JList item selected is displayed twice. Please Assist

Question

Folks,
I have this strange behaviour when I select an item from the JList.
When I select the an item, it gets displayed twice.
Can anyone tell me why this is being displayed twice?
I am also checking the Java Sun Swing tutorials site..but no luck as yet.
Attached is a short class.
If you click on Black or Blue etc ,it gets displayed twice...
public class JListDemo extends JFrame{
private JList colorList;
private Container c;
private String colorNames[] = {"Black", "Blue","Red","Green","Yellow"};
public JListDemo() {
super("JList Demo");
c = getContentPane();
c.setLayout(new FlowLayout());
/** Create a List */
colorList = new JList(colorNames);
colorList.setVisibleRowCount(3);
colorList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
c.add(new JScrollPane(colorList));
//** Set up Event Handler.
colorList.addListSelectionListener(
new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e)
System.out.println(colorList.getSelectedValue());
setSize(1000,550);
show();
public static void main(String[] args) {
JListDemo JListDemo1 = new JListDemo();
}

Answer 1

in your ListSelectionListener you must check if the event is one of multiple change events. In your case you get one event when the mouse first selects an item and possible more when you move the cursor over the other entries. If you are only interested in the final selection check if e.getValueIsAdjusting() is false.
// not interested in events if they are not final
if (e.getValueIsAdjusting())
    return;
// do what ever you want
System.out.println(colorList.getSelectedValue());
...Hope this helps!