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public interface EventObserver
Specifies an Event observer.
Method Summary | |
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void |
addListener(ActionListener listener)
Adds listener to this EventObserver, adding the same listener
a second time has no effect. |
void |
removeListener(ActionListener listener)
Removes listener from this EventObserver |
Method Detail |
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void addListener(ActionListener listener)
listener
to this EventObserver, adding the same listener
a second time has no effect.
listener
- the listener to add
IllegalArgumentException
- in case listener is nullvoid removeListener(ActionListener listener)
listener
from this EventObserver
listener
- the listener to remove
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