Essential JavaBeans fast by John Hunt BSc, PhD, MBCS, CEng (auth.)

By John Hunt BSc, PhD, MBCS, CEng (auth.)

Essential JavaBeans fast de-mystifies the terminology, and will get you utilizing the JavaBean elements speedy and successfully on your personal purposes. you could both learn the e-book from begin to end (it shouldn take too lengthy) otherwise you can dip into it for varied points of JavaBeans as and should you have to. It does not try to be an entire in-depth consultant to each point of JavaBeans however it does foc us on every part you want to be aware of to get on and use JavaBeans - together with linking JavaBeans to ActiveX elements. you are going to research: how you can use the BeanBox, how the Delegation occasion version works, how one can create an easy Bean, what kinds of houses are at present supported by way of JavaBeans, how to find a BeanInfo item, and plenty extra. plenty of examples are integrated and also you are inspired to attempt them out as you move so you get a true 'feel' for a way JavaBeans paintings.

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Remember that the BeanBox tool expects beans to be placed in a JAR file within a directory called jars (beans can be loaded from other directories using the Load Jar option from the BeanBox File menu). A JAR file is a ZIP format archive file with an optional MANIFEST file (JAR stands for Java Archive file). 5). The statement Java-Bean: is used to indicate whether the preceding class is a bean or not. 5: The mani f es t . class Java-Bean: True Name: counter/Alarm. class Java-Bean: True Constructing the JAR file, and placing the JAR file in an appropriate directory, can be done manually or using a make file.

We are going to use the example presented in many JavaBeans tutorials, as it is easily understood and available in the BeanBox. This example will make use of the Duke animation bean (labelled Juggler in the ToolBox palette). You should therefore add the Juggler bean to the BeanBox. 11. You now have a BeanBox containing three beans. However, these beans do not actually do anything yet. You need to connect them together, as outlined above. The first thing we will do is to link the Start button to the Juggler bean.

The listener object then handles the events that are generated for that object. For example, if we wish to create a button which will be displayed on an interface and allow the user to exit without using the border frame buttons, then we need to create a button and a handler for the action on the button. addActionListener(exitButtonHandler); The Delegation Event Model 35 This code creates a new user-defined listener object, ExitButtonHandler, and then creates a new Button (with a label "Exif').

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