Combobox trong JavaFX

package sample.Main12;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;

import java.net.URL;
import java.util.ResourceBundle;

public class Controller implements Initializable{
    @FXML
    public ComboBox<String> comboBox;

    @FXML
    public Label label;

    ObservableList<String> list = FXCollections.observableArrayList("Java", "C#", "Python");
    @Override
    public void initialize(URL location, ResourceBundle resources) {
        comboBox.setItems(list);
    }
    public void comboBoxChanged (ActionEvent event){
        label.setText(comboBox.getValue());
    }
}
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package sample.Main12;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main12 extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        try{
            Parent root = FXMLLoader.load(this.getClass().getResource("sample.fxml"));
            Scene scene = new Scene(root);
            primaryStage.setScene(scene);
            primaryStage.show();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}
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<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.AnchorPane?>


<AnchorPane prefHeight="162.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/9" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Main12.Controller">
   <children>
      <ComboBox fx:id="comboBox" layoutX="233.0" layoutY="63.0" onAction="#comboBoxChanged" prefWidth="150.0" promptText="Language" />
      <Label fx:id="label" layoutX="113.0" layoutY="63.0" prefHeight="26.0" prefWidth="42.0" text="Label" />
   </children>
</AnchorPane>
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