The Strategy Pattern:
仔细审查下面的原理：
1 "Program to an interface, not an implementation."
2 "Favor object composition over class inheritance."
3 "Consider what should be variable in your design.
4 "encapsulate the concept that varies."
Define a family of algorithms, encapsulate each one, and
make them interchangeable. Strategy lets the algorithm
vary independently from the clients that use it.
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