My first Emacs GIFcast! I used byzanz and GIMP. In this GIF, you can see paredit is smart when you press semicolon. http://t.co/b4PwHzkf8U
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Paxedit is a nifty Emacs project that goes beyond paredit: https://github.com/promethial/paxedit/blob/master/readme.org
It understands e.g. (setf x 1 y 2), where you want to transpose pairs of expressions. It's also smart enough to allow you to operate on the sexp containing point, without you needing to move!
Both Java and Lisp really need an IDE: I wouldn't want to write Java without a decent .<tab> completion, and I wouldn't want to do a lisp without paredit.
It's funny considering how different the languages are. I suspect both have coevolved with their tooling.