How to automatically show items in a JList

I'm new to java and swing and I'm working with JList. I want to make the content of the list show automatically whenever a new item is added to the list model.
The user clicks a button and a method perform some work periodically adding status message to the List model attached to the JList. All the messages appear when the method completes but I would like them to appear as it it running.
I tried but this doesn't work:
mList_Status.setListData(dlm.toArray());
mList_Status.repaint();
Is this a threading issue? Thanks!

Is this a threading issue?Yes, you are doing all your work in the EDT, which is preventing the GUI from repainting itself. You need to use a separate Thread. Read the Swing tutorial on Concurrency for more information.

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