code: public static String[] getAvailableIDs(String country) {
          Set<String> ids = getAvailableIDs(SystemTimeZoneType.ANY, country, null);
          return ids.toArray(new String[0]);
      }
docs: Return a new String array containing all system TimeZone IDs
  associated with the given country.  These IDs may be passed to
  <code>get()</code> to construct the corresponding TimeZone
  object.
  @param country a two-letter ISO 3166 country code, or <code>null</code>
  to return zones not associated with any country
  @return an array of IDs for system TimeZones in the given
  country.  If there are none, return a zero-length array.
  @see #getAvailableIDs(SystemTimeZoneType, String, Integer)