FireTableDataChanged() doesnt update?

Question

When I in my ActionListener try to update mu JTable by fireTableDataChanged() nothing happens? Can anyone help me with this?
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.swing.table.*;
import java.text.*;
class Kalender extends JFrame implements ActionListener
Container contentPane = getContentPane();
JScrollPane scrollPane;
     JTable table;
     MyTableModel myModel;
     JButton back = new JButton("<<");
     JButton forward = new JButton(">>");
     JLabel frem = new JLabel();     
Icon fremIcon= new ImageIcon(this.getClass().getResource("frem.gif"));
JLabel tilbage = new JLabel();
     Icon tilbageIcon = new ImageIcon(this.getClass().getResource("tilbage.gif"));
     Kalender()
          contentPane.setLayout(null);
myModel = new MyTableModel();
table = new JTable(myModel);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
DefaultTableCellRenderer tcrColumn = new DefaultTableCellRenderer();
tcrColumn.setHorizontalAlignment(JTextField.CENTER);
table.getColumnModel().getColumn(0).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(1).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(2).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(3).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(4).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(5).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(6).setCellRenderer(tcrColumn);
//table.getColumnModel().getColumn(7).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(0).setPreferredWidth(80);
table.getColumnModel().getColumn(1).setPreferredWidth(80);
table.getColumnModel().getColumn(2).setPreferredWidth(80);
table.getColumnModel().getColumn(3).setPreferredWidth(80);
table.getColumnModel().getColumn(4).setPreferredWidth(80);
table.getColumnModel().getColumn(5).setPreferredWidth(80);
table.getColumnModel().getColumn(6).setPreferredWidth(80);
//table.getColumnModel().getColumn(7).setPreferredWidth(80);
table.setRowHeight(50);
scrollPane = new JScrollPane(table);
scrollPane.setBounds(20,20,604,330);
getContentPane().add(scrollPane);
back.setBounds(280,400,50,20);
back.addActionListener(this);
contentPane.add(back);
forward.setBounds(340,400,50,20);
forward.addActionListener(this);
contentPane.add(forward);
public void actionPerformed( ActionEvent e )
     if(e.getSource()==back)
          myModel.maaned--;          
          myModel.fireTableDataChanged();           
          System.out.println(myModel.maaned);
     if(e.getSource()==forward)
          myModel.maaned++;
     myModel.fireTableDataChanged();
     System.out.println(myModel.maaned);
class MyTableModel extends AbstractTableModel
final String[] columnNames = {//"Uge",
     "Mandag",
"Tirsdag",
"Onsdag",
"Torsdag",
"Fredag",
"L�rdag",
"S�ndag"};
final Object[][] data=new Object[6][7];
     int aarTaeller=0;
int maanedTaeller=0;
int maaned=0;
MyTableModel()
Calendar calendar = new GregorianCalendar();
int aar = calendar.get(calendar.YEAR+aarTaeller);
maaned = (calendar.get(calendar.MONTH)+maanedTaeller);
Calendar c = new GregorianCalendar(aar,maaned,1);
int dageMaaned = c.getActualMaximum(c.DAY_OF_MONTH);
int dageUge=0;
int dageUge2 = (c.get(c.DAY_OF_WEEK));
int ugeAar = c.get(c.WEEK_OF_YEAR);
SimpleDateFormat sdf = new SimpleDateFormat( "EEEE" );
String dagNavn = sdf.format( c.getTime());
if(dagNavn.equals("mandag")) dageUge=0;
if(dagNavn.equals("tirsdag")) dageUge=1;
if(dagNavn.equals("onsdag")) dageUge=2;
if(dagNavn.equals("torsdag")) dageUge=3;
if(dagNavn.equals("fredag")) dageUge=4;
if(dagNavn.equals("l�rdag")) dageUge=5;
if(dagNavn.equals("s�ndag")) dageUge=6;
System.out.println("maaned "+maaned);
System.out.println("uge dag "+dageUge);
System.out.println("uge dag "+dageUge2);
System.out.println("dage maaned "+dageMaaned);
System.out.println("dag navn "+dagNavn);
     int taeller=1;
int taeller2=0;
          for(int i=0;i<6;i++)
               int ii = 0;
          if(taeller2<dageUge)// MANDAG
               data[i][ii] ="";
          ii++;          
          if(taeller==dageMaaned)break;
          taeller2++;               
          else
               data[i][ii] =""+taeller;
          ii++;          
          if(taeller==dageMaaned)break;
          taeller++;
          taeller2++;               
          if(taeller2<dageUge)// TIRSDAG
               data[i][ii] ="";
          ii++;          
          if(taeller==dageMaaned)break;
          taeller2++;               
          else
               data[i][ii] =""+taeller;
          ii++;          
          if(taeller==dageMaaned)break;
          taeller++;
          taeller2++;               
          if(taeller2<dageUge)// ONSDAG
               data[i][ii] ="";
          ii++;          
          if(taeller==dageMaaned)break;
          taeller2++;               
          else
               data[i][ii] =""+taeller;
          ii++;          
          if(taeller==dageMaaned)break;
          taeller++;
          taeller2++;               
          if(taeller2<dageUge)// TORSDAG
               data[i][ii] ="";
          ii++;          
          if(taeller==dageMaaned)break;
          taeller2++;               
          else
               data[i][ii] =""+taeller;
          ii++;          
          if(taeller==dageMaaned)break;
          taeller++;
          taeller2++;               
          if(taeller2<dageUge)// FREDAG
               data[i][ii] ="";
          ii++;          
          if(taeller==dageMaaned)break;
          taeller2++;               
          else
               data[i][ii] =""+taeller;
          ii++;          
          if(taeller==dageMaaned)break;
          taeller++;
          taeller2++;               
          if(taeller2<dageUge)// L�RDAG
               data[i][ii] ="";
          ii++;          
          if(taeller==dageMaaned)break;
          taeller2++;               
          else
               data[i][ii] =""+taeller;
          ii++;          
          if(taeller==dageMaaned)break;
          taeller++;
          taeller2++;               
          if(taeller2<dageUge)// S�NDAG
               data[i][ii] ="";
          ii++;          
          if(taeller==dageMaaned)break;
          taeller2++;               
          else
               data[i][ii] =""+taeller;
          ii++;          
          if(taeller==dageMaaned)break;
          taeller++;
          taeller2++;               
          for(int i=0;i<5;i++)
               data[0] =""+ugeAar;
               ugeAar++;
               if(ugeAar==52)
                    ugeAar=1;
public int getColumnCount()
return columnNames.length;
public int getRowCount()
return data.length;
public String getColumnName(int col)
return columnNames[col];
public Object getValueAt(int row, int col)
return data[row][col];
public boolean isCellEditable(int row, int col)
     return true;
public void setValueAt(Object value, int row, int col)
data[row][col] = value;
fireTableCellUpdated(row, col);
fireTableDataChanged();      

Answer 1

Kalender()
contentPane.setLayout(null);
myModel = new MyTableModel();
You've done it here on the above line.
What error are you getting now?