code: public static String[] getAvailableIDs(int rawOffset) {
          Set<String> ids = getAvailableIDs(SystemTimeZoneType.ANY, null, Integer.valueOf(rawOffset));
          return ids.toArray(new String[0]);
      }
docs: Return a new String array containing all system TimeZone IDs
  with the given raw offset from GMT.  These IDs may be passed to
  <code>get()</code> to construct the corresponding TimeZone
  object.
  @param rawOffset the offset in milliseconds from GMT
  @return an array of IDs for system TimeZones with the given
  raw offset.  If there are none, return a zero-length array.
  @see #getAvailableIDs(SystemTimeZoneType, String, Integer)