Problem displaying table (JTABLE), can u help me?

Question

Hi 2 all.
I'm beginer in java (I have expirience of some yoears developing in pro-C, but not java).
I try to create some JDialog using Intellig Idea7. There I create JTable component, try to initialize it with values in the array (that was inialized before)
(ex:
JTable table1 = new JTable(data_string_array, row_names_array);
The problem is when I try to make & run application, there is nothing displayed.
On "debug prints" ( print(table1.getValueAt(0,0)); ) where I try to print values of the table - everything is right. it print right values, but then aren't displayed on the dialog window.
What could be a problem?
here is example of the code:
import javax.swing.*;
import java.awt.event.*;
* Created by IntelliJ IDEA.
* User: db2admin
* Date: Jul 10, 2008
* Time: 11:53:43 AM
* To change this template use File | Settings | File Templates.
public class frame1 extends JFrame{
private JPanel contentPane;
private JButton buttonOK;
private JButton buttonCancel;
private JTable table1;
private JScrollPane scrollpane;
public frame1 ()
contentPane = new JPanel();
setContentPane(contentPane);
getRootPane().setDefaultButton(buttonOK);
// Create table data:
Object[][] data_matrix = {
{"one", "two"},
{"five", "six"},
{"nine", "ten"},
Object[] row_names = {"1row1", "2row2"};
// create new table instance
table1 = new JTable(data_matrix, row_names);
scrollpane = new JScrollPane(table1);
System.out.println("this print");
buttonOK.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
onOK();
buttonCancel.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
onCancel();
// call onCancel() when cross is clicked
setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
onCancel();
// call onCancel() on ESCAPE
contentPane.registerKeyboardAction(new ActionListener()
public void actionPerformed(ActionEvent e)
onCancel();
}, KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
private void onOK()
// add your code here
//dispose();
private void onCancel()
// add your code here if necessary
dispose();
public static void main(String[] args)
frame1 dialog = new frame1();
dialog.pack();
dialog.setVisible(true);
System.out.println("This is other print");
//JTableDemo demo = new JTableDemo();
//System.exit(0);
P.S. Other question: what principal difference in creating simple forms as JFrame or JDialog?

Answer 1

Hi!
Well, I don't know what IntellyJ makes, but
1) I can't see where the buttons are created, so addActionListener throws NPE.
2) I can't see where the scrollPane is added to the contentPane
Andras_