JavaFx UI控件与代码间的绑定方法

@Override
 public void start(Stage primaryStage) throws Exception{
  Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
  BorderPane borderPane = (BorderPane)root.lookup("#iiid");

  TableView tableView = new TableView();
  TableColumn columnName = new TableColumn("姓名");
  TableColumn columClass = new TableColumn("班级");
  TableColumn columNum = new TableColumn("学号");
  tableView.getColumns().addAll(columnName, columClass, columNum);

  borderPane.setCenter(tableView);

  primaryStage.setTitle("应用测试");
  primaryStage.setScene(new Scene(root,500,500));
  primaryStage.show();
}

<BorderPane fx:id="iiid" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity"  
   prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.121"        
   xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">         
 <top>                            
  <Button fx:id="button1" mnemonicParsing="false" text="按钮1" BorderPane.alignment="CENTER"/>     
 </top>                           

</BorderPane>