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Java Forum / General / June 2005To listen or to override
If a method in a superclass changes the value of a property and a subclass needs to do something upon the change, do I have to override the superclass' method, do something, and then call the superclass' method, or should I register a PropertyChangeListener? > If a method in a superclass changes the value of a property and a > subclass needs to do something upon the change, do I have to override > the superclass' method, do something, and then call the superclass' > method, or should I register a PropertyChangeListener? Hi, Either method works, technically. I would think that if you're trying to listen for a property change, a PropertyChangeListener is the way to go (it just seems to me that's the whole purpose of the system, so why not use it?) Subclassing just to get notification when one property is changed could get messy I would think, especially if two people both decide to do it, then one has to subclass the other's code if both want to be notified, and so on. Chris > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 [quoted text clipped - 14 lines] > then one has to subclass the other's code if both want to be notified, > and so on. But if I read the OP correctly, he already has a subclass. So essentially the subclass wants to know when the object's own attributes are changed. Using a listener system seems kind of overkill for that. Ray  SignatureXML is the programmer's duct tape. [snip] > But if I read the OP correctly, he already has a subclass. So > essentially the subclass wants to know when the object's own attributes > are changed. Using a listener system seems kind of overkill for that. > > Ray Hi, I didn't actually notice that the first time (the subclass is already there); however... I guess it depends. Look at a JFrame after all: you subclass it, but you still stick listeners in it for WindowEvents. On the other hand, if it's something more simple like properties changing, then I agree catching the modifications in an overridden method might be less work. Chris Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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