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Added real world example for Memento.

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Ilkka Seppälä
2015-02-25 21:04:31 +02:00
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@ -292,6 +292,8 @@
* a snapshot of an object's state must be saved so that it can be restored to that state later, and
* a direct interface to obtaining the state would expose implementation details and break the object's encapsulation
**Real world examples:**
* [java.util.Date](http://docs.oracle.com/javase/6/docs/api/java/util/Date.html)
## <a name="observer">Observer</a> [&#8593;](#list-of-design-patterns)
**Intent:** Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.