difference b/w Serilzation and Externalization

Hi,what is the difference b/w Serilzation and Externalization?when one we have to use difference b/w Serilzation and when we have to use Externalization
[166 byte] By [shirish002a] at [2007-10-3 1:12:42]
# 1
This question has already been answered.
aniseeda at 2007-7-14 18:09:45 > top of Java-index,Core,Core APIs...