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[Java] Updating data
Say in a inventory system scenario where User 1 calls up this particular product data object that contains information including quantity in stock. If for some reason, user 1 goes away from his desk for awhile. User 2 comes along and calls up the same data on his computer and then updates it. User 1 will no longer have the most recent information.
What's the best way to ensure that User 1 does get the most recent data?
I'm not really programming this thing, I'm just thinking theortically.
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