Run code, watch movie.


import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.ListView;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class JavaApplication39 extends Application {

    public static void main(String[] args) {
        launch(args);
    }
    ChoiceBox cb;
    ListView objectList;

    @Override
    public void start(Stage stage) throws Exception {
        cb = new ChoiceBox();

        cb.getItems().add("1");
        cb.getItems().add(3);
        cb.getItems().add(false);
        cb.setConverter(null);

        VBox vb = new VBox();
        vb.getChildren().add(cb);

        Scene scene = new Scene(vb, 300, 300);
        stage.setScene(scene);
        stage.show();

        cb.getItems().clear();
        cb.getItems().add("1");
        cb.getItems().add(3);
        cb.getItems().add(false);
        cb.setConverter(null);
    }
}