There's a free Java interpreter available for Amiga: kaffe.
I've used it on my A1200/030 when I was studing the language, and for basic stuff like outputting text it works well, it's enough for beginners. I've read in some older post here that kaffe under linux on the same setup is 4 times faster, because of ixemul.library slowing down the interpreter, so if you want more speed I would recommend running it under linux.
Varthall
