Developing Java Beans - download pdf or read online

By Robert Englander

O'Reilly books are hardly ever for neophytes, yet complex clients swear by means of them, and those should be no exception. Englander covers a scorching 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 records, the BeanBox device, estate editors, ActiveX, and the java.beans package deal. Flanagan's paintings is the booklet Java programmers wish within sight after they are on the keyboard. a whole ready-reference paintings, this belongs in all collections assisting programmers. Java is a always altering language so Nutshell could be popping out frequently with new versions; constantly have the most recent one to be had. Reese is going past uncomplicated applet layout to relational databases, SQL, object-oriented database purposes, program servers, and distant item manipulation. The examples used through the ebook are in line with a banking software designed in Java.

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Each of these classes depends upon each other. This creates a problem when you are compiling your code. The Thermometer class expects the adapter class to be compiled previously, since it needs to reference it, and the adapter expects the same thing about the Thermometer. So which one do we compile first? This circular dependency is a sign that we need to provide a closer physical relationship between the Thermometer and adapter classes. Since the adapters are specific to the Thermometer class, they don't have to be public, so we can move the code for the adapters into the same file as the Thermometer class.

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. event package provides adapters for various event-listener types.

ArrayIndexOutOfBoundsException if an index is used that is outside the bounds of the property array. Although this is an important aspect of indexed properties, it isn't required for the indexed properties pattern. Since the indexed properties are considered ordered collections, I think the indexed get() and set() methods should always declare the ArrayIndexOutOfBoundsException. It might have been better to make it a requirement for this pattern. Imagine that we are building a system that tracks stock prices in real time.

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