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工厂模式 [工厂模式](https://github.com/guopingping/Design-pattern/blob/master/%E5%B7%A5%E5%8E%82%E6%A8%A1%E5%BC%8F.md)
[工厂模式](https://github.com/guopingping/Design-pattern/blob/master/%E5%B7%A5%E5%8E%82%E6%A8%A1%E5%BC%8F.md)
