1. Strategy Pattern Albert Guo junyuo@gmail.com

2. Motivation Intent Implementation Applicability & Examples 2 Agenda

3. There are common situations when classes differ only in their behavior. For this cases is a good idea to isolate the algorithms in separate classes in order to have the ability to select different algorithms at runtime. Motivation 3

4. Define a family of algorithms, encapsulate each one, and make them interchangeable. Strategy lets the algorithm vary independently from clients that use it. 4 Intent

5. 5 Implementation

6. 6 Implementation – cont.

7. Applicability & Examples 7

8. 8 Applicability & Examples – cont.

9. 9 Applicability & Examples – cont.

10. 10 Applicability & Examples – cont.