Answer Posted / venkat

1)The "ServletConfig" , Config stands for configuration.it
is about deployment values you have configred for the
servlet.mostly those values which your servlet might want
to access that you dont want to hard-code,like may be a d/b
name.
{one of the reasons you dont want to hard-code"you have to
recompile the entire servlet if you wish to change a single
value},
It is Unique for each servlet(in a layman's language,one
can treat it as local variables to a particular method).
if you wish to change the values,you can do it by modifying
DeploymentDescriptor(in other words:web.xml)

2)ServletContext(they might have named it AppContext
instead of ServletContext):- you have only one
ServletContext for an entire application{NOTE:-.only if the
application is not distributed, in other scenario,you have
one for each JVM}
you can think it as a bulletin-board, where you can
put up messages (called attributes) that other parts of the
application can access.{in a layman's language one can
treat it as a static values}

you can use it to get server info, including the name and
version of the
Container, and the version of the API that’s supported.

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