Quoted from
JavaWorld.com (reference below)...
"Instances of the PersistenceCapable classes that have JDO identity represent
first-class objects; these objects are stored in a data store with their associated second-class objects (if any) and primitive values...
"Also PersistenceCapable instances,
second-class objects differ from first-class objects in that they have no JDO identity of their own..."
("A JDO instance is a
Java class instance that implements the application functions and represents data in an enterprise data store.")
Ref:
http://www.javaworld.com/javaworld/jw-04-2002/jw-0412-jdo.html NOTE: This appears to be beyond the scope of the
SCJP 1.4 exam.
[ October 19, 2004: Message edited by: marc weber ]