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session vs class variables

 
Anonymous
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Whatis the difference between session variables and using class variables? For exampe, if I have a class variable in my servlet that gets modified in the code, its new value gets carried to the next time the servlet is invoked. So why would I want to ever use a session variable if it seems the class variable holds data through various requests?
Thanks
Brian
 
Anonymous
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Session variables are browser client - server specific, i.e for each and every session of the browser with the server u have a set of session variables at ur disposal.so one set of session variables for client session may have entirely different values from that of the other session values.
If we have the class variable in the server,then the value of the variable will be same for all the browser sessions.
Mainly session variable are used for security purpose,once the client server connection is lost session variables of that instance is also lost...
hope this answers the question,
 
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