Some Commands to Get You Started

Emacs commands are notated with C-x and M-x, where C is the control key, and M is the alt key. So, C-x means hold down control and tap x. C-x C-v means hold down on control and tap x, then tap v while still holding control down. C-x k means hold down on control, tap x, let go of control, then hit k.

Files:

To open a file: C-x C-f
To save a file: C-x C-s
To close a file: C-x k
To switch to split windows: C-x 2
To switch to one big window: C-x 1

Java:

To compile: C-c C-v C-c
To run: C-c C-v C-r

The rest of the commands can be found both in the Emacs help - just go into "Browse Manuals with Info" under the help menu. JDE java commands can be found in the JDE user's guide (in your JDE directory).