How to display a modal message while processing in a thread.

Question

I have difficulty in display a modal dialog while in processing in a background.
I have created the following class.
package fedex.screen.component;
import java.awt.*;
// This infobox is a modal dialog which display static text and stay
// on screen without blocking proceeding code from execution and can
// only close by issuing close method.
public class ProcessInfoBox implements Runnable
     // Display dialog box
     private InfoBox dialog = null;
     // Thread to enable showing of Dialog Box
     private Thread thread = new Thread(this);
     // Determine if to close dialogbox
     private boolean isFinish = false;
     public ProcessInfoBox(Frame frame) {
          dialog = new InfoBox(frame,"Performing Operation","Processing...");
thread.setPriority(Thread.MAX_PRIORITY);
     public void setTitle(String title) {
          dialog.setTitle(title);
     public void setText(String text) {
          dialog.getMessageLbl().setText(text);
     // The reference return will be ProcessInfoBox.InfoBox
     public InfoBox getInfoBox() {
          return dialog;
     // Thread method
     public void run() {
          dialog.setVisible(true);
          // If true return from thread and exit.
          while ( isFinish == false )
               try
                    Thread.sleep(500); // 500 msec
               catch ( InterruptedException e )
     // Start showing dialog
     final public void show() {
          thread.start();
          isFinish = false;
     final public void hide() {
          isFinish = true;
          dialog.setVisible(false);
     // Dialog box which show text.
     public class InfoBox extends Dialog
          private Label messageLbl = new Label("Processing ...");
          public InfoBox(Frame frame, String title, String message) {
               super(frame,title,true);
               initInfoBox();
          public Label getMessageLbl() {
               return messageLbl;
          private void initInfoBox() {
               setLayout(new BorderLayout());
               add(messageLbl,BorderLayout.CENTER);
               setSize(250,150);
FormUtility.centerForm(this);
     public static void main(String[] args) {
          Frame frame = new Frame("BigMac");
          frame.setSize(600,600);
          frame.setVisible(true);
          ProcessInfoBox box = new ProcessInfoBox(frame);
          box.show();
          for ( int i = 1; i < 10000; i++ )
               System.out.println(i);
          box.hide();
To test the code I used the following section to test
The main method in the class is used. In the simple
example, the message did correctly update itself while
i is increment. However, when I try on more complex
application, the message just stalk there without
updating itself as it is hanging.
I have try to set piority to highest but without effect.
Is there anything to rectify the situation
thank

Answer 1

The "please wait" dialog is a modal dialog. When u
show it, the following code can not executed!
That's the problem