return msgType.length() >= 1 && "0A12345".indexOf(msgType.charAt(0)) != -1;
return msgType.length() == 1 && "0A12345".indexOf(msgType.charAt(0)) != -1;
    public boolean isAdmin() {        if (header.isSetField(MsgType.FIELD)) {            try {                String msgType = header.getString(MsgType.FIELD);                return msgType.length() >= 1 && "0A12345".indexOf(msgType.charAt(0)) != -1;            } catch (FieldNotFound e) {                // shouldn't happen            }        }        return false;    }