returns the nickname associated with the roster item . concode_field_sep String CHANGE_USERNAME concode_elem_sep String INSERT_ROSTER_ITEM concode_elem_sep String SET_GROUPS concode_elem_sep long registrationID concode_elem_sep String nickname concode_elem_sep List<String> groups concode_elem_sep String REMOVE_ROSTER_ITEM concode_elem_sep String LOAD_ROSTER_ITEM concode_elem_sep Logger Log concode_elem_sep String SET_NICKNAME concode_elem_sep String username concode_field_sep void changeUsername concode_elem_sep void loadFromDb concode_elem_sep void setNickname concode_elem_sep void insertIntoDb concode_elem_sep void removeFromDb concode_elem_sep String toString concode_elem_sep void setGroups concode_elem_sep void delete concode_elem_sep long getRegistrationID concode_elem_sep List<String> getGroups concode_elem_sep String getUsername
String function ( ) { return nickname ; }