Description: The strategy pattern defines a family of algorithms, encapsulates each algorithm, and make them interchangeable. Strategy lets the algorithm independent of the use of its customers and the independent variation.
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2.策略模式\AddStrategy.java
..........\Client.java
..........\DivideStrategy.java
..........\Environment.java
..........\MultiplyStrategy.java
..........\Strategy.java
..........\SubtractStrategy.java
2.策略模式