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Stamatis Pitsios 2014-09-11 16:10:38 +03:00
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* 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
##Model-View-Presenter
**Intent:** Apply a "Separation of Concerns" principle in a way that allows developers to build and test user interfaces.
![alt text](https://github.com/pitsios-s/java-design-patterns/blob/master/model-view-presenter/etc/model-view-presenter.jpg "Model-View-Presenter")
**Applicability:** Use the Model-View-Presenter in any of the following situations
* when you want to improve the "Separation of Concerns" principle in presentation logic
* when a user interface development and testing is necessary.
##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.