- All Superinterfaces:
 EventListener
Instances of classes that implement the 
LineListener interface can
 register to receive events when a line's status changes.- 
Method Summary
 
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Method Details
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update
Informs the listener that a line's state has changed. The listener can then invokeLineEventmethods to obtain information about the event.- Parameters:
 event- a line event that describes the change
 
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