Write a reader macro that treats all [ ], { } and < > as if they were ( ), and the only thing they'll notice is that there's less parens/brackets than there should be in regular Java code...
There have been efforts to do something similar to create more "readable" S-expressions. I did work in Common Lisp for a number of years and didn't have any issues with the syntax but I rather like this idea:
http://readable.sourceforge.net/