I don’t use XCode if I can help it (no sir, don’t like it) so I spend most of my time in Eclipse. I find it a superior Java IDE for a number of reasons (build on the fly, code completion, no index, etc) and one of the biggest reasons for me is syntax checking. I find it saves me a ton of time, no need to build and wait for the syntax error before realizing I’ve missed a ";"

Kieren has posted an interesting tip that gives you access to some of this yumminess in XCode. Granted, it’s not as nice as Eclipse, but next time I’m forced to use XCode it’ll come in handy.