JavaBeans Section Index | Page 6
Can I assume that the order event targets are registered with a JavaBean will be the order they will be notified?
Order of delivery to targets is implementation dependent! Never assume that order of addXXXListener() calls determine order of delivery!
While every tool varies, in general, they can: Determine what methods, properties, and events it supports Change its properties Connect events between components Save / restore its state to / fro...more
The static isDesignTime() method of the Beans class allows your bean to act differently at design time vs. at runtime, potentially freeing up CPU cycles for the designer. For instance, if the purp...more
New events must subclass the java.util.EventObject class. If they do not, a development environment will not be able to find out the necessary information from the component using the event. See H...more
JavaBean listeners must extend the empty java.util.EventListener interface. If they do not, a development environment will not be able to find out the necessary information from the component need...more
Beans can be packaged in JAR, ZIP, other archives. Using the jar tool that comes with the JSDK, you would need to perform the following two steps: Create descriptive text file called a manifest s...more
Instead of continually creating JavaBeans components and setting their state to some common setting, you can save what tends to be called a pickled version of the component, with the bean properti...more
The JavaBeans model provides a default way of looking inside a class to find out its properties and events it generates. If you would like to provide a different view to the development tool, then...more
The only absolute requirement is that the component implement the java.io.Serializable interface. Usually, you'll find the following, but they are not requirements from the strictest sense, only f...more
JavaBeans are reusable software components written in the Java programming language, designed to be manipulated visually by a software develpoment environment, like JBuilder or VisualAge for Java....more
Components must implement add and remove listener methods (addXXXListener() and removeXXXListener())to maintain a list of targets and implement code to notify the targets when the event happens. C...more
The BDK is the Beans Development Kit. It is a freely available testing tool to try out your JavaBeans components within a BeanBox. While a good environment for learning about JavaBeans, it is not ...more
Enterprise JavaBeans and JavaBeans are not the same thing; nor is one an extension of the other. They are both component models, based on Java, and created by Sun Microsystems, but their purpose ...more
The JavaBean specification requires that all beans implement persistence through the Serializable or Externalizable interfaces. Nothing more is required. IBM interpreted the bean specification a b...more