什么是错误的遵循JavaFX代码？

Question

以下代码是在JavaFX中实现的登录验证代码。但是我收到很多错误，不知道为什么......请检查以下2个代码 textField Id：用户 passwordField Id：传递

sample.fxml（使用SceneBuilder）

    <?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>

<AnchorPane id="LoginAnchor" prefHeight="318.0" prefWidth="443.0" styleClass="background" stylesheets="@LoginStylesheet.css" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <children>
      <VBox alignment="CENTER" layoutX="32.0" layoutY="13.0" prefHeight="108.0" prefWidth="247.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
         <children>
            <HBox alignment="CENTER">
               <children>
                  <Label id="label" text="Username:">
                     <HBox.margin>
                        <Insets right="10.0" />
                     </HBox.margin>
                  </Label>
                  <TextField id="user" />
               </children>
            </HBox>
            <HBox alignment="CENTER">
               <children>
                  <Label text="Password:">
                     <HBox.margin>
                        <Insets right="11.0" />
                     </HBox.margin>
                  </Label>
                  <PasswordField id="pass">
                     <HBox.margin>
                        <Insets left="2.0" />
                     </HBox.margin>
                  </PasswordField>
               </children>
               <VBox.margin>
                  <Insets bottom="10.0" top="10.0" />
               </VBox.margin>
            </HBox>
            <Button fx:id="loginButton" alignment="CENTER" mnemonicParsing="false" onAction="#loginButtonClicked" text="Log In" />
         </children>
      </VBox>
   </children>
</AnchorPane>

controller.java

    package sample;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;

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

public class Controller implements Initializable {
    @FXML
    private TextField user;
    @FXML
    private PasswordField pass;

    @Override
    public void initialize(URL location, ResourceBundle resources) {

    }

    @FXML
    public void loginButtonClicked(ActionEvent event) {
        if (user.getText().equals("test") && pass.getText().equals("password")) {
            System.out.println("log In" + user.getText());
        } else {
            System.out.println("not Login");
        }
    }
}