The ListView content is backed up by an ObservableList and any changes to this list are automatically reflected in the ListView, as in the button handler in the next example:
// chaptep10/list/ListViewDemo.javaObservableList<String> items = FXCollections.observableArrayList( "Red", "Blue", "Yellow", "Green");ListView<String> list = new ListView<>(items);Button btn = new Button("Add New Item");btn.setOnAction((e) -> { items.add( // just a way to generate semirandom new items items.get(new Random().nextInt(items.size())) );});