I can't give my variable to the get method

Question

Hello togheter
At the moment I work with JDOM. It is possible to get access to an XML File with JDOM, but I want to pass the String I get, to another Method in a different class. My problem is, that my getMethod doesn't get the variable. The variable is always "null". What is the problem, please help me.
I will also give you my code:
Here is the code for class 1, I take the String from this class. See the arrow
package FahrplanXML;
import java.io.File;
import java.io.IOException;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;
import org.jdom.Attribute;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.xml.sax.InputSource;
public class FileAuswahl {
   private File filenames;
   private String scheduledtdversion;
   public void ablauf() throws JDOMException, IOException {
      FileAuswaehlen();
      saxwer();
      grundoberflaeche xmloberflaeche = new grundoberflaeche();
      xmloberflaeche.grundoberflaechen();
   public void FileAuswaehlen() {
   JFileChooser datei = new JFileChooser();
   datei.setFileFilter(new FileFilter()
            @Override public boolean accept (File f)
               return f.isDirectory() ||
               f.getName().toLowerCase().endsWith(".xml");
            @Override public String getDescription()
               return "XML-Files";
   int state = datei.showOpenDialog(null);
   if (state == JFileChooser.APPROVE_OPTION )
      filenames = datei.getSelectedFile();
      System.out.println (filenames);
      if (filenames != null)
               try {
                  System.out.print(filenames);
                  saxwer();
               } catch (JDOMException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
               } catch (IOException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
      else
         System.out.println("Kein File ausgew�hlt");
   else
   System.out.println("Auswahl abgebrochen");
   System.exit(0);
   //Ausgew�hlter Dateiname an saxwer �bergeben
   public File getNames() {
      System.out.println (filenames);
      return this.filenames;
   public void saxwer() throws JDOMException, IOException {
      //FileAuswahl filename = new FileAuswahl();
      File files = getNames();
      System.out.println (files);
         SAXBuilder builder = new SAXBuilder();
         Document doc = builder.build(files);
         Element schedulemessage = doc.getRootElement();
         //Root Element auslesen
         String sch_msg_dtdversion = schedulemessage.getAttributeValue ("DtdVersion");  // <---
         scheduledtdversion = sch_msg_dtdversion;
         new grundoberflaeche().grundoberflaechen();
         public String getDtdVersion() {
            System.out.println (scheduledtdversion);
            return this.scheduledtdversion;
   } Now, you will see the class in which I pass the String. See also arrow...
package FahrplanXML;
import java.awt.Component;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.text.Caret;
import org.jdom.Attribute;
import org.jdom.JDOMException;
public class grundoberflaeche {
//      Layout f�r Laender vorbereiten
      static void addComponent (Container cont,
            GridBagLayout diversemoegl,
            Component laenderdetails,
            int x, int y,
            int width, int height,
            double weightx, double weighty )
            GridBagConstraints grundoberflaechen = new GridBagConstraints();
            grundoberflaechen.fill = GridBagConstraints.BOTH;
            grundoberflaechen.gridx = x; grundoberflaechen.gridy = y;
            grundoberflaechen.gridwidth = width; grundoberflaechen.gridheight = height;
            grundoberflaechen.weightx = weightx; grundoberflaechen.weighty = weighty;
            diversemoegl.setConstraints(laenderdetails, grundoberflaechen);
            cont.add(laenderdetails);
      //Ausw�hlen des XML Files
      public void XMLAuswaehlen() {
         JFrame xmlauswahl = new JFrame("Fahrplan ausw�hlen");
         xmlauswahl.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         Container laenderdetails = xmlauswahl.getContentPane();
         GridBagLayout diversemoegl = new GridBagLayout();
         laenderdetails.setLayout(diversemoegl);
         JButton dateiauswahl = new JButton ("Datei ausw�hlen");
         addComponent(laenderdetails,diversemoegl,dateiauswahl,1,1,1,1,1,1);
         ActionListener ersterdateiauswaehler = new ActionListener()
            public void actionPerformed( ActionEvent e)
                  try {
                     new FileAuswahl().ablauf();
                  } catch (JDOMException e1) {
                     // TODO Auto-generated catch block
                     e1.printStackTrace();
                  } catch (IOException e1) {
                     // TODO Auto-generated catch block
                     e1.printStackTrace();
         dateiauswahl.addActionListener(ersterdateiauswaehler);
         xmlauswahl.setSize(150,70);
         xmlauswahl.setVisible(true);
      //Layout machen
      public void grundoberflaechen() {
         JFrame fahrplan = new JFrame("Fahrplanauswahldetails");
         fahrplan.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         Container laenderdetails = fahrplan.getContentPane();
         GridBagLayout diversemoegl = new GridBagLayout();
         laenderdetails.setLayout(diversemoegl);
         //Klassenobjekt aufbauen
         FileAuswahl fileauswahl = new FileAuswahl();
         // Labelsbauen und einbauen in den Fahrpl�nen
         String dtdversion = fileauswahl.getDtdVersion();   // <---
         System.out.println(dtdversion);
         JTextField DtdVersion = new JTextField(1);
         DtdVersion.setText(dtdversion);
         JTextField fahrplanzeit = new JTextField(1);
         fahrplanzeit.setText("123");
         JTextField fahrplanzeita = new JTextField(1);
         fahrplanzeita.setText("piips");
         //JButton oesterreich = new JButton("�sterreich");
         //JButton italien = new JButton("Italien");
         //JButton frankreich = new JButton("Frankreich");
         //JButton spanien = new JButton("Spanien");
         addComponent(laenderdetails,diversemoegl,new JLabel("Fahrplandetails"),0,0,1,1,0,0);
         addComponent(laenderdetails,diversemoegl,DtdVersion,1,0,1,1,0,0);
         addComponent(laenderdetails,diversemoegl,fahrplanzeit,2,0,1,1,0,0);
         addComponent(laenderdetails,diversemoegl,fahrplanzeita,3,0,1,1,0,0);
         //         Action Listener f�r Dateiauswahl
         //         Action Listener f�r das Speichern der Datei
         //addComponent(laenderdetails,diversemoegl,frankreich,2,1,1,1,0,0);
         //addComponent(laenderdetails,diversemoegl,spanien,3,1,1,1,0,0);
         fahrplan.setSize(600,750);
         fahrplan.setVisible(true);
}Thank you very much for your help....
Your Java Learner

Answer 1

Reposted here, rather than bumping up this topic:
http://forum.java.sun.com/thread.jspa?threadID=736492