Tree sources

[Vladimir Bezugliy]

Where can I see source of the not Sun's implementation of the tree?
Or where can I read about trees?

[Jeroen Wenting]

http://www.bbc.co.uk/dna/h2g2/A2346400 the world's most dangerous tree.
http://www.bbc.co.uk/dna/h2g2/A284492 the tree and its uses

[Joel McNary]

For information on JTree, check out Sun's JTree tutorial. I'm not sure what you mean by "not SUN's" implementation; could you be more specific? There are plenty of trees out there that are "not SUN's" -- Jeroen pointed out a couple.