By Robert Englander

O'Reilly books are not often for neophytes, yet complicated clients swear by way of them, and those might be no exception. Englander covers a sizzling Java subtopic for college students, programmers, and pros already familar with Java and object-oriented programming. He discusses occasions, occasion adapters, houses, patience, java archive documents, the BeanBox device, estate editors, ActiveX, and the java.beans package deal. Flanagan's paintings is the ebook Java programmers wish within sight once they are on the keyboard. an entire ready-reference paintings, this belongs in all collections aiding programmers. Java is a consistently altering language so Nutshell can be popping out usually with new variants; continuously have the latest one available. Reese is going past uncomplicated applet layout to relational databases, SQL, object-oriented database functions, software servers, and distant item manipulation. The examples used through the e-book are according to a banking program designed in Java.

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The PropertyChangeEvent also contains something called a propagation ID. This is reserved for future use. If you receive a PropertyChangeEvent and then in turn generate and fire another PropertyChangeEvent, you must propagate the propagation ID as well. A PropertyChangeEvent for a bound property should only be fired after its internal state has been updated. This means that the event signifies a change that has already taken place. EventListener. PropertyChangeEvent. PropertyChangeListener interface and register itself with the source object by calling its addPropertyChangeListener() method.

This may not be the best approach if only a few of the events that are supported by the event listener interfaces are of interest. Another problem occurs when an object is listening for events from two or more objects that are sources of the same event types. Since an object can only implement an event listener interface once, it would have to figure out for itself which object was the source of the event. Neither of these problems is insurmountable, but each can (and often will) lead to code that is hard to read and even harder to maintain.

We need some way of telling the adapter how to forward an event to the target. In the earlier examples, the TemperatureAdapter class had knowledge about the methods available in the Thermometer class. But this is no good, because we want to decouple the adapter from the target. Normally we would define an interface for the target object to implement, but if we did, we would have the same problem we had before the adapter was introduced. The proposed interface can be implemented only once, so again we would have no way of knowing which adapter was forwarding the event to us.

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