How to change an existing JScrollPane table

Question

Hi there,
I have defined a JScrollPane panel. I call the class "NorthCenterPanel " this the first time with "defaultPanel". This shows me a correct table. Next time I calle the same class from the class=Listen(see below) with "createPanel", because I want to change the table.
This I cannot get to work. When the new table is shown I have to click on the JScrollPane to have it to change the table of which is done, but the column names do not change.
Any suggestions?
Thanks
Geir
public class NorthCenterPanel extends JPanel
public NorthCenterPanel(String newPanel)
System.out.println("Function=" + newPanel);
if (newPanel == "defaultPanel")
colNames [0] = "Logon-ID";
     colNames [1] = "Name ";
     colNames [2] = "Not Used ";
     outData [0][0] = "login ";
     outData [0][1] = "Jogn Doe";
     outData [0][2] = "NotWorking";
title = BorderFactory.createTitledBorder(outArea);
setBorder(title);
     System.out.println("NortCenterPanel...." + outArea);
     table = new JTable(outData, colNames);
     table.setPreferredScrollableViewportSize(new Dimension(200,100));
     table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
     table.setBackground(new Color(252,255,240));
     outPut = new JScrollPane(table);
     add(outPut);
     }else if (newPanel == "createPanel") {
     colNames [0] = "Next ID ";
     colNames [1] = "Full Name";
     colNames [2] = "Reserved ";
     outData [0][0] = "logout";
     outData [0][1] = "Jane Doe";
     outData [0][2] = "N/A ";
     System.out.println("NortCenterPanel...." + outArea);
     System.out.println("her er jeg....");
     table = new JTable(outData, colNames);
     outPut.add(table);
pack();
public class Listen implements ActionListener
public void actionPerformed(ActionEvent e)
if (e.getSource() == updateButton)
createButton.setSelected(false);
deleteButton.setSelected(false);
outPut.remove(table);
add(new NorthCenterPanel("createPanel"));
table.repaint();
outPut.revalidate();
}

Answer 1

1) Use the "Code" formatting tags when posting code so the code is readable
2) In the future, Swing related quesitons should be posted in the Swing forum.
3) don't use "==" to compare Objects, use the equals(...) method
In general, when you add or remove a compont from a panel then you need to revalidate() the panel.
The easiest way to replace a table it to simply replace the data in the table. So you just do something like:
DefaultTableModel model = new DefaultTableModel(....);
table.setModel(...);
Now there is no need to remove and add the component or revalidate the panel.