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 parts 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 consultant to each point of JavaBeans however it does foc us on the whole lot you must comprehend to get on and use JavaBeans - together with linking JavaBeans to ActiveX parts. you will study: easy methods to use the BeanBox, how the Delegation occasion version works, the right way to create an easy Bean, what different types of houses are at present supported by way of JavaBeans, how to find a BeanInfo item, and many extra. plenty of examples are integrated and also you are inspired to attempt them out as you cross so you get a true 'feel' for a way JavaBeans paintings.

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This can be a point of confusion for JavaBean developers, who might well attempt to find the Bean class upon which to construct their bean. Instead, any class in Java can be converted into a Bean as long as it follows the Bean naming conventions or defines a Beanlnfo object. The only thing to add to this is that if a Bean has a visual appearance which can be used within a tool builder then the Bean must inherit from the AWT class Componen t or one of its subclasses. The great advantage of this approach is its simplicity; the disadvantage is that, at first sight, it appears that there is nothing concrete that defines a bean.

The class Counter actually extends the class Panel in order that the Bean can have a visual representation in a "Bean Box" style tool. Panel has been used so that not only can we set the background and foreground colours (features inherited from Component via Panel), we can also add other components to the display (in this case a simple text label object). This text label will be used to display the current value of the count variable (via the setText () method). We have also defined a getMinimumSize () method which will be used by a development tool to determine the minimum size to allocate to the visual representation of the Bean.

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).

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