JavaFX 8 TableView未從ObservableList（無FXML）填充

Question

我相信我已經搜索了所有類似的問題，但仍然沒有在任何地方看到我的問題。我正在根據控制檯輸出成功填充數據庫中的ObservableList。我有一個學校項目的多控制器設置來創建一個調度程序的應用程序。我有一個作爲borderPane的根控制器，Appointments和Customers的兩個函數控制器都是Singleton，還有一個共享的DataView控制器，它不允許每個視圖實例化它自己的DataView。我已經在每個控制器上實現toString，以便吐出每個元素的值和/或對象ID，並且所有內容似乎都是一致的。我不能爲我的生活找出爲什麼ListView或TableView不輸出綁定數據。下面是我試圖綁定到兩個ListView和TableView

public class AppointmentView implements IAppointmentView { 
    private final ZonedDateTime createdDate; 
    private final String createdBy; 
    // Interface needs these components 
    private ReadOnlyStringProperty title; 
    private ReadOnlyStringProperty description; 
    private ReadOnlyStringProperty location; 
    private ReadOnlyStringProperty contact; 
    private ReadOnlyStringProperty url; 
    private ReadOnlyStringProperty customerName; 
    private ReadOnlyObjectProperty<ZonedDateTime> start; 
    private ReadOnlyObjectProperty<ZonedDateTime> end; 
    private ReadOnlyProperty<ZonedDateTime> lastUpdated; 

    /*** 
    * 
    * @param title 
    * @param description 
    * @param location 
    * @param contact 
    * @param url 
    * @param customerName 
    * @param start 
    * @param end 
    * @param createDate 
    * @param createdBy 
    * @param lastUpdate 
    */ 
    public AppointmentView(String title, String description, String location, String contact, String url, String customerName, Timestamp start, Timestamp end, Timestamp createDate, String createdBy, Timestamp lastUpdate) { 
     this.title = new SimpleStringProperty(title); 
     this.description = new SimpleStringProperty(description); 
     this.location = new SimpleStringProperty(location); 
     this.contact = new SimpleStringProperty(contact); 
     this.customerName = new SimpleStringProperty(customerName); 
     this.start = new SimpleObjectProperty<>(ZonedDateTime.ofInstant(start.toInstant(), ZoneId.systemDefault())); 
     this.end = new SimpleObjectProperty<>(ZonedDateTime.ofInstant(end.toInstant(), ZoneId.systemDefault())); 
     this.lastUpdated = new SimpleObjectProperty<>(ZonedDateTime.ofInstant(lastUpdate.toInstant(), ZoneId.systemDefault())); 
     this.url = new SimpleStringProperty(url); 
     this.createdDate = ZonedDateTime.ofInstant(createDate.toInstant(), ZoneId.systemDefault()); 
     this.createdBy = createdBy; 

    } 

    public String getTitle() { 
     return title.getValue(); 
    } 

    ReadOnlyStringProperty titleProperty() { 
     return title; 
    } 

    public String getDescription() { 
     return description.getValue(); 
    } 

    ReadOnlyStringProperty descriptionProperty() { 
     return description; 
    } 

    public String getLocation() { 
     return location.getValue(); 
    } 

    ReadOnlyStringProperty locationProperty() { 
     return location; 
    } 

    public String getContact() { 
     return contact.getValue(); 
    } 

    ReadOnlyStringProperty contactProperty() { 
     return contact; 
    } 

    public String getUrl() { 
     return url.getValueSafe(); 
    } 

    ReadOnlyStringProperty urlProperty() { 
     return url; 
    } 

    public String getCustomerName() { 
     return customerName.getValue(); 
    } 

    ReadOnlyStringProperty customerNameProperty() { 
     return customerName; 
    } 

    public ZonedDateTime getStart() { 
     return ZonedDateTime.ofInstant(start.getValue().toInstant(), ZoneId.systemDefault()); 
    } 

    ReadOnlyProperty<ZonedDateTime> startProperty() { 
     return start; 
    } 

    public ZonedDateTime getEnd() { 
     return ZonedDateTime.ofInstant(end.getValue().toInstant(), ZoneId.systemDefault()); 
    } 

    ReadOnlyProperty<ZonedDateTime> endProperty() { 
     return end; 
    } 

    public LocalDate getCreateDate() { 
     return createdDate.toLocalDate(); 
    } 

    public String getCreatedBy() { 
     return createdBy; 
    } 

    public ZonedDateTime getLastUpdate() { 
     return ZonedDateTime.ofInstant(lastUpdated.getValue().toInstant(), ZoneId.systemDefault()); 
    } 

    ReadOnlyProperty<ZonedDateTime> lastUpdatedProperty() { 
     return lastUpdated; 
    } 

    @Override 
    public String toString() { 
     final StringBuffer sb = new StringBuffer("AppointmentView{"); 
     sb.append("createdDate=").append(createdDate); 
     sb.append(", createdBy='").append(createdBy).append('\''); 
     sb.append(", titleProperty=").append(title); 
     sb.append(", descriptionProperty=").append(description); 
     sb.append(", locationProperty=").append(location); 
     sb.append(", contactProperty=").append(contact); 
     sb.append(", urlProperty=").append(url); 
     sb.append(", customerName=").append(customerName); 
     sb.append(", startProperty=").append(start); 
     sb.append(", endProperty=").append(end); 
     sb.append(", lastUpdated=").append(lastUpdated); 
     sb.append('}'); 
     return sb.toString(); 
    } 
} 

這裏查看數據的The AppViewController：

public class AppViewController extends BorderPane { 


    private BorderPane rootPane; 
    private MenuBar menuBar; 
    private Menu fileMenu; 
    private Menu editMenu; 
    private Menu reportMenu; 
    private Menu helpMenu; 
    private MenuItem closeMenuItem; 
    private MenuItem copyMenuItem; 
    private MenuItem monthlyAppointmentReportMenuItem; 
    private MenuItem consultantScheduleMenuItem; 
    private MenuItem customersByCountryMenuItem; 
    private MenuItem aboutMenuItem; 
    private VBox vbAppView; 
    private TabPane tpAppPane; 
    private Tab tabCustomers; 
    private ScrollPane spCustomerEditor; 
    private Tab tabAppointments; 
    private ScrollPane spAppointmentEditor; 
    private MainApp mainApp; 
    private static AppViewController instance; 
    private static AppointmentViewController appointmentViewController = AppointmentViewController.getInstance(); 
    private static CustomerViewController customerViewController = CustomerViewController.getInstance(); 
    private static DataViewController dataViewController; 

    private AppViewController() { 
     initialize(); 
    } 

    public static AppViewController getInstance() { 
     if (instance == null) { 
      new AppViewController(); 
     } 
     return instance; 
    } 

    /** 
    * Called to initialize a controller after its root element has been 
    * completely processed. 
    **/ 

    public void initialize() { 
     instance = this; 
     this.rootPane = new BorderPane(); 
     this.menuBar = new MenuBar(); 
     this.fileMenu = new Menu("_File"); 
     this.editMenu = new Menu("_Edit"); 
     this.reportMenu = new Menu("_Report"); 
     this.helpMenu = new Menu("_Help"); 
     this.closeMenuItem = new MenuItem("Close"); 
     this.copyMenuItem = new MenuItem("Copy"); 
     this.monthlyAppointmentReportMenuItem = new MenuItem("Monthly Appointment Report"); 
     this.consultantScheduleMenuItem = new MenuItem("Consultant Schedule Report"); 
     this.customersByCountryMenuItem = new MenuItem("Customers by Country Report"); 
     this.aboutMenuItem = new MenuItem("About"); 
     this.vbAppView = new VBox(); 
     this.tpAppPane = new TabPane(); 
     this.tabCustomers = new Tab("Customers"); 
     this.tabCustomers.setClosable(false); 
     this.spCustomerEditor = new ScrollPane(); 
     this.tabAppointments = new Tab("Appointments"); 
     this.tabAppointments.setClosable(false); 
     this.spAppointmentEditor = new ScrollPane(); 

     // populate menus and menuBar and add them to top pane 

     this.fileMenu.getItems().setAll(closeMenuItem); 
     this.fileMenu.setMnemonicParsing(true); 
     this.editMenu.getItems().setAll(copyMenuItem); 
     this.editMenu.setMnemonicParsing(true); 
     this.reportMenu 
       .getItems() 
       .setAll(monthlyAppointmentReportMenuItem, consultantScheduleMenuItem, customersByCountryMenuItem); 
     this.reportMenu.setMnemonicParsing(true); 
     this.helpMenu.getItems().setAll(aboutMenuItem); 
     this.helpMenu.setMnemonicParsing(true); 

     this.menuBar.getMenus().addAll(fileMenu, editMenu, reportMenu, helpMenu); 
     this.rootPane.setTop(menuBar); 

     // populate scroll panes with included views 
     this.spAppointmentEditor.setContent(getAppointmentView()); 
     this.spCustomerEditor.setContent(getCustomerView()); 

     // populate tab panes and controllers and add them to the center pane 
     this.tabAppointments.setContent(spAppointmentEditor); 
     this.tabCustomers.setContent(spCustomerEditor); 
     this.tpAppPane.getTabs().addAll(tabAppointments, tabCustomers); 

     vbAppView.getChildren().addAll(tpAppPane); 
     this.rootPane.setCenter(vbAppView); 

     // add data view to bottom pane 
     this.rootPane.setBottom(AppointmentViewController.getDataView()); 

     setupEventHandlers(this); 
    } 

    private void setupEventHandlers(AppViewController appViewController) { 

     this.tabCustomers.setOnSelectionChanged((event -> { 
      if (tabCustomers.isSelected()) { 
       // Change to Customer View 
       setCustomerView(); 
      } else { 
       setAppointmentView(); 
      } 
     })); 

     this.tabAppointments.setOnSelectionChanged(event -> { 
      if (tabAppointments.isSelected()) { 
       setAppointmentView(); 
      } else { 
       setCustomerView(); 
      } 
     }); 

     this.closeMenuItem.setOnAction(event -> quitApp()); 

     this.tpAppPane.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> { 
      if(newValue.getText().toLowerCase().equals("Customer".toLowerCase())){ 
       setCustomerView(); 
      } 

      if (newValue.getText().toLowerCase().equals("Appointments".toLowerCase())){ 
       setAppointmentView(); 
      } 
     }); 
    } 

    private void setCustomerView() { 
     CustomerViewController customerViewController = CustomerViewController.getInstance(); 
     setDataView(customerViewController.getDataViewController().tabPane); 
     customerViewController.getGpCustomerEditor().getChildren().filtered(node -> toggleTextFields(node, true)); 

    } 

    private void setAppointmentView() { 
     AppointmentViewController controller = AppointmentViewController.getInstance(); 
     setDataView(controller.getDataViewController().tabPane); 
     controller.getGpAppointmentEditor().getChildren().filtered(node -> toggleTextFields(node, true)); 
    } 

    /*** 
    * Sets whether text fields are enabled or disabled 
    * true = disable Text Fields 
    * false = enable Text Fields 
    * @param node the child nodes of the editor 
    * @param disabled whether to disable or enable the text fields 
    * @return whether node was affected or not 
    */ 
    public static boolean toggleTextFields(Node node, boolean disabled) { 
     if (node instanceof TextField) { 
      ((TextField) node).setEditable(!disabled); 
      node.setDisable(disabled); 
      return true; 
     } 
     return false; 
    } 

    public void setMainApp(MainApp mainApp) { 
     this.mainApp = mainApp; 
    } 

    private void quitApp() { 
     Platform.exit(); 
    } 

    public Parent getBorderPane() { 
     return rootPane; 
    } 

    public TabPane getTpAppPane() { 
     return tpAppPane; 
    } 

    public Tab getTabCustomers() { 
     return tabCustomers; 
    } 

    public Tab getTabAppointments() { 
     return tabAppointments; 
    } 

    @Override 
    public String toString() { 
     final StringBuffer sb = new StringBuffer("AppViewController{"); 
     sb.append("\nrootPane=").append(rootPane); 
     sb.append(",\n menuBar=").append(menuBar); 
     sb.append(",\n fileMenu=").append(fileMenu); 
     sb.append(",\n editMenu=").append(editMenu); 
     sb.append(",\n reportMenu=").append(reportMenu); 
     sb.append(",\n helpMenu=").append(helpMenu); 
     sb.append(",\n closeMenuItem=").append(closeMenuItem); 
     sb.append(",\n copyMenuItem=").append(copyMenuItem); 
     sb.append(",\n monthlyAppointmentReportMenuItem=").append(monthlyAppointmentReportMenuItem); 
     sb.append(",\n consultantScheduleMenuItem=").append(consultantScheduleMenuItem); 
     sb.append(",\n customersByCountryMenuItem=").append(customersByCountryMenuItem); 
     sb.append(",\n aboutMenuItem=").append(aboutMenuItem); 
     sb.append(",\n vbAppView=").append(vbAppView); 
     sb.append(",\n tpAppPane=").append(tpAppPane); 
     sb.append(",\n tabCustomers=").append(tabCustomers); 
     sb.append(",\n spCustomerEditor=").append(spCustomerEditor); 
     sb.append(",\n tabAppointments=").append(tabAppointments); 
     sb.append(",\n spAppointmentEditor=").append(spAppointmentEditor); 
     sb.append(",\n dataViewController=").append(dataViewController); 
     sb.append("\n}"); 
     return sb.toString(); 
    } 

    public void setDataViewController(DataViewController dataViewController) { 
     this.dataViewController = dataViewController; 
    } 

    public DataViewController getDataViewController() { 
     return dataViewController; 
    } 
} 

而且AppointmentView：

private TableView<AppointmentView> tvAppointments = new TableView<>(); 
private TableColumn<AppointmentView, String> tcTitle = new TableColumn<>("Title"); 
private TableColumn<AppointmentView, String> tcDescription = new TableColumn<>("Description"); 
private TableColumn<AppointmentView, String> tcLocation = new TableColumn<>("Location"); 
private TableColumn<AppointmentView, String> tcContact = new TableColumn<>("Contact"); 
private TableColumn<AppointmentView, String> tcUrl = new TableColumn<>("URL"); 
private TableColumn<AppointmentView, String> tcCustomerName = new TableColumn<>("Customer Name"); 
private TableColumn<AppointmentView, ZonedDateTime> tcStart = new TableColumn<>("Start Time"); 
private TableColumn<AppointmentView, ZonedDateTime> tcEnd = new TableColumn<>("End Time"); 
private TableColumn<AppointmentView, ZonedDateTime> tcCreateDate = new TableColumn<>("Created Date"); 
private TableColumn<AppointmentView, String> tcCreatedBy = new TableColumn<>("Created By"); 
private TableColumn<AppointmentView, Timestamp> tcLastUpdate = new TableColumn<>("Last Updated"); 
---- snip ---- 
    this.tcTitle.setCellValueFactory(new PropertyValueFactory<>("title")); 
    this.tcTitle.setVisible(true); 
    this.tcTitle.setMinWidth(50); 

    this.tcCustomerName.setCellValueFactory(new PropertyValueFactory<>("customerName")); 
    this.tcCustomerName.setVisible(true); 
    this.tcCustomerName.setMinWidth(40); 

    this.tcDescription.setCellValueFactory(new PropertyValueFactory<>("description")); 
    this.tcDescription.setVisible(true); 
    this.tcDescription.setMinWidth(100); 

    this.tcLocation.setCellValueFactory(new PropertyValueFactory<>("location")); 
    this.tcLocation.setVisible(true); 
    this.tcLocation.setMinWidth(40); 

    this.tcContact.setCellValueFactory(new PropertyValueFactory<>("contact")); 
    this.tcContact.setVisible(true); 
    this.tcContact.setMinWidth(40); 

    this.tcUrl.setCellValueFactory(new PropertyValueFactory<>("url".toUpperCase())); 
    this.tcUrl.setVisible(true); 
    this.tcUrl.setMinWidth(40); 

    this.tcStart.setCellValueFactory(new PropertyValueFactory<>("start")); 
    this.tcStart.setVisible(true); 
    this.tcStart.setMinWidth(40); 

    this.tcEnd.setCellValueFactory(new PropertyValueFactory<>("end")); 
    this.tcEnd.setVisible(true); 
    this.tcEnd.setMinWidth(40); 

    this.tcCreateDate.setCellValueFactory(new PropertyValueFactory<>("createDate")); 
    this.tcCreateDate.setVisible(true); 
    this.tcCreateDate.setMinWidth(40); 

    this.tcCreatedBy.setCellValueFactory(new PropertyValueFactory<>("createdBy")); 
    this.tcCreatedBy.setVisible(true); 
    this.tcCreatedBy.setMinWidth(40); 

    this.tcLastUpdate.setCellValueFactory(new PropertyValueFactory<>("lastUpdate")); 
    this.tcLastUpdate.setVisible(true); 
    this.tcLastUpdate.setMinWidth(40); 

    this.tvAppointments = new TableView<>(); 
    this.tvAppointments.setItems(appointmentViews); 
    this.tvAppointments.getColumns().addAll(
      tcTitle, 
      tcDescription, 
      tcLocation, 
      tcContact, 
      tcUrl, 
      tcCustomerName, 
      tcStart, 
      tcEnd, 
      tcCreateDate, 
      tcCreatedBy, 
      tcLastUpdate); 


    this.lvListView = new ListView<>(); 
    this.lvListView.setItems(appointmentViews); 

    this.dataViewController.setTableView(this.tvAppointments); 
    this.dataViewController.setLblListView(new Label("Appointment List")); 
    this.dataViewController.setListView(this.lvListView); 
    this.dataViewController.setLblTableView(new Label("Appointments")); 

和底座DataViewController那我試圖操縱：

public class DataViewController extends TabPane { 

// private static DataViewController instance; 
    public TabPane tabPane; 
    private Tab tabTableView; 
    private Tab tabListView; 
    private VBox vbListView; 
    private VBox vbTableView; 
    private Label lblListView; 
    private Label lblTableView; 
    protected ScrollPane spListView; 
    protected ScrollPane spTableView; 
    private ListView<?> listView; 
    private TableView<?> tableView; 
    private MainApp mainApp; 

    public DataViewController() { 
     initialize(); 
    } 

/* public static DataViewController getInstance(){ 
     if(instance == null){ 
      new DataViewController(); 
     } 
     return instance; 
    }*/ 

    /** 
    * Called to initialize a controller after its root element has been 
    * completely processed. 
    * 
    */ 
    public void initialize() { 
//  this.instance = this; 
     this.tabPane = new TabPane(); 
     this.tabPane.setPrefHeight(250.0); 
     this.tabPane.setMaxHeight(400.0); 
     this.tabPane.setMaxWidth(Integer.MAX_VALUE); 
     this.tabTableView = new Tab("Table View"); 
     this.tabTableView.setClosable(false); 
     this.tabListView = new Tab("List View"); 
     this.tabListView.setClosable(false); 
     this.spListView = new ScrollPane(); 
     this.spTableView = new ScrollPane(); 
     this.lblListView = new Label("List View"); 
     this.lblTableView = new Label("Table View"); 
     this.vbListView = new VBox(); 
     this.vbTableView = new VBox(); 
     this.listView = new ListView<>(); 
     this.tableView = new TableView<>(); 

     this.vbListView.getChildren().setAll(this.lblListView, this.listView); 
     this.spListView.setContent(this.listView); 
     this.tabListView.setContent(this.spListView); 


     this.vbTableView.getChildren().setAll(this.lblTableView, this.spTableView); 
     this.spTableView.setContent(this.tableView); 
     this.tabTableView.setContent(vbTableView); 

     this.tabPane.getTabs().setAll(tabListView, tabTableView); 
    } 

    public Label getLblListView() { 
     return lblListView; 
    } 

    public void setLblListView(Label lblListView) { 
     this.lblListView = lblListView; 
    } 

    public Label getLblTableView() { 
     return lblTableView; 
    } 

    public void setLblTableView(Label lblTableView) { 
     this.lblTableView = lblTableView; 
    } 

    public ListView<?> getListView() { 
     return listView; 
    } 

    public void setListView(ListView<?> listView) { 
     this.listView = listView; 
    } 

    public TableView<?> getTableView() { 
     return tableView; 
    } 

    public void setTableView(TableView<?> tableView) { 
     this.tableView = tableView; 
    } 

    public void setMainApp(MainApp mainApp){ 
     this.mainApp = mainApp; 
    } 

/* public static DataViewController getInstance() { 
     if (instance == null){ 
      instance = new DataViewController(); 
     } 
     return instance; 
    }*/ 

    @Override 
    public String toString() { 
     return new StringBuilder() 
       .append("DataViewController{") 
       .append("\ntabPane=") 
       .append(tabPane) 
       .append(", \ntabTableView=") 
       .append(tabTableView) 
       .append(", \ntabListView=") 
       .append(tabListView) 
       .append(", \nvbListView=") 
       .append(vbListView) 
       .append(", \nvbTableView=") 
       .append(vbTableView) 
       .append(", \nlblListView=") 
       .append(lblListView.getText()) 
       .append(", \nlblTableView=") 
       .append(lblTableView.getText()) 
       .append(", \nspListView=") 
       .append(spListView) 
       .append(", \nspTableView=") 
       .append(spTableView) 
       .append(", \nlistView=") 
       .append(listView.getItems()) 
       .append(", \ntableView=") 
       .append(tableView.getColumns()) 
       .append("\n}") 
       .toString(); 
    } 
} 

如前所述，我把幾的toString調用和實現，並且我一直按照該看到在DataViewController的對象：

listView=[AppointmentView{createdDate=2017-09-02T00:00-07:00[America/Los_Angeles], createdBy='test1', titleProperty=StringProperty [value: Meet with Amari], descriptionProperty=StringProperty [value: Meeting WR of the Raiders], locationProperty=StringProperty [value: Raiders HQ, Alameda], contactProperty=StringProperty [value: Jack DelRio], urlProperty=StringProperty [value: raiders.com], customerName=StringProperty [value: Amari Cooper], startProperty=ObjectProperty [value: 2017-09-04T16:00-07:00[America/Los_Angeles]], endProperty=ObjectProperty [value: 2017-09-04T16:15-07:00[America/Los_Angeles]], lastUpdated=ObjectProperty [value: 2017-09-02T23:07-07:00[America/Los_Angeles]]}, AppointmentView{createdDate=2017-09-02T00:00-07:00[America/Los_Angeles], createdBy='test1', titleProperty=StringProperty [value: Meet with Amari], descriptionProperty=StringProperty [value: Meeting WR of the Raiders], locationProperty=StringProperty [value: Raiders HQ, Alameda], contactProperty=StringProperty [value: Jack DelRio], urlProperty=StringProperty [value: raiders.com], customerName=StringProperty [value: Amari Cooper], startProperty=ObjectProperty [value: 2017-09-04T16:00-07:00[America/Los_Angeles]], endProperty=ObjectProperty [value: 2017-09-04T16:15-07:00[America/Los_Angeles]], lastUpdated=ObjectProperty [value: 2017-09-02T23:07-07:00[America/Los_Angeles]]}], 
tableView=[javafx.scene.control.TableColumn@6167e82, javafx.scene.control.TableColumn@50658769, javafx.scene.control.TableColumn@f65aae1, javafx.scene.control.TableColumn@2d5ab3ab, javafx.scene.control.TableColumn@180d2aec, javafx.scene.control.TableColumn@64afb84b, javafx.scene.control.TableColumn@463f349d, javafx.scene.control.TableColumn@3e80101a, javafx.scene.control.TableColumn@4fab076c, javafx.scene.control.TableColumn@565f8332, javafx.scene.control.TableColumn@697bdeb8] 

而這裏的MainApp方法調用它：

private void initLayout() { 
//  rootPane = new BorderPane(); 



    appointmentViewController = AppointmentViewController.getInstance(); 
    appointmentView = appointmentViewController.apAppointmentView; 
    appointmentViewController.setMainApp(this); 

    dataViewController = appointmentViewController.getDataViewController(); 
    dataView = dataViewController.tabPane; 
    dataViewController.setMainApp(this); 

    customerViewController = CustomerViewController.getInstance(); 
    customerView = customerViewController.apCustomerView; 
    customerViewController.setMainApp(this); 

    appViewController = AppViewController.getInstance(); 
    appView = appViewController.getBorderPane(); 
    appViewController.setMainApp(this); 

    appViewController.setDataViewController(appointmentViewController.getDataViewController()); 

    System.out.println(this.dataViewController); 
    System.out.println(this.dataView); 
    System.out.println(appointmentViewController.toString()); 
    System.out.println(customerViewController.toString()); 
    System.out.println(appViewController.toString()); 

    rootPane = (BorderPane) appView; 


    scene = new Scene(rootPane); 
    scene.getStylesheets().add("/styles/Styles.css"); 

    primaryStage.setScene(scene); 
    primaryStage.show(); 
} 

我已經設置了CellValueFactories等。我在這裏錯過了什麼？

這是UI是如何顯示：

Answer 1

在DataViewController現場結構從構造函數初始化。使用這個類中的任何一個setter修改這個字段，它確實在不是以任何方式修改場景，在場景中留下舊的空的ListView，但打印包含toString方法中的項的新的一個。