Force ListCellRenderer to update GUI

[Fintan Conway]

Hi All,
I have a JList which shows a list of files. I can programmatically grab the selected files and loop through each file - performing operations on it.
What I want to do is change the background of a file once it has been processed to show the status of the file (Green = OK, Red = Fail).
I am storing the index of the files in 2 ArrayLists - one for the good files and one for the bad files.
I have created the ListCellRenderer which will set the appropriate background depending on whether a file is in one of the ArrayLists or not.
The problem is that the custom ListCellRenderer only updates the JList AFTER all files have been processed. I want the JList to be updated after each individual file has been processed. Is this possible?
I have added Thread.yield() and Thread.sleep(5000) and JList.repaint() in the loop that processes each file - but these do not work.
Can anyone help me?
Many thanks,
Fintan
PS Here is the code that loop thro' each file :

 
        for (int i = 0; i < filesWithText.length; i++) {
            good = newText(find, replace, filesWithText[i]);
            if (good) {
            goodFiles.add(new Integer(i));
            } else {
badFiles.add(new Integer(i));
            }
//lstMultiFile.setSelectedIndex(i);
lstMultiFile.repaint();
Thread.yield();
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
        }

Here is the getListCellRendererComponent method of my ListCellRenderer :

public Component getListCellRendererComponent(
JList list, 
Object value, int index, boolean iss, boolean chf) {
super.getListCellRendererComponent(list, value, index, iss, chf);
/* We additionally set the background colour property here.
 */
 Integer thisInt = new Integer(index);
 
 if (goodFiles.contains(thisInt)) {
 setBackground(Color.green);
 } else {
if (badFiles.contains(thisInt)) {
setBackground(Color.red);
}
 }
 
return this;
}

[phil marquet]

for(int i = 0; i < userListModel.size(); i++) {
userListModel.setElementAt(userListModel.getElementAt(i), i);
}

pm