ok ho risolto :-) thank you!!
codice:class MyActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { if(list.getSelectedIndex() == 0) System.out.println("Riga 1"); else if(list.getSelectedIndex() == 1) System.out.println("Riga 2"); else if(list.getSelectedIndex() == 2) System.out.println("Riga 3"); else if(list.isSelectionEmpty()) System.out.println("Nessuna selezione"); } }