Wait_cursor still does not show...

Question

Hi all!
I'm simply trying to have the wait_cursor showing when event is thrown (for instance when mouse is clicked). I've tried to use the glassPane technique (as often recommended in this forum), but my code doesn't run as expected:
In the following button_mouseClicked method, I set the glassPane visible and set the cursor to wait_cursor.
But the wait_cursor only appears after the loops hava been run !?!?
Can somebody please tell me exactly how those cursors work !?...
Thanks in advance...
Mich
// Here's my test code...
//===================================================
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class testCursor extends JFrame
Container cp;
Component gp;
JButton button;
MyMouseListener mml = new MyMouseListener();
public testCursor()
cp = getContentPane();
gp = getGlassPane();
gp.addMouseListener(mml);
cp.setLayout(null);
button = new JButton("click");
button.setBounds(100,100,150,50);
button.addMouseListener(mml);
cp.add(button);
setSize(600,400);
class MyMouseListener extends MouseAdapter
public void mouseClicked(MouseEvent e)
Object source = e.getSource();
if (source == button)
button_mouseClicked(e);
else if (source == gp)
gp_mouseClicked(e);
public void button_mouseClicked(MouseEvent e)
gp.setVisible(true);
gp.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
//===============================================================
//===============================================================
// THE WAIT_CURSOR APPEARS ONLY AFTER LOOPS HAVE BEEN RUN => ????
// (AND SOMETIMES ONLY WHEN MOUSE IS MOVED ...)
//===============================================================
//===============================================================
String sss = null;
for (int i=0; i<1000; i++){
for (int j=0; j<1000; j++){
sss = ""+i;
button.setText(sss);
public void gp_mouseClicked(MouseEvent e){}
public static void main(String[] args)
new testCursor().setVisible(true);
}

Answer 1

Hi,
I see this problem with older vers. (eg. JDK 1.2).
With JDK 1.3 seems work ok (some times, when the
work event is small, the cursor is not actualized).
And you can try call sync() from Toolkit object :
getDefaultToolkit().sync();
the java doc say :
     * Synchronizes this toolkit's graphics state. Some window systems
     * may do buffering of graphics events.
     * <p>
     * This method ensures that the display is up-to-date. It is useful
     * for animation.
Hope this help.