找不到：使用getAbsolutePath（）方法找不到符号

Question

我正在尝试使用方法“ getAbsolutePath（）”，但我一直在收到错误消息：找不到符号。这是我的使用方式：错误：找不到符号

：错误：找不到符号System.out.println（sneakers_application.selectedFileXML.getAbsolutePath（））;   符号：class selectedFileXML

我试图在同一个班级中拥有一切

public class Sneakers_application extends Application {

    public static File selectedFileXLSX, selectedFileTXT, selectedFileXML, selectedFileMySQL;

    @Override
    public void start(Stage primaryStage) {

         // DAO_Sneakers daoSneaker = Factory.getDAOInstance(DAO_DB_TYPE.TEXTFILE);
          //DAO_Sneakers daoSneaker = Factory.getDAOInstance(DAO_DB_TYPE.EXCEL);
          //DAO_Sneakers daoSneaker = Factory.getDAOInstance(DAO_DB_TYPE.MYSQL);
          //DAO_Sneakers daoSneaker = Factory.getDAOInstance(DAO_DB_TYPE.XML);

        Scene scene = new Scene(new Sneakers_Gui(daoSneaker));

        primaryStage.setTitle("sneakersnstuff");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
}

 public class MenuListener implements EventHandler {

        @Override
        public void handle(Event event) {

            MenuItem item = (MenuItem) event.getSource();
            switch (item.getText()) {


                case "Excel file":
                    daoSneaker = (DAO_Sneakers) Factory.getDAOInstance(DAO_DB_TYPE.EXCEL);
                    FileChooser fc = new FileChooser();
                    fc.getExtensionFilters().addAll(new FileChooser.ExtensionFilter("Excel", "*.xlsx"));
                    Sneakers_application.selectedFileXLSX = fc.showOpenDialog(null);

                    System.out.println(sneakers_application.selectedFileXLSX.getAbsolutePath());
                    obsListSneaker.setAll(daoSneaker.getSneaker());
                    obsListModell.setAll(modellList());
                    break;
                case "Text file":
                    daoSneaker = (DAO_Sneakers) Factory.getDAOInstance(DAO_DB_TYPE.TEXTFILE);
                    fc = new FileChooser();
                    fc.getExtensionFilters().addAll(new FileChooser.ExtensionFilter("Textfile", "*.txt"));
                   Sneakers_application.selectedFileTXT = fc.showOpenDialog(null);

                    System.out.println(sneakers_application.selectedFileTXT.getAbsolutePath());
                    obsListSneaker.setAll(daoSneaker.getSneaker());
                    obsListModell.setAll(modellList());
                    break;
                case "XML file":
                    daoSneaker = (DAO_Sneakers) Factory.getDAOInstance(DAO_DB_TYPE.XML);
                    fc = new FileChooser();
                    fc.getExtensionFilters().addAll(new FileChooser.ExtensionFilter("Xml", "*.xml"));
                    Sneakers_application.selectedFileXML = fc.showOpenDialog(null);

                    System.out.println(sneakers_application.selectedFileXML.getAbsolutePath());
                    obsListSneaker.setAll(daoSneaker.getSneaker());
                    obsListModell.setAll(modellList());
                    break;
                case "MySQL":
                    daoSneaker = (DAO_Sneakers) Factory.getDAOInstance(DAO_DB_TYPE.MYSQL);
                    obsListSneaker.setAll(daoSneaker.getSneaker());
                    obsListModell.setAll(modellList());
                    break;

                case "Backup to XML":
                    backup.deleteXML();
                    backup.backupToXML();
            }
        }

    }