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CHAPTER 28 Java Beans CHAPTER 29 Introducing Swing CHAPTER 30 Exploring Swing CHAPTER 31 Servlets
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his chapter provides an overview of Java Beans Beans are important because they allow you to build complex systems from software components These components may be provided by you or supplied by one or more different vendors Java Beans defines an architecture that specifies how these building blocks can operate together To better understand the value of Beans, consider the following Hardware designers have a wide variety of components that can be integrated together to construct a system Resistors, capacitors, and inductors are examples of simple building blocks Integrated circuits provide more advanced functionality All of these different parts can be reused It is not necessary or possible to rebuild these capabilities each time a new system is needed Also, the same pieces can be used in different types of circuits This is possible because the behavior of these components is understood and documented The software industry has also been seeking the benefits of reusability and interoperability of a component-based approach To realize these benefits, a component architecture is needed that allows programs to be assembled from software building blocks, perhaps provided by different vendors It must also be possible for a designer to select a component, understand its capabilities, and incorporate it into an application When a new version of a component becomes available, it should be easy to incorporate this functionality into existing code Fortunately, Java Beans provides just such an architecture
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A Java Bean is a software component that has been designed to be reusable in a variety of different environments There is no restriction on the capability of a Bean It may perform a simple function, such as obtaining an inventory value, or a complex function, such as forecasting the performance of a stock portfolio A Bean may be visible to an end user One example of this is a button on a graphical user interface A Bean may also be invisible to a user Software to decode a stream of multimedia information in real time is an example of this type of building block Finally, a Bean may be designed to work autonomously on a user s workstation or to work in cooperation with a set of other distributed components Software to generate a pie chart from a set of data points is an example of a Bean that can execute locally However, a Bean that provides real-time price information from a stock or commodities exchange would need to work in cooperation with other distributed software to obtain its data
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Advantages of Java Beans
The following list enumerates some of the benefits that Java Bean technology provides for a component developer:
A Bean obtains all the benefits of Java s write-once, run-anywhere paradigm The properties, events, and methods of a Bean that are exposed to another application can be controlled Auxiliary software can be provided to help configure a Bean This software is only needed when the design-time parameters for that component are being set It does not need to be included in the run-time environment The configuration settings of a Bean can be saved in persistent storage and restored at a later time A Bean may register to receive events from other objects and can generate events that are sent to other objects
Introspection
At the core of Java Beans is introspection This is the process of analyzing a Bean to determine its capabilities This is an essential feature of the Java Beans API because it allows another application, such as a design tool, to obtain information about a component Without introspection, the Java Beans technology could not operate There are two ways in which the developer of a Bean can indicate which of its properties, events, and methods should be exposed With the first method, simple naming conventions are used These allow the introspection mechanisms to infer information about a Bean In the second way, an additional class that extends the BeanInfo interface is provided that explicitly supplies this information Both approaches are examined here
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