Repaint problem. Paint two components at different times.

Question

I have two labels on a panel. I want to paint them one by one after some action. However, I found that even I call the repaint method of the first label and after some time call the repaint method of the second label, stilll they change at the same time. The first label will wait until the second label repaints.
Below is my code:
import java.awt.event.*;
import javax.swing.*;
public class PaintTest extends JPanel {
     JButton paintButton = new JButton("paint");
     JLabel labelOne = new JLabel("Paint first");
     JLabel labelTwo = new JLabel("Paint second");
     public PaintTest() {
          add (paintButton);
          add (labelOne);
          add (labelTwo);
          paintButton.addActionListener(new ActionListener() {
               public void actionPerformed (ActionEvent evt) {
                    paintButton_actionPerformed (evt);               
     void paintButton_actionPerformed(ActionEvent evt) {
          labelOne.setText("first");
          labelOne.repaint();
          labelOne.revalidate();
          this.repaint();
          this.revalidate();          
          // wait for some time.
          for (long i = 0; i < 99999999; i++) {
          labelTwo.setText("second");
          labelTwo.repaint();
     public static void main(String[] args) {
          JFrame f = new JFrame();
          f.setContentPane(new PaintTest());
          f.pack();
          f.show();
}

Answer 1

The reason its not being updated is because ur not realeasing ur current thread, ur making it work - the time it waits is actually working, so ur not allowing the painting thread to cut in and do the painting. Try this instead:
Implement runnable with:
public void run() {
for (long i = 0; i < 99999999; i++) {}
     labelTwo.setText("second");
     labelTwo.repaint();
     repaint();
     revalidate();
}and in ur actionPerformed:
labelOne.setText("first");
labelOne.repaint();
labelOne.revalidate();
repaint();
revalidate();
SwingUtilities.invokeLater(this);This will give the paiting thread time to repaint before u do u waiting-work....
Stig.