Question

我的代码遇到了一些麻烦，涉及对组合框的修改。以下代码是fxml文件的控制器。问题来自尝试设置ComboBox禁用时的第49行。在fxml文件（combo_destination）中通知了fx：id，但仍然存在空指针异常。

我不知道为什么它不起作用，但我认为这似乎很基本？

package ch.makery.adress.view;

import javafx.collections.FXCollections;    
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import ch.makery.adress.MainApp;
import ch.makery.adress.util.FileFilterXLSX;
import ch.makery.adress.model.Donnees;

import javax.swing.JFileChooser;        

public class MenuOverviewController {

@FXML
private ComboBox combo_periode;
@FXML
private ComboBox combo_destination;
@FXML
private ComboBox combo_type_avion;
@FXML
private ComboBox combo_type_vol;

@FXML
private Button button_param;
@FXML
private Button button_valider;
@FXML
private Button button_search;

@FXML
private TextField text_remplissage;
@FXML
private TextField text_path;

private MainApp mainApp;


/* ------------------------- */

public MenuOverviewController() {
    combo_destination.setDisable(true);
}

@FXML
private void initialize() {
}

@FXML
private void handleParametresAvances() {
    this.mainApp.showParametresOverview();
}

@FXML
private void handleLancement() {
    this.mainApp.showRapport();
}

@FXML
private void handleSearch() {
    JFileChooser chooser = new JFileChooser("C:\\Users\\Matth\\Documents\\ACTEMIUM\\Convoyeur de tri");

    chooser.setDialogTitle("Sélectionner le fichier source");
    chooser.setFileFilter(new FileFilterXLSX());
    chooser.showOpenDialog(null);

    text_path.setText(chooser.getSelectedFile().getPath());

}

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

}

}

/ * FXML文件* /

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

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Tab?>
<?import javafx.scene.control.TabPane?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>

<AnchorPane prefHeight="500.0" prefWidth="350.0" stylesheets="@light.css" xmlns="http://javafx.com/javafx/10.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="ch.makery.adress.view.MenuOverviewController">
   <children>
      <TabPane layoutX="14.0" layoutY="14.0" prefHeight="200.0" prefWidth="200.0" tabClosingPolicy="UNAVAILABLE" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
        <tabs>
          <Tab text="Simulation">
            <content>
              <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
                 <children>
                    <Label layoutX="-22.0" layoutY="7.0" text="Paramétrage de la simulation" AnchorPane.leftAnchor="20.0" AnchorPane.topAnchor="20.0">
                       <font>
                          <Font name="System Bold" size="16.0" />
                       </font>
                    </Label>
                    <ComboBox fx:id="combo_type_vol" layoutX="20.0" layoutY="218.0" prefHeight="29.0" prefWidth="198.0" promptText="Type de vol" AnchorPane.leftAnchor="20.0" />
                    <ComboBox fx:id="combo_type_avion" layoutX="20.0" layoutY="166.0" prefHeight="29.0" prefWidth="197.0" promptText="Type d'avion" AnchorPane.leftAnchor="20.0" />
                    <ComboBox fx:id="combo_destination" layoutX="20.0" layoutY="113.0" prefHeight="29.0" prefWidth="196.0" promptText="Destination" AnchorPane.leftAnchor="20.0" />
                    <ComboBox fx:id="combo_periode" layoutX="20.0" layoutY="60.0" prefHeight="29.0" prefWidth="198.0" promptText="Période de l'année" AnchorPane.leftAnchor="20.0" />
                    <TextField fx:id="text_remplissage" layoutX="230.0" layoutY="168.0" prefHeight="26.0" prefWidth="108.0" promptText="Remplissage (%)" />
                    <Button fx:id="button_valider" layoutX="81.0" layoutY="387.0" mnemonicParsing="false" onAction="#handleLancement" prefHeight="32.0" prefWidth="200.0" text="Valider le paramétrage" />
                    <Button fx:id="button_param" layoutX="20.0" layoutY="267.0" mnemonicParsing="false" onAction="#handleParametresAvances" text="Paramètres avancés" />
                 </children>
              </AnchorPane>
        </content>
      </Tab>
      <Tab text="Importation de données">
        <content>
          <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
                 <children>
                    <TextField fx:id="text_path" layoutX="15.0" layoutY="58.0" prefHeight="26.0" prefWidth="262.0" promptText="Indiquer le chemin du fichier à importer" />
                    <Button fx:id="button_search" layoutX="286.0" layoutY="59.0" mnemonicParsing="false" onAction="#handleSearch" text="..." />
                    <Label layoutX="-37.0" layoutY="10.0" text="Importation d'un fichier source" AnchorPane.leftAnchor="20.0" AnchorPane.topAnchor="20.0">
                       <font>
                          <Font name="System Bold" size="16.0" />
                       </font>
                    </Label>
                 </children></AnchorPane>
        </content>
      </Tab>
        <Tab text="Aide">
          <content>
            <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0" />
          </content>
        </Tab>
    </tabs>
  </TabPane>
   </children>
</AnchorPane>

尝试修改ComboBox时出现空指针异常

0 个答案: