I’m writing some Java2D code, and I notice that IDEA (my code editor) highlighted parts of my code:

Check out the caption at the bottom of the window. It turns out (as any good Java2D programmer knows) I’m reversing the width and height arguments — but how did IDEA know? Whether its lexical analysis or a special case built into the tool, wow! This kind of stuff is infinitely useful.

(cross-posted on Married... with Children, my personal blog)