The
Java Core Reflection API Java
Object Serialization JDK1.1
- AWT Enhancements
Manifest
File Specification
Java
IDL
Remote
Method InvocationBelow is a brief discussion on the these topics.
PROPERTIES
Bean properties are attributes of the bean's internal state. These
associated pieces can be queried
or can be set via appropriate methods exported by the bean. In
addition to basic properties,
the property itself may be indexed, bound or constrained.
An indexed property has an array value whereas methods allow each
element or the entire array to be set..
A bound property provides notification service when a property changes.
In general, a PropertyChangeListener
event listener interface reports the event. A constrained
property not only notifies registered listeners, but it
also allows for input. Another bean may veto the change deeming
it invalid; thus the property change cannot
commence until all interested beans concur.
Interfaces for property changes:
public interface java.beans.PropertyChangeListener extends java.util.EventListener
public PropertyChangeEvent (Object source, String propertyName,
Object oldValue, Object newValue);
public Object getNewValue();
public Object getOldValue();
public Object getPropagationId();
public String getPropertyName();
public void setPropagationId(Object propagationId);
Public PropertyVetoException(String mess, Property ChangeEvent evt);
EVENTS
Events are a core feature of the JavaBeans. This is well suited for
event driven programming. JavaBean event
modeling is based on the AWT components. When an event is dispatched
to the appropriate listener,
it passes through the processEvent() method. In general, this method
checks the class of the event and
sends it to the class specific method. For example, if a mouse event
occured, the event is passed to either
processMouseEvent() or
processMouseMotionEvent().
METHODS
JavaBean methods do not entail any special meaning. They are simply any external methods supported by a bean.
REFERENCES:
1. Teach Yourself Java 1.2 in 21 Days
Laura Lemay and Rogers Cadenhead
Third Edition, Sam's Publishing
2. Java in a Nutshell
David Flanagan
Second Edition, O'Reilly and Associates