Filepath

Question

Hey,
My last problem using a filechooser lead me into a bunch of related trouble. I wrote this demo to ask - just run the proggy and you'll see.
I got a problem concatenating a path to a folder with a filename.
I got a problem putting "/" in the end of a folder path name.
I got a problem with the "folders only" option for the JFileChooser on Linux.
thx, in advance!!!
package filepath;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.WindowConstants;
public class PathFrame extends javax.swing.JFrame {
     private JLabel lbPathByTF;
     private JTextField tfPath;
     private JPanel panSetUpFolderPath;
     private JPanel panFiles;
     private JLabel lbFileName2;
     private JLabel lbFileName1;
     private JLabel lbPathByButton;
     private JButton butPath;
     // Filenames
     private String szFileA = "FileA.txt";
     private String szFileB = "FileB.txt";
     private File folder;
     * Auto-generated main method to display this JFrame
     public static void main(String[] args) {
          PathFrame inst = new PathFrame();
          inst.setVisible(true);
     public PathFrame() {
          super();
          init();
      * inits & grafical mess
     private void init(){
          folder = new File("");
          initGUI();
          initAL();
     private void initGUI() {
          try {
               GridBagLayout thisLayout = new GridBagLayout();
               thisLayout.rowWeights = new double[] {0.0,0.0,0.1,0.0,0.0};
               thisLayout.rowHeights = new int[] {7,7,20,20,7};
               thisLayout.columnWeights = new double[] {0.0,0.1,0.0};
               thisLayout.columnWidths = new int[] {7,7,7};
               getContentPane().setLayout(thisLayout);
               setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
               this.setResizable(false);
                    panFiles = new JPanel();
                    GridBagLayout panFilesLayout = new GridBagLayout();
                    panFilesLayout.rowWeights = new double[] {0.1,0.0,0.1};
                    panFilesLayout.rowHeights = new int[] {7,7,7};
                    panFilesLayout.columnWeights = new double[] {0.1};
                    panFilesLayout.columnWidths = new int[] {7};
                    panFiles.setLayout(panFilesLayout);
                    getContentPane().add(panFiles, new GridBagConstraints(1, 3, 1, 1, 0.0, 0.0, GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
                    panFiles.setBorder(BorderFactory.createTitledBorder("  resulting file paths are now:  "));
                         lbFileName1 = new JLabel();
                         panFiles.add(lbFileName1, new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0, GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
                         lbFileName1.setText("my file A");
                         lbFileName1.setPreferredSize(new java.awt.Dimension(350, 22));
                         lbFileName2 = new JLabel();
                         panFiles.add(lbFileName2, new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0, GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
                         lbFileName2.setText("my file B");
                         lbFileName2.setPreferredSize(new java.awt.Dimension(350, 22));
                    panSetUpFolderPath = new JPanel();
                    GridBagLayout panSetUpFolderPathLayout = new GridBagLayout();
                    panSetUpFolderPathLayout.rowWeights = new double[] {0.1,0.0,0.0,0.1,0.1};
                    panSetUpFolderPathLayout.rowHeights = new int[] {7,7,7,7,20};
                    panSetUpFolderPathLayout.columnWeights = new double[] {0.0,0.1};
                    panSetUpFolderPathLayout.columnWidths = new int[] {7,7};
                    panSetUpFolderPath.setLayout(panSetUpFolderPathLayout);
                    getContentPane().add(panSetUpFolderPath, new GridBagConstraints(1, 1, 1, 1, 0.0, 0.0, GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
                    panSetUpFolderPath.setBorder(BorderFactory.createTitledBorder("  Set up the path to to a folder:  "));
                         tfPath = new JTextField();
                         panSetUpFolderPath.add(tfPath, new GridBagConstraints(1, 1, 1, 1, 0.0, 0.0, GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
                         tfPath.setText("my path");
                         tfPath.setPreferredSize(new java.awt.Dimension(350, 22));
                         butPath = new JButton();
                         panSetUpFolderPath.add(butPath, new GridBagConstraints(1, 4, 1, 1, 0.0, 0.0, GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
                         butPath.setText("browse");
                         butPath.setPreferredSize(new java.awt.Dimension(100, 22));
                         lbPathByTF = new JLabel();
                         panSetUpFolderPath.add(lbPathByTF, new GridBagConstraints(0, 0, 2, 1, 0.0, 0.0, GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
                         lbPathByTF.setText("my path");
                         lbPathByTF.setPreferredSize(new java.awt.Dimension(350, 22));
                         lbPathByButton = new JLabel();
                         panSetUpFolderPath.add(lbPathByButton, new GridBagConstraints(0, 3, 2, 1, 0.0, 0.0, GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
                         lbPathByButton.setText("my path");
                         lbPathByButton.setPreferredSize(new java.awt.Dimension(350, 22));
               pack();
               setSize(400, 300);
          } catch (Exception e) {
               e.printStackTrace();
     private void initAL(){
          butPath.addActionListener( new ActionListener(){
               public void actionPerformed( ActionEvent ae){
                    choose();
          tfPath.addActionListener( new ActionListener(){
               public void actionPerformed( ActionEvent ae){
                    getPath();
      * actions
      * implements a filechooser to find the folder
     private void choose(){
          JFileChooser fc;
         fc = new JFileChooser(folder.getAbsoluteFile());
          int hInput = fc.showOpenDialog(this);
          if( hInput == JFileChooser.APPROVE_OPTION){
               fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY );
//               fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
                * Problem: selecting folders doesn't work!
                * If I select a folder and click on the open button of the
                * filechooser it just opens but not selected!?
               if(fc.getSelectedFile().exists()){
                    folder = fc.getSelectedFile();
               }else{
                    folder = new File("");
          lbPathByButton.setText( folder.getAbsolutePath());
          refreshFilePaths();
      * takes the path to a folder directly from the <CODE>JTextField</CODE>
     private void getPath(){
          folder = new File(tfPath.getText());
           * Problem: I always obtain the path without "/" or "\" at the end. Thus concatenating
           *           this path with some file name will lead to something odd.
           *           e.g. /mnt/datasettings.xml and not /mnt/data/settings.xml like it should.
           * Problem: Even if I add a "/" in the textfield it just won't take it? It takes "\" but no "/"
           *           at the End. (I'm working on Debian/Linux hence I need "/").
          lbPathByTF.setText( folder.getAbsolutePath());
          refreshFilePaths();
      * basic access
     private void refreshFilePaths(){
          lbFileName1.setText( folder.getAbsolutePath() + szFileA);
          lbFileName2.setText(folder.getAbsolutePath() + szFileB);
}

Answer 1

1)
these
private String szFileA = "FileA.txt";
private String szFileB = "FileB.txt";
should be
private String szFileA = "\\FileA.txt";
private String szFileB = "\\FileB.txt";
2)
you're setting the selection mode after the chooser is visible
fc = new JFileChooser(folder.getAbsoluteFile());
int hInput = fc.showOpenDialog(this);
if( hInput == JFileChooser.APPROVE_OPTION){
fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY );//fc is already showing???
should be
fc = new JFileChooser(folder.getAbsoluteFile());
fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY );//<-----move to here
int hInput = fc.showOpenDialog(this);
if( hInput == JFileChooser.APPROVE_OPTION){
//fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY );//<----moved