This week's giveaway is in the Java/Jakarta EE forum.
We're giving away four copies of Java EE 8 High Performance and have Romain Manni-Bucau on-line!
See You only need save your object into sesion or appliation scope, then use these objects when user access your page again.
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Following is the code to do as what Leon Fan said..

Suppose you are storing your data in ArrayList named data.

Hope I have made you more clear.

Consider Paul's rocket mass heater.
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