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JAVA BEANS By Madhuri Kakumanu What is a Java Bean? “ A Java Bean is a reusable software component that can be visually manipulated in builder tools.” JavaBeans JavaBeans is a component model for Java. It defines Java components and how they fit together. Allows users to construct applications by joining components together either programmatically or visually Visual programming is a key part of the component model. JavaBeans Architecture Architecture supports the features of software reuse, component models and object orientation. Compact and Easy Portable Flexible Build-Time Component Editor Persistence Support of Visual Programming SAMPLE public class MyBean implements java.io.Serializable{ protected int theValue; public MyBean() { } public void setMyValue(int newValue) { theValue = newValue; } public int getMyValue() { return theValue; }} Key Technologies Events Introspection Customization Persistence Distributed Systems Events Events are messages sent from one object to another notifying the recipient that something has happened Event Adapters Introspection: Is a process of exposing the properties, methods and events that a JavaBean component supports. Enables a builder tool to analyze how a bean works. This process is used at run-time as well as by a visual development tool at design time Customization: Enables the developer of a Bean component to customize the appearance and behavior of a bean A custom property editor should to be created to associate with the custom classes Properties: Supports the customization mentioned above. Persistence Enables developers to customize Beans and then retrieve those Beans later, with customized features intact Create a JavaBean Create a Bean(jar) file jar cfm FancyButton.jar\ FancyButton.mf FancyButton.class FancyButton.gif FancyButton.au Copy the Bean file to C:\BDK1.0\jars Test the Bean in the BeanBox. The jar command syntax is: Jar[ctxvfm][jar-fil
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