JTabbedPane content inserted at selection time

Question

Hi,
I have a jtabbedpane with a few tabs. I want to insert the content of each tab at selection time. That means by default the content of the first tab is inserted. When I select the next tab it should retreive data from a DB and update this selected tab. But I can't do it. In my current implementation I load all data in all tabs at start time. But since the amount of data is large it takes a lot of time till the tabbedpane is visible.
Is there anyone who can help me with this.
Thanks in advance
grkh

Answer 1

Hi,
add ChangeListener on the JTabbedPane and listen for stateChanged event. look at the following example:
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
public class TestFrame extends JFrame
  JTabbedPane jTabbedPane1 = new JTabbedPane();
  JPanel jPanel1 = new JPanel();
  JPanel jPanel2 = new JPanel();
  public TestFrame()
    try
      jbInit();
    catch(Exception e)
      e.printStackTrace();
  public static void main(String[] args)
    (new TestFrame()).show();
  private void jbInit() throws Exception
    this.setTitle("Test Frame");
    this.addWindowListener(new java.awt.event.WindowAdapter()
      public void windowClosing(WindowEvent e)
        this_windowClosing(e);
    this.setSize(450, 350);
    jTabbedPane1.addChangeListener(new javax.swing.event.ChangeListener()
      public void stateChanged(ChangeEvent e)
        jTabbedPane1_stateChanged(e);
    this.getContentPane().add(jTabbedPane1, BorderLayout.CENTER);
    jTabbedPane1.add(jPanel1, "jPanel1");
    jTabbedPane1.add(jPanel2, "jPanel2");
  void this_windowClosing(WindowEvent e)
    dispose();
    System.exit(0);
  void jTabbedPane1_stateChanged(ChangeEvent e)
    System.out.println("Tab Index: " + jTabbedPane1.getSelectedIndex());
}