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abstract, any, as, assert boolean, break, byte, case, catch, char, class, continue, def, default, do, double, else, enum, extends, false, final, finally, float, for, if, import, in,[1] instanceof, int, interface, long, native, new, null, private, protected, public, return, short, static, strictfp, super, switch, synchronized, this, threadsafe, throw, throws, transient, true, try, void, volatile, while
[1] As in for (x in 0..9){}; however, in can still be used as an identifier, as in System.in.