工厂模式

https://hanyu.baidu.com/shici/s?wd=%E9%83%91%E5%B7%9E%E9%87%91%E6%B0%B4%E5%8C%BA%E7%87%95%E5%BA%84%E6%9C%8D%E5%8A%A1%E7%A1%AE%E5%AE%9E%E6%AD%A3%E5%9C%A8%E5%B0%8F%E5%A6%B9%E5%95%AA%E5%95%AA%E5%95%AA%E6

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