Except that you can't import a class using "using" or "import", so you have to write Math.cos() everywhere.
EDIT: I see below that Java has added "import static", but at that point you're in the situation where you have two things that are almost the same but not quite, which is not a particularly clean design in my opinion.
EDIT: I see below that Java has added "import static", but at that point you're in the situation where you have two things that are almost the same but not quite, which is not a particularly clean design in my opinion.