ListController.java

public class ListController {
    @FXML
       ListView<Song> listView;

       private ObservableList<Song> obsList;

       public void start(Stage mainStage) throws Exception{
          // create an ObservableList
          // from an ArrayList
           ArrayList<Song> al = new ArrayList<Song>();
           al.add(new Song("Jesus of Suburbia", "Greenday"));
          obsList = FXCollections.observableArrayList(al);

          SortedList<Song> sl = new SortedList<Song>(obsList, new Song.Compare());
          listView.setItems(sl);
          obsList.add(new Song("Birdplane", "Axis of Awesome"));

          // select the first item
          listView.getSelectionModel().select(0);

          // set listener for the items
          listView
          .getSelectionModel()
          .selectedItemProperty()
          .addListener(
                  (obs, oldVal, newVal) ->
                  showItem(mainStage));

       }

       private void showItem(Stage mainStage) {
           Alert alert =
                   new Alert(AlertType.INFORMATION);


           alert.initOwner(mainStage);
           alert.setTitle("List Item");
           alert.setHeaderText(
                   "Selected list item properties");

           String content = "Index: " +
                   listView.getSelectionModel()
           .getSelectedIndex(); // +
//         "\nValue: " +
//         listView.getSelectionModel()
//         .getSelectedItem();



           alert.setContentText(content);
           alert.showAndWait();
       }


}