[Computer-go] sgf reader/editor/write in java?

[Dave Dyer]

Read and Write is easy, I have some classes I use for all my games
that I've distributed several times.

Edit implies a full gui, which is a little more complicated.  I have
a fairly primitive board widget I've distributed in the past.

If your goal is a fully featured go gui, with replay and review
capabilities, you could start with Jago.

With about 10 minutes work, you could convert the "hex" board for
boardspace.net to a go board.   The advantage of this approach
is that you'd automatically have a pretty functional editing 
package.