static {
   OPTION_TYPES
       .put(DEFAULT_OPTION, "DEFAULT_OPTION")
       .put(YES_NO_OPTION, "YES_NO_OPTION")
       .put(YES_NO_CANCEL_OPTION, "YES_NO_CANCEL_OPTION")
       .put(QUESTION_MESSAGE, "QUESTION_MESSAGE")
       .put(OK_CANCEL_OPTION, "OK_CANCEL_OPTION");
 }
 static {
   MESSAGE_TYPES
       .put(ERROR_MESSAGE, "ERROR_MESSAGE")
       .put(INFORMATION_MESSAGE, "INFORMATION_MESSAGE")
       .put(WARNING_MESSAGE, "WARNING_MESSAGE")
       .put(QUESTION_MESSAGE, "QUESTION_MESSAGE")
       .put(PLAIN_MESSAGE, "PLAIN_MESSAGE");
 }