Hi
These are the first questions related to the (excellent) article from DeveloperWorks
by Bruce Snyder: "Learn the basics of object-relational binding using Castor", august
2002:
http://www-106.ibm.com/developerworks/java/library/j-castor/
This article helped me a lot getting started withCastor-JDO, but it still leaves som
open questions. Here they come...
Q#1:
In Listing 1. Product.java you find these statements:
public void addCategory( Category category )
{
if ( _categories.contains( category ) ) {
_categories.addElement( category ); category.addProduct( this );
}
}
(Remark: there's a missing NOT-operator in the "if"--ought to be corrected).
Question is: why this check for existence of "category" in "_categories"?
It's obviously to avoid adding an object twice, but is it because Castor would do this
in some situations?
Or because a programmer could (by accident) use both addCategory and addProduct (in
the Category class)?
Q#2:
What's the reason for using underscores as the first character in member variables?
Thanx for any help.
/Keld
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