title: Java Swing GUI hour glass
body: <p>There is a <code>JTabbedPane</code> In my <em>Swing</em> program.
  When user clicks on a tab, the program takes a while to get the data and process the results, then shows the results in the selected tab.</p>
  
  <p><strong>How can I display a hour glass, or something of that effect</strong> so that user knows it's processing data? Not to click on the tab again before it finishes it job.</p>