My JTable Column is not removing?

Question

public class  ClassA extends JPanel
    private DefaultTableModel model = new DefaultTableModel();
    private JTable table = new JTable(model);
     public ClassA ()
     {  this.add(new Table1Panel() );
     public class Table1Panel extends JPanel
     {  clearTable();
        model.addColumn("col1");
        //add 5 rows
     public class Table2Panel extends JPanel
     {  clearTable();
        model.add("col2");
        //add 10 rows
     public void clearTable()
        while(model.getRowCount() != 0)
            model.removeRow(0);
        while(table.getColumnModel().getColumnCount() != 0)
            table.removeColumn(table.getColumnModel().getColumn(0));
}I've been researching for days and I can't seem to figure out interfacing with JTable.
How my program is supposed to work - program starts with Table1Panel. When a button is clicked, everything in Table1Panel should be removed and the variables, table and model, are supposed to be cleansed of all rows, data, and columns and Table2Panel is to be displayed with just "col2".
The problem: When the button is clicked, the columns in the table are never removed and the table displays as "col1 | col2" when it should only be "col2". If I click that button a second time, it will display as "col1 | col2 | col2".
This is the logic i use to removeColumns. What am I not understanding?
while(table.getColumnModel().getColumnCount() != 0)
table.removeColumn(table.getColumnModel().getColumn(0));

Answer 1

I think I found your problem, it can be demonstarted in the code below:
You kept adding more and more columns to your model. even though you took the columns away from your JTable because you added columns to your model and made your tables based on that model the columns just kept getting bigger and bigger. Every time you called new table1 or new table2 you added 2 more columns... Test this theory out, this is what I did with your code.
Not sure this is exactly what you want, but if it needs to do something different for a specific reason let me know and we can play around with it more..
Only thing about this, not sure if you want it this way or not is that it holds the users imput when switching back and forth.
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.table.DefaultTableModel;
public class ClassA extends JPanel
    private DefaultTableModel model1 = new DefaultTableModel();
    private JTable qtable1 = new JTable(model1);
    private DefaultTableModel model2 = new DefaultTableModel();
    private JTable qtable2 = new JTable(model2);
    private JButton jbButton1 = new JButton ("View Table1");
    private JButton jbButton2 = new JButton ("View Table2");
    private Boolean DEBUG = true;
    JPanel panel = new JPanel();
    public ClassA ()
         //Setup table 1
        model1.addColumn("col1");
        model1.addColumn("col2");
        for (int i=0; i<5; i++)
        { model1.addRow(new Object[]{null,null});  }
        qtable1.getColumnModel().getColumn(0).setPreferredWidth(600);
        qtable1.getColumnModel().getColumn(1).setPreferredWidth(200);
        qtable1.setRowHeight(20);
        qtable1.setPreferredScrollableViewportSize(new Dimension(500,500));
        //Setup table 2
        model2.addColumn("col3");
        model2.addColumn("col4");
        for (int i=0; i<5; i++)
         model2.addRow(new Object[]{null,null});
        qtable2.getColumnModel().getColumn(0).setPreferredWidth(600);
        qtable2.getColumnModel().getColumn(1).setPreferredWidth(200);
        qtable2.setRowHeight(20);
        qtable2.setPreferredScrollableViewportSize(new Dimension(500,500));
        this.setLayout(new FlowLayout());
        panel.add(new table1());
        this.add(panel);
        this.add(jbButton1);
        this.add(jbButton2);
        jbButton1.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                System.out.println("1");
                panel.removeAll();
                panel.add(new table1());
                panel.revalidate();
                repaint();
        jbButton2.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e)
                System.out.println("2");
                panel.removeAll();
                panel.add(new table2());
                panel.revalidate();
                repaint();
private class table1 extends JPanel
    public table1 ()
    {    //qtable.setFillsViewportHeight(false);
            JScrollPane scrollPane = new JScrollPane(qtable1);
            this.add(scrollPane);
private class table2 extends JPanel
       public table2()
         //qtable.setFillsViewportHeight(false);
            JScrollPane scrollPane = new JScrollPane(qtable2);
            this.add(scrollPane);
    public static void main (String[] args)
        JFrame frame = new JFrame("Test ImportQuestionPanel");
        frame.getContentPane().add(new ClassA());
        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}