http://www.macnn.com/articles/01/05/07/codeguide.3.0/
CodeGuide 3.0 Preview for Mac OS X
updated 11:25 am EDT, Mon May 7, 2001
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CodeGuide 3.0 Preview Release for Mac OS X is a professional code-centric Java IDE that "analyses your programs as you type, shows you errors instantly, and gives you powerful programming assistance." This preview release is fully functional and allow users to code and debug Java applications for the JDK 1.3 provided with Mac OS X, but does not offer the Aqua look and feel. [form]
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JBuilder
I'm using IBM's VisualAge for Java (under Linux) at my work.
It has similar features (checks while you type and automatic completion, really really great).
The standard developer tools (from Apple) don't have this functionality, leaving you to specifically build and manually indenting your code. Once you've done it automatically you won't switch back!
I heard Borland's JBuilder (free download) also packs those features. At MacWorld in january Borland was demo-ing JBuilder for OSX. I really really really hope they will release it soon (WWDC anybody?).