Hash table

[chandra maddila]

Can I store 1 million records in a hash table for a web based application? How the performence will be effected?

[George Brown]

why not try it with a noddy program to see?
You could put String representations of integer numbers into a hashtable indexed by the same integer number as an Integer object. Should be easy enough to knock up with a for loop (but make sure you have a LOT of memory first).
Wouldn't a persistent data store be a better option in the long run?