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Ilkka Seppälä 2014-08-24 10:11:53 +03:00
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##Singleton
**Intent:** Ensure a class only has one instance, and provide a global point of access to it.
![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/singleton/etc/singleton.jpg "Singleton")
**Applicability:** Use the Singleton pattern when
* the must be exactly one instance of a class, and it must be accessible to clients from a well-known access point
* when the sole instance should be extensible by subclassing, and clients should be able to use an extended instance without modifying their code
##Adapter
**Intent:** Convert the interface of a class into another interface clients expect. Adapter lets classes work together that couldn't otherwise because of incompatible interfaces.