Developing Java Beans - download pdf or read online

By Robert Englander

ISBN-10: 0585002614

ISBN-13: 9780585002613

ISBN-10: 1565922891

ISBN-13: 9781565922891

O'Reilly books are hardly ever for neophytes, yet complex clients swear through them, and those could be no exception. Englander covers a sizzling Java subtopic for college students, programmers, and execs already familar with Java and object-oriented programming. He discusses occasions, occasion adapters, houses, endurance, java archive documents, the BeanBox device, estate editors, ActiveX, and the java.beans package deal. Flanagan's paintings is the publication Java programmers wish within reach after they are on the keyboard. a whole ready-reference paintings, this belongs in all collections assisting programmers. Java is a consistently altering language so Nutshell should be popping out frequently with new variants; constantly have the latest one available. Reese is going past easy applet layout to relational databases, SQL, object-oriented database purposes, software servers, and distant item manipulation. The examples used in the course of the publication are in accordance with a banking software designed in Java.

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Serializable interface, which we discuss in Chapter 5. Serializable { // construct the object public PropertyChangeSupport(Object source); // add a property change listener public synchronized void addPropertyChangeListener(PropertyChangeListener l); // fire a property change event to any listeners public void firePropertyChange(String propertyName, Object oldValue, Object newValue); } // remove a property change listener public synchronized void removePropertyChangeListener(PropertyChangeListener l); We could reimplement the Temperature class by inheriting from the PropertyChangeSupport class.

The new adapter might be called a GenericTemperatureThresholdAdapter. 0; Now we need a way to assign the threshold values. For our example, we create methods for getting and setting these values. You'll see in Chapter 4, that these values represent properties of the adapter. The new methods of the GenericTemperatureThresholdAdapter look like this: public void setLowThreshold (double low) page 43 Developing Java Beans { } lowThreshold = low; public double getLowThreshold() { return lowThreshold; } public void setHighThreshold(double high) { highThreshold = high; } public double getHighThreshold() { return highThreshold; } Now we need to modify the code that does event notifications to perform the filtering.

Println(e); } } Now that we've got an adapter, let's rewrite the Thermometer class to use it. This is pretty straightforward stuff. We can get rid of the inner class adapters, and use one instance of GenericTemperatureAdapter instead. In the earlier example, the methods temperature1Changed() and temperature2Changed() took an instance of double as the parameter. This was because the inner class adapters pulled the new temperature from the event object before the methods were called. The new adapter, GenericTemperatureAdapter, just passes the event object to the target method, so we need to change the parameter type for these methods from double to TempChangedEvent.

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Developing Java Beans by Robert Englander

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