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Ilkka Seppälä committed 2014-08-23 08:50:03 +03:00
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##Observer ##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. **Intent:** Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.
##State
**Intent:** Allow an object to alter its behavior when its internal state changes. The object will appear to change its class.