Answer Posted / almeja del río

from:
http://forums.sun.com/thread.jspa?threadID=526214


Java Beans follow the Bean conventions:

(1) Default, no-arg ctor,
(2) Serializable,
(3) getX()/setX() or isX()/setX() naming convention for
read/write access to private data member X,
(4) Can use java.bean.PropertyChangeEvent to notify
interested parties when values change.
(5) Can use java.bean.PropertyChangeListener to register for
notification when a particular property changes.

"Normal" Java classes aren't required to follow any of these
conventions.

There's a great
[url=http://java.sun.com/docs/books/tutorial/javabeans/]tutorial[/url]
on Java Beans from Sun.

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