question: public String redo ( ) { if ( ! canRedo ( ) ) { return "" ; } m_nCurrentEditAction ++ ; UndoAction undoAction = m_undoStack . get ( m_nCurrentEditAction ) ; m_bNeedsUndoAction = false ; undoAction . redo ( ) ; m_bNeedsUndoAction = true ; return undoAction . getRedoMsg ( ) ; }
target:  redo the last edit action performed on the network. returns message representing the action performed.