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Added anchors to frequently asked questions.

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Ilkka Seppälä 2015-03-21 15:41:33 +02:00
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@ -415,15 +415,15 @@ Behavioral patterns are concerned with algorithms and the assignment of responsi
# Frequently asked questions # Frequently asked questions
**Q: What is the difference between State and Strategy patterns?** **<a id="Q1">Q: What is the difference between State and Strategy patterns?</a>**
While the implementation is similar they solve different problems. The State pattern deals with what state an object is in - it encapsulates state-dependent behavior. The Strategy pattern deals with how an object performs a certain task - it encapsulates an algorithm. While the implementation is similar they solve different problems. The State pattern deals with what state an object is in - it encapsulates state-dependent behavior. The Strategy pattern deals with how an object performs a certain task - it encapsulates an algorithm.
**Q: What is the difference between Strategy and Template Method patterns?** **<a id="Q2">Q: What is the difference between Strategy and Template Method patterns?</a>**
In Template Method the algorithm is chosen at compile time via inheritance. With Strategy pattern the algorithm is chosen at runtime via composition. In Template Method the algorithm is chosen at compile time via inheritance. With Strategy pattern the algorithm is chosen at runtime via composition.
**Q: What is the difference between Proxy and Decorator patterns?** **<a id="Q3">Q: What is the difference between Proxy and Decorator patterns?</a>**
The difference is the intent of the patterns. While Proxy controls access to the object Decorator is used to add responsibilities to the object. The difference is the intent of the patterns. While Proxy controls access to the object Decorator is used to add responsibilities to the object.