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By mitchp
via java.dzone.com
Published: Oct 22 2012 / 08:38

The Memento captures and externalizes an object’s internal state so that the object can later be restored to that state. Command can use Memento to maintain the state required for an undo operation. It lets you capture an object’s state so you can restore the object later, so it's very useful for an undo operation.
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