Rebuilding JTable

Question

I'm trying to build a table by first selecting a table name. then i press a button and the table appears. When i change the table name and press the button again the table doesn't change. What is going wrong????
Here's the code:
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
import javax.swing.JInternalFrame;
public class IPMAC extends JInternalFrame {
     private Connection connection;
private Statement statement;
     private ResultSet resultSet;
     String selectedGroep;
     private JTable table;
     private int AAP = 1;
static final int xOffset = 480, yOffset = 10;
     int y, // De y waarde declareren
x; // De x waarde declareren
private JComboBox groepKeuze;
Vector result;
JDesktopPane desktop;
     public IPMAC()
     throws
                    ClassNotFoundException,
                    SQLException,
                    IllegalAccessException,
                    InstantiationException{
super("IP MAC",
          false, //resizable
     true, //closable
     false, //maximizable
     true);//iconifiable
          //Set up the GUI.
desktop = new JDesktopPane(); //a specialized layered pane
setContentPane(desktop);
//Set the window's location.
setLocation(xOffset, yOffset);
final String url = "jdbc:mysql://localhost/IPMAN";
          final String username = "";
          final String password = "";
          Class.forName("org.gjt.mm.mysql.Driver").newInstance();
     connection = DriverManager.getConnection( url, username, password );
     Label label1 = new Label();
     Label label2 = new Label();
     Label label3 = new Label();
     final TextField macadresveld = new TextField();
     final TextField ipadresveld = new TextField();
     Button button1 = new Button();
     Button button2 = new Button();
     Button button3 = new Button();
          label1.setText("MAC Adres");
          getContentPane().add(label1);
          label1.setBounds(370,60,70,25);
          label2.setText("IP Adres");
          getContentPane().add(label2);
          label2.setBounds(370,110,70,25);
          label3.setText("Groepnaam");
          getContentPane().add(label3);
          label3.setBounds(370,160,70,25);
          getContentPane().add(macadresveld);
          macadresveld.setBounds(440,60,156,20);
          getContentPane().add(ipadresveld);
          ipadresveld.setBounds(440,110,156,20);
          button1.setLabel("Koppel MAC");
          getContentPane().add(button1);
          button1.setBackground(java.awt.Color.lightGray);
          button1.setBounds(506,10,90,25);
          button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
               JOptionPane.showMessageDialog
               ( null, "MAC Adres is being added...", "Updating...",     JOptionPane.INFORMATION_MESSAGE);
try {
          Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" );
          connection = DriverManager.getConnection( url, username, password );
          Statement stmt = connection.createStatement();
          int numUpdated01 = stmt.executeUpdate("UPDATE ip SET MacAdres = '" + macadresveld.getText() + "' WHERE IpAdres = '" + ipadresveld.getText() + "' ");
          connection.close();
          catch ( ClassNotFoundException cnfex )
          System.err.println(
     "Failed to load JDBC/ODBC driver." );
          cnfex.printStackTrace();
          System.exit( 1 ); // terminate program
          catch ( SQLException sqlex )
          System.err.println( "Unable to connect" );
          sqlex.printStackTrace();
               JOptionPane.showMessageDialog
               ( null, "Data has been updated...", "Updated...",     JOptionPane.INFORMATION_MESSAGE);
          button2.setLabel("Save / Exit");
          getContentPane().add(button2);
          button2.setBackground(java.awt.Color.lightGray);
          button2.setBounds(506,300,90,25);
          button2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setVisible(false);
dispose();
          button3.setLabel("View Data");
          getContentPane().add(button3);
          button3.setBackground(java.awt.Color.lightGray);
          button3.setBounds(506,265,90,25);
          button3.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent e) {
                         System.out.println("de gekozen Groep is:" + selectedGroep);
                         try     {
                    getTable();
                         catch(Exception ex)     { }
groepKeuze = new JComboBox(getContents());
groepKeuze.setMaximumRowCount(4);
     groepKeuze.setBounds(440,160,156,20);
groepKeuze.setBackground(java.awt.Color.white);
     getContentPane().add( groepKeuze );
groepKeuze.addItemListener(new ItemListener() {
     public void itemStateChanged( ItemEvent e ) {
          selectedGroep = groepKeuze.getSelectedItem().toString();
          System.out.println( "de gekozen Groep is:" + selectedGroep );
     setSize(616,370);
          show();
          private Vector getContents()
          throws
          ClassNotFoundException,
          SQLException,
          IllegalAccessException,
          InstantiationException
               Connection connection;
          Statement statement;
               ResultSet resultSet;
     final String url = "jdbc:mysql://localhost/IPMAN";
               final String username = "";
               final String password = "";
               Class.forName("org.gjt.mm.mysql.Driver").newInstance();
          connection = DriverManager.getConnection( url, username, password );
               result = new Vector();
               String query = "SELECT DISTINCT Groep FROM ip";
          statement = connection.createStatement();
          resultSet = statement.executeQuery( query );
               while (resultSet.next()) {
               result.addElement(resultSet.getString("Groep"));
          statement.close();
          return result;
     private void getTable()     throws
          ClassNotFoundException,
          SQLException,
          IllegalAccessException,
          InstantiationException
Statement statement;
ResultSet resultSet;
String query = "SELECT NetwerkAdres,IpAdres,KlasseNetwerk,Groep FROM ip WHERE Groep = '" + selectedGroep + "'";
statement = connection.createStatement();
resultSet = statement.executeQuery( query );
displayResultSet( resultSet );
statement.close();
selectedGroep = "";
private void displayResultSet( ResultSet rs )
     throws
          ClassNotFoundException,
          SQLException,
          IllegalAccessException,
          InstantiationException {
boolean moreRecords = rs.next();
if ( ! moreRecords ) {
JOptionPane.showMessageDialog( this,
"ResultSet contained no records" );
setTitle( "No records to display" );
return;
Vector columnHeads = new Vector();
Vector rows = new Vector();
ResultSetMetaData rsmd = rs.getMetaData();
for ( int i = 1; i <= rsmd.getColumnCount(); ++i )
columnHeads.addElement( rsmd.getColumnName( i ) );
do {
rows.addElement( getNextRow( rs, rsmd ) );
} while ( rs.next() );
table = new JTable( rows, columnHeads );
JScrollPane scroller = new JScrollPane( table );
getContentPane().add(scroller);
          scroller.setBounds(0,0,370,325);
validate();
private Vector getNextRow( ResultSet rs,
ResultSetMetaData rsmd )
     throws     ClassNotFoundException,
               SQLException,
               IllegalAccessException,
                    InstantiationException{
Vector currentRow = new Vector();
for ( int i = 1; i <= rsmd.getColumnCount(); ++i )
switch( rsmd.getColumnType( 1 ) ) {
case Types.VARCHAR:
currentRow.addElement( rs.getString( i ) );
break;
case Types.INTEGER:
currentRow.addElement(
new Long( rs.getLong( 1 ) ) );
break;
default:
System.out.println( "Type was: " +
rsmd.getColumnTypeName( i ) );
return currentRow;
Could somebody try to answer this question???
thanks!!

Answer 1

try
table.getModel().fireTableStructureChanged();
where you have the validate() line just to see.. I've never actually created a new JTable for every new display, I just manipulate the models and then run the fireTableDataChanged() or fireTableStructureChanged() methods.. That takes care of all this stuff automatically, and I think that'd be a more efficient way of doing things..
If THAT doens't work, then I'd be suspicious of your scrollpane not redrawing itself.. Do a System.out.println( (String)table.getValueAt(1,1) ); and see if the table actually has the new values or not.. If it DOES but it's not on screen, then you know this is the case.. Then I'd try scroller.revalidate() and scroller.repaint().
doug