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Ilkka Seppälä 2014-08-24 20:03:29 +03:00
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##Flyweight
**Intent:** Use sharing to support large numbers of fine-grained objects efficiently.
![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/flyweight/etc/flyweight.jpg "Flyweight")
**Applicability:** The Flyweight pattern's effectiveness depends heavily on how and where it's used. Apply the Flyweight pattern when all of the following are true
* an application uses a large number of objects
* storage costs are high because of the sheer quantity of objects
* most object state can be made extrinsic
* many groups of objects may be replaced by relatively few shared objects once extrinsic state is removed
* the application doesn't depend on object identity. Since flyweight objects may be shared, identity tests will return true for conceptually distinct objects.
##Proxy
**Intent:** Provide a surrogate or placeholder for another object to control access to it.