JTable and storing up-dated in a file

Question

The first task is to save data entered in the JTable to a file.
I could not do this as I could not access the updated model.
I include the three files. At the moment the method tableChanged is stopping the init method loading because it sees this a table changed.
Any help after a day slogging at this would be most appreciated.
Yours Sincerely,
Kieran A. Murray
package tables;
import javax.swing.*;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.Vector;
import javax.swing.table.*;
public class PowerFrame extends JFrame
private JFrame PowerFrame;
private JTabbedPane PowerTabPane;
private JMenuItem fMenuOpen = null;
private JMenuItem fMenuSave = null;
private JMenuItem fMenuClose = null;
JavaFilter fJavaFilter = new JavaFilter ();
File fFile = new File ("default.dat");
private Object Vectorin;
private Object v;
public Vector q;
private int count;
private int xcount;
private int qcount;
private int ycount;
private int pcount;
private File file;
BusbarRecords Busbar = new BusbarRecords();
BusbarsUI ui = new BusbarsUI();
public PowerFrame () {
     super("Begin at the Beginning");
     addWindowListener(new WindowAdapter()
     { public void windowClosing(WindowEvent e)
     { System.exit(0);
     PowerTabPane = new JTabbedPane(SwingConstants.RIGHT);
     PowerTabPane.setBackground(Color.blue);
     PowerTabPane.setForeground(Color.white);
     populatePowerTabbedPane();
     buildMenu();
     getContentPane().add(PowerTabPane);
private void populatePowerTabbedPane()
     PowerTabPane.addTab("Busbars", null, new BusbarsUI(), "Data for Busbar");
private void buildMenu()
     JMenuBar mb = new JMenuBar();
     JMenu menu = new JMenu("File");
     setJMenuBar (mb);
     setSize (400,400);
     JMenuItem openitem = new JMenuItem("Open");
     JMenuItem saveitem = new JMenuItem("Save");
     JMenuItem exititem = new JMenuItem("Exit");
     exititem.addActionListener(new ActionListener()
     public void actionPerformed(ActionEvent e)
     System.exit(0);
     openitem.addActionListener(new ActionListener()
     public void actionPerformed ( ActionEvent e ) {
          boolean status = false;
          status = openFile ();
          if (!status)
          JOptionPane.showMessageDialog (
          null,
          "Error opening file!", "File Save Error",
          JOptionPane.ERROR_MESSAGE);
     saveitem.addActionListener(new ActionListener()
     public void actionPerformed ( ActionEvent e ) {
          boolean status = false;
          status = saveFile ();
          if (!status)
          JOptionPane.showMessageDialog (
          null,
          "Error opening file!", "File Open Error",
          JOptionPane.ERROR_MESSAGE);
     menu.add(openitem);
     menu.add(saveitem);
     menu.add(exititem);
     mb.add(menu);
     setJMenuBar(mb);
     * Use a JFileChooser in Open mode to select files
     * to open. Use a filter for FileFilter subclass to select
     * for *.java files. If a file is selected then read the
     * file and place the string into the textarea.
     boolean openFile () {
     JFileChooser fc = new JFileChooser ();
     fc.setDialogTitle ("Open File");
     // Choose only files, not directories
     fc.setFileSelectionMode ( JFileChooser.FILES_ONLY);
     // Start in current directory
     fc.setCurrentDirectory (new File ("."));
     // Set filter for Java source files.
     fc.setFileFilter (fJavaFilter);
     // Now open chooser
     int result = fc.showOpenDialog (this);
     if (result == JFileChooser.CANCEL_OPTION) {
     return true;
     } else if (result == JFileChooser.APPROVE_OPTION) {
     fFile = fc.getSelectedFile ();
               // Invoke the readFile method in this class
     q = (Vector) readFile (fFile);
          System.out.println(q.elementAt(1));
     /*ui.readFileIntoJTable(q);*/
     } else {
     return false;
     return true;
     } // openFile
     boolean saveFile () {
          File file = null;
          JFileChooser fc = new JFileChooser ();
          // Start in current directory
          fc.setCurrentDirectory (new File ("."));
          // Set filter for Java source files.
          fc.setFileFilter (fJavaFilter);
          // Set to a default name for save.
          fc.setSelectedFile (fFile);
          // Open chooser dialog
          int result = fc.showSaveDialog (this);
          if (result == JFileChooser.CANCEL_OPTION) {
          return true;
          } else if (result == JFileChooser.APPROVE_OPTION) {
          fFile = fc.getSelectedFile ();
          if (fFile.exists ()) {
          int response = JOptionPane.showConfirmDialog (null,
          "Overwrite existing file?","Confirm Overwrite",
          JOptionPane.OK_CANCEL_OPTION,
          JOptionPane.QUESTION_MESSAGE);
          if (response == JOptionPane.CANCEL_OPTION) return false;
          return ui.getJTableFields(fFile);
          else{
          return false;
          } // saveFile
     public Object readFile (File file) {
          try{
               FileInputStream fis = new FileInputStream(file);
               ObjectInputStream ois = new ObjectInputStream(fis);
               v = ois.readObject();
               fis.close();
          catch(Exception e){
               System.err.println("Exception:" + e.getMessage());
          return (v);
public static void main(String[] args)
     PowerFrame PF = new PowerFrame();
     PF.pack();
     PF.setSize(765,690);
     PF.setBackground(Color.white);
     PF.setVisible(true);
package tables;
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
public class BusbarsUI extends JPanel implements TableModelListener {
     private boolean DEBUG = true;
private int xcount;
private int ycount;
private int pcount;
private int qcount;
private int y;
private TableModel newmodel;
JTable table;
     BusbarRecords Busbar=new BusbarRecords();
public BusbarsUI() {
     init();
public void init(){
     DefaultTableModel model = new DefaultTableModel();
     model.addTableModelListener( this );
     JTable table = new JTable(model);
     setLayout(new BorderLayout());
     setBackground(Color.white);
     Vector p = Busbar.setJTableFields();
String[] s = initializevector();
System.out.println(p.size());
     for (xcount=1; xcount <= Busbar.columnNames.length;xcount++)
          model.addColumn(Busbar.columnNames [xcount-1]);
     for (qcount=1; qcount <= 5; qcount++)
     model.addRow(s);
          pcount=1;
     while (pcount < (p.size()-1))
          for (ycount=1; ycount <= p.size()/5; ycount++)
               for (xcount=1; xcount <= Busbar.columnNames.length;xcount++)
                    model.setValueAt(p.elementAt(pcount-1), ycount-1, xcount-1);
                    pcount++;
     model.addRow(new Object[]{""});
for (pcount=0; pcount <= p.size()-1; pcount++)
     System.out.println(p.elementAt(pcount));
table.setPreferredScrollableViewportSize(table.getPreferredSize());
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane, BorderLayout.CENTER);
public void tableChanged(TableModelEvent e)
          System.out.println(e.getSource());
          if (e.getType() == TableModelEvent.UPDATE)
               int row = e.getFirstRow();
               int column = e.getColumn();
                    TableModel model = table.getModel();
                    model.getValueAt(row,column);
                    Vector g = new Vector();
                    for(int i=0; i < model.getRowCount();i++){
                         for(int j=0;j < model.getColumnCount();j++){
                              g.addElement(model.getValueAt(i,j));
private void stopEditing() {
     if (table.getCellEditor() != null)
     table.getCellEditor().stopCellEditing();
private String[] initializevector()
     String[] v = new String[5];
     for (int i=0; i<5;i++)
          v="";
     return v;
     /* public JTable update()
          for (xcount=1; xcount <= Busbar.columnNames.length;xcount++)
               for (qcount=1; qcount <= 5; qcount++)
                    System.out.println(model.getValueAt(ycount-1, xcount-1));
          JTable table = new JTable(model);
          return table;
/* public JTable readFileIntoJTable(Object q)*/
public boolean getJTableFields(File file)
     Vector g = new Vector();
     stopEditing();
     /*for(int i=0; i < model.getRowCount();i++){
          for(int j=0;j < model.getColumnCount();j++){
               g.addElement(model.getValueAt(i,j));
     int numRows=model.getRowCount();
     int numCols= model.getColumnCount();
System.out.println("Value of data: ");
for (int i=0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j=0; j < numCols; j++) {
System.out.print(" " + table.getValueAt(i, j));
System.out.println();
System.out.println("--------------------------");*/
try
          FileOutputStream fos = new FileOutputStream(file);
          ObjectOutputStream object = new ObjectOutputStream(fos);
          object.writeObject(g);
          object.flush();
          object.close();
     catch(Exception ex)
          System.out.println("Exception:" + ex);
          return false;
          return true;
package tables;
import java.io.*;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import java.util.Vector;
public class BusbarRecords implements Serializable
private String firstName, lastName, sport;
private int years;
private boolean vegetarian;
private int xcount;
private int ycount;
private int pcount;
private int y;
private PowerFrame PR;
File file;
String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
Object [][] data = {
{"Mary", "Campione",
"Snowboarding", new Integer(5), new Boolean(false)},
{"Alison", "Huml",
"Rowing", new Integer(3), new Boolean(true)},
{"Kathy", "Walrath",
"Chasing toddlers", new Integer(2), new Boolean(false)},
{"Mark", "Andrews",
"Speed reading", new Integer(20), new Boolean(true)},
{"Angela", "Lih",
"Teaching high school", new Integer(4), new Boolean(false)}
     public Vector setJTableFields(){
          Vector p = new Vector();
     for (ycount =1; ycount <=5; ycount++)
          for(xcount=1; xcount <= columnNames.length; xcount++)
               p.add("one");
     return p;
package tables;
import javax.swing.*;
import java.io.*;
/** Filter to work with JFileChooser to select java file types. **/
public class JavaFilter extends javax.swing.filechooser.FileFilter
public boolean accept (File f) {
return f.getName ().toLowerCase ().endsWith (".java")
|| f.isDirectory ();
public String getDescription () {
return "Java files (*.java)";
} // class JavaFilter

Answer 1

brilliant thanks Dr Clap thats just what i was looking for - ive been wasting time searching thru thr ROME and Informa API's for a way of doing this before realising that i just need to write the URL's into a file and the read from them !!