Urgent : newly added columns copying each other

Question

I am adding columns to jtable. And then moving it to required postion.
But whenever I edit those columns all the newly added columns and the first column reflects those changes. ie whatever I enter in the new columns, it appears in all newly added columns and the first column as well. I am using new instance of column each time so whats wrong I am doing here.
EditableHeaderTableColumn ncol = new EditableHeaderTableColumn();
TableColumnModel columns = table.getColumnModel();
int c = table.getSelectedColumn();
columns.addColumn(ncol);
columns.moveColumn(i-1, c+1);

Answer 1

the column header has a combobox and user can enter his own value as well if reqd.
I will check ur code at work later and see whats happenning.
But is editable header a problem?
thanks
to tjacobs01 : I didn't get your question. could you please elaborate a little.
What's you EditableHeaderTableColumn class do? Do you
allow the user to modify the column header value?
Anyway, here's an example that adds columns as you
appear to want to, check it oput ans see if there are
any steps you missed in your code.
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JTable;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import javax.swing.table.TableColumn;
import javax.swing.table.AbstractTableModel;
public class TableColumnTest
     static int sColumnCount= 4;
     public static void main(String[] argv)
final JTable table= new JTable(new
w AbstractTableModel() {
               public String getColumnName(int column) {
                    return "C" +column;
               public int getColumnCount() {
                    return sColumnCount;
               public int getRowCount() {
                    return 10;
               public Object getValueAt(int row, int column) {
                    return "(" +row +"," +column +")";
          final JTextField field= new JTextField("2", 2);
          JButton btn= new JButton("Add column at position");
          btn.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent e) {
                    int position;
                    try {
                         position= Integer.parseInt(field.getText());
                    catch (NumberFormatException nfe) {
                         position= sColumnCount;
                    position= Math.min(position, sColumnCount);
                    field.setText(String.valueOf(position));
TableColumn column= new
new TableColumn(sColumnCount);
                    column.setHeaderValue(
                         table.getModel().getColumnName(sColumnCount));
                    table.getColumnModel().addColumn(column);
table.getColumnModel().moveColumn(sColumnCount,
nt, position);
                    sColumnCount++;
          JPanel panel= new JPanel(new BorderLayout());
          panel.add(btn, BorderLayout.CENTER);
          panel.add(field, BorderLayout.EAST);
          JPanel container= new JPanel(new BorderLayout());
          container.add(panel, BorderLayout.WEST);
          JFrame frame= new JFrame("TableColumnTest");
frame.getContentPane().add(container,
, BorderLayout.NORTH);
frame.getContentPane().add(new JScrollPane(table),
, BorderLayout.CENTER);
          frame.pack();
          frame.setDefaultCloseOperation(3);
          frame.setVisible(true);