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> Politically, there were some that thought account number should be
a "number".  However, in our case the account 00001 is not equal to the
account 001, which meant that account numbers where not mathematical
numbers
and thus did not match any Java type.  The OO solution was to create new
type "account id" which internally held the value as a String.
----------

This is an excellent point about objects and the real world.  There are
times when things can run somewhat counter to our intuition at first
glance, but then start to cause problems.  A second, more careful look,
often reveals that some simple assumption on our part ("account numbers are
NUMBERS, right?") is incorrect, leading to an invalid object design.  Your
solution of an account id type was, IMHO, the perfect solution.

Joe Pluta
www.java400.net

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