question: public void addAction ( String action ) { Object [ ] args = new String [ 1 ] ; SimpleDateFormat sdf = new SimpleDateFormat ( context . getString ( R . string . dateFormat ) ) ; args [ 0 ] = sdf . format ( new Date ( ) ) ; String timestamp = context . getString ( R . string . timestamp , args ) ; history . add ( action + timestamp ) ; notifyListeners ( new PropertyChangeEvent ( this , Constants . historyProperty , null , null ) ) ; }
target:  Add an action to the history of the client