https://www.zhihu.com/question/21346206
工厂方法模式，重点理解
https://blog.csdn.net/carson_ho/article/details/52343584
https://blog.csdn.net/fasfaf454/article/details/51254022
https://www.cnblogs.com/notDog/p/5420727.html
https://blog.csdn.net/cjm812752853/article/details/76222491
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