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Double-Click Handling
JList doesn't provide any special support for handling double or triple (or n) mouse clicks; however, it's easy to handle them using a MouseListener. Use the JList method locationToIndex() to determine what cell was clicked. For example:

codice:
final JList list = new JList(dataModel);
MouseListener mouseListener = new MouseAdapter() {
    public void mouseClicked(MouseEvent e) {
        if (e.getClickCount() == 2) {
            int index = list.locationToIndex(e.getPoint());
            System.out.println("Double clicked on Item " + index);
         }
    }
};
list.addMouseListener(mouseListener);
Note that in this example the JList variable is final because it's referred to by the anonymous MouseListener class.
il link è >
http://java.sun.com/products/jfc/tsc...t_1/jlist.html

grazie lo stesso ... !!!

e mi funziona :metallica