Keyword (kata kunci) adalah identifier yang digunakan dalam Java untk suatu tujuan khusus. Daftar keyword Java sebagai berikut:
abstract, Boolean, Break, Byte, byvalue, Case, Catch, Char, Class, Const, continue, default, Do, double, else, extends, false, final, finally, float, for, goto, if, implements, import, instanceof, In, Interface, Long, Native, New, Null, Package, private,protected, public, return, short, static, Super, Switch, synchronized, This, threadsafe, throwm Transient, True, Try, Void, while.