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Simplify Event/Listener coding

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by Mark W. Kaelin

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The Jan. 13, Java TechMail discusses the Notifier Class. Will you be able to simplify your Event/Listener coding using the Notifier Class?

2 replies

by solrak29

I didnt' find this tip complete as I tried to test the code, but it seems that the ActionEvent object does not have a simple constructor as noted in the document. Thus, made this article incomplete and code unusable.....

Can you help?

by bayard-generationjava

That's true. You caught me being vague and hypothetical in my "Wouldn't it be nice".

java.awt.event.ActionEvent doesn't have a constructor which takes (Object), although the ultimate ancestor class java.util.EventObject does. Instead it has ActionEvent(Object, int, String), so replace

notifier.notify( new ActionEvent(this) );

with

notifier.notify( new ActionEvent(this, 0, "foo") );

The Event itself is relatively unimportant for the concept of Notifier as it just gets passed around, but the lack of compiling is a pain I admit. EventObject is the important class, ActionEvent is just an implementation.

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