Answer Posted / sabeetha

Down Casting is nothing but casting down the inheritance
tree to a more specific class i.e casting a superclass to
subclass.
Upcasting- casting up the inheritance tree to a more general
type. It is done implicitly (i.e typing in the cast is not
required). Its because the classes at lower level of
hierarchy have all those features that are present in the
classes above them in the inheritance hierarchy. So they can
be upcasted implicitly ( like Dog IS-A Animal).

I got this answer
from(http://javaforyou.wordpress.com/2008/06/22/casting-reference-variables-downcasting-upcasting/)
with example.

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