Change jLabel visibility immediately when jButton action performed

Question

I am using NetBeans IDE and I have some problem when I am trying to change jLabel visibility to true:

private void buttonActionPerformed(java.awt.event.ActionEvent evt)
{
   LoaderLabel.setVisible(true);
   try { sleep(1000000); } catch { ... }
}

The visibility is changed only after the long sleep...

The problem is that I want to make some very intensive calculations in this method, but at the same time present some gif. Why the jLabel visibility is changed only at the end of the function and how do I fix it?

Thanks! :)

Yasas · Accepted Answer · 2015-04-21T15:26:56.687

1

This is because you should set the component's properties in EDT thread (Event Dispatch Thread). Try:

EventQueue.invokeLater(new Runnable() {
  @Override
  public void run() {
    LoaderLabel.setVisible(true);
  }
});

or using Lambda in Java 8

EventQueue.invokeLater(() -> LoaderLabel.setVisible(true));

edited Apr 21 '15 at 15:26

answered Apr 21 '15 at 13:08

Yasas

82
2

Thanks - but I didn't understand. I replaced my LoaderLabel.setVisible(true) with your code but nothing changed. – Apr 21 '15 at 13:32
found it helpful - http://stackoverflow.com/questions/13238618/set-text-in-label-during-an-action-event – Apr 21 '15 at 13:40

Change jLabel visibility immediately when jButton action performed

1 Answers1