that is already there?
TX