problem with the progress bar.... please help me..

[cc14]

I have a progress bar and a button on a form. When i push the button I execute several things but I want in the same time to increse the value of the progress bar. Why the changement is visible only at the end? Can somebody help me? Thanks a lot.

void button2_actionPerformed(ActionEvent e) {

jLabel1.setText("Sending..."

jProgressBar1.setStringPainted(true);
jProgressBar1.setMinimum(0);
jProgressBar1.setMaximum(fileManager.ContainFolder("Outbox&quot.length);

jProgressBar1.setValue(0);
jProgressBar1.revalidate();
jProgressBar1.setStringPainted(true);

smtp.OpenConnection(extractor.GetSmtp(),extractor.GetUser(),extractor.GetPassword(), 25,jTextArea1 );

for (int i=0;i<fileManager.ContainFolder(&quot;Outbox&quot.length;i++)
{
if (smtp.SendMessages(extractor.GetEmail(),
extractor.GetToEmail(&quot;Outbox/&quot;+fileManager.ContainFolder(&quot;Outbox&quot),
extractor.GetSubject(&quot;Outbox/&quot;+fileManager.ContainFolder(&quot;Outbox&quot),
extractor.GetName(),
extractor.GetToName(&quot;Outbox/&quot;+fileManager.ContainFolder(&quot;Outbox&quot),
extractor.GetBody(&quot;Outbox/&quot;+fileManager.ContainFolder(&quot;Outbox&quot),jTextArea1)==1)
//move from outbox to sent
fileManager.RenameMoveFile(&quot;Outbox/&quot;+fileManager.ContainFolder(&quot;Outbox&quot,&quot;Sent/&quot;+fileManager.ContainFolder(&quot;Outbox&quot);
jProgressBar1.setStringPainted(true);

jProgressBar1.setValue(i+1);

// ???????
// WHY DOESNýT MODIFY THE VALUE EXCEPT TO THE END WHEN BECOMES 100%

jProgressBar1.revalidate();
jProgressBar1.repaint();
jProgressBar1.setStringPainted(true);
}