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Added real world example for Observer.

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Ilkka Seppälä 2015-02-25 21:07:40 +02:00
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@ -310,6 +310,8 @@
* changing in one object leads to a change in other objects
**Real world examples:**
* [java.util.Observer](http://docs.oracle.com/javase/6/docs/api/java/util/Observer.html)
## <a name="state">State</a> [&#8593;](#list-of-design-patterns)
**Intent:** Allow an object to alter its behavior when its internal state changes. The object will appear to change its class.