String[] () { if (myValues.size() > 0) { final Map<String, String> copy; if (myValues.get(null) != null) { copy = new HashMap<>(myValues); copy.remove(null); } else { copy = myValues; } return ArrayUtilRt.toStringArray(copy.keySet()); } else { return ArrayUtilRt.EMPTY_STRING_ARRAY; } }