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Ilkka Seppälä 2014-08-24 09:55:35 +03:00
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##Prototype
**Intent:** Specify the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype.
![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/prototype/etc/prototype.jpg "Prototype")
**Applicability:** Use the Prototype pattern when a system should be independent of how its products are created, composed and represented; and
* when the classes to instantiate are specified at run-time, for example, by dynamic loading; or
* to avoid building a class hierarchy of factories that parallels the class hierarchy of products; or
* when instances of a class can have one of only a few different combinations of state. It may be more convenient to install a corresponding number of prototypes and clone them rather than instantiating the class manually, each time with the appropriate state
##Singleton
**Intent:** Ensure a class only has one instance, and provide a global point of access to it.