This code is ugly anyway: private static void rangeCheck(int arrayLen, int fromIndex, int toIndex { if (fromIndex > toIndex) throw n

This code is ugly anyway: private static void rangeCheck(int arrayLen, int fromIndex, int toIndex { if (fromIndex > toIndex) throw new IllegalArgumentException("fromIndex(" + fromIndex + ") > toIndex(" + toIndex+")"); if (fromIndex < 0) throw new ArrayIndexOutOfBoundsException(fromIndex); if (toIndex > arrayLen) throw new ArrayIndexOutOfBoundsException(toIndex); } Missing a closing paren in the function prototype, among other things. private static void rangeCheck(int arrayLen, int fromIndex, int toIndex) { if (fromIndex > toIndex) { throw new IllegalArgumentException( String.format("fromIndex(%d) > toIndex(%d)", fromIndex, toIndex) ); } if (fromIndex < 0) { throw new ArrayIndexOutOfBoundsException(fromIndex); } if (toIndex > arrayLen) { throw new ArrayIndexOutOfBoundsException(toIndex); } } There you go Google, Oracle, et al. I release this snippet under MIT / WTFPL / CC0. You're welcome.