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

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 functions. you could both learn the publication from begin to end (it shouldn take too lengthy) otherwise you can dip into it for numerous elements of JavaBeans as and for those who have to. It does not try and be an entire in-depth advisor to each point of JavaBeans however it does foc us on every part you must be aware of to get on and use JavaBeans - together with linking JavaBeans to ActiveX elements. you will research: tips to use the BeanBox, how the Delegation occasion version works, the best way to create an easy Bean, what different types of homes are presently supported via JavaBeans, how to find a BeanInfo item, and many extra. plenty of examples are incorporated and also you are inspired to aim them out as you cross so you get a true 'feel' for a way JavaBeans paintings.

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Changes in this value are independent of changes in any other property. Bound A bound property is one in which a change to the property results in a notification of that change being sent to some other Bean Constrained A constrained property is one in which an attempt to change the property's value is validated by another Bean. The second Bean may reject the change if it is not acceptable. Indexed An indexed Bean property is one that supports a range of values instead of a single value (that is, the property is actually an array of values).

As you can see from this diagram, the separation of interface and control is conceptually very clean. 5. If you press the "Exit" button an event will be generated and the actionPerformed () method of the Exi tButtonHandler object will be run. 5: The ExitWin window Of course, one handler can register itself with a number of different objects and handle events from each of them. If they all generate the same type of event (for example if we defined a general button event handler for three buttons) then we would need to identify which event we are dealing with.

It is therefore very important to understand how the Delegation Event Model works. This chapter provides an introduction to this event-handling model - if you are already familiar with it you may wish to move on to the next chapter. Objectives Once you have finished this chapter you will be able to: • • • • Create an event and implement a listener to handle the event. Create new events from existing event classes. Define new listener interfaces for new categories of events. Understand the difference between multicast and unicast sources.

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