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Ilkka Seppälä 2014-08-24 23:05:51 +03:00
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##Memento ##Memento
**Intent:** Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later. **Intent:** Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later.
![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/memento/etc/memento.jpg "Memento")
**Applicability:** Use the Memento pattern when
* 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
##Observer ##Observer
**Intent:** Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. **Intent:** Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.