JavaBeans for Not Yet Techies

"Computer Careers: Developing Java Applications With Re-Useable, Pre-Written Code You Can Plug In Where You Need It"

by Richard Stooker, President Info Ring Press and author of Secrets of Changing to a Computer Career

JavaBeans pre-written Java code components that are re-useable. You can plug them into new programs as you develop them. Because they're Java, they're architecture and platform - independent. Technically, JavaBeans are Java classes with get/set methods on them.

JavaBeans are reusable components with properties, events and methods that can be strung together to create Java applications - object oriented programming interfaces that act as building blocks.

They can be as simple as a button that the program user can click on or small programs within themselves. JavaBeans can interact with other beans or other objects in accordance with the standards produced by Sun Microsystems. You can use existing beans and establish relationships between them.

The goals of JavaBeans are:

1. Compact -- because they are used by distributed applications with low-bandwidth connections.

2. Portable -- they can be used and re-used anywhere appropriate.

JavaBeans have persistence -- this is automatic by using the reserialization mechanism in Java. This is a programming method for storing the state of a component in a safe place. In effect, it remembers how you had set a program just before leaving it. For instance, it could know you were using a purple typeface.

They can use RMI / Remote Method Invocation which is how Java communicates across networks.

JavaBeans are developed using the Beans Development Kit (BDK) available from Sun Microsystems

It contains a rich set of mechanisms and a framework for interaction among objects. Bean development takes place inside a container, which can be any operating system.

JavaBeans have user-interface components that can hold other components. They can be packaged and stored in Java archive or JAR files.

Next: Java NIO

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