Why listener methods are getting called twice ?

Hi Group,
I have a doubt, i need to know logic behind it.
Lets consider, JComboBox,
For an item state change of JComboBox,
itemStateChanged method gets called twice.
Its similar with valueChanged getting called twice
on List Selection Event.
Why does it call twice ? Is there any way, I can
have invocation only once (except flagging mechanism)?
with regards,
vikram.

http://java.sun.com/j2se/1.3/docs/api/java/awt/event/ItemListener.html
tells the following:
public void itemStateChanged(ItemEvent e)
Invoked when an item has been selected or deselected. The code written for this method performs the operations that need to occur when an item is selected (or deselected).
So the listener is notified for both items: losing and gaining selection.
If you are only interested in listening to either selection or deselection event you can check which was the cause for the method call by examing the ItemEvent parameter i.e. item_event.getStateChange() == ItemEvent.DESELECTED or ItemEvent.SELECTED and then decide whether you are interested in the event at all.
I don't know how to stop JComboBox from launching both select and deselected events.

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here is the code !!!!!!!!!!
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public void itemStateChanged(ItemEvent e) {
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Maybe this thread will answer why it gets called twice:
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