Learning a design pattern (strategy pattern)

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This link: https://blog.csdn.net/AinUser/article/details/99982926

Refer to the following article: https://www.cnblogs.com/lewis0077/p/5133812.html

Strategy pattern personal experience:

1. Clear the code may be a plurality if else

2. each policy can replace each other algorithms

3. If the policy is changed, the new interface implementation class directly to the basic need major changes

4. good scalability and maintainability