用工厂方法替换构造函数。

Convert Property to Auto-Property Introduce Field Replace Constructor with Factory method.

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注：PUT方法替换整个产品实体。

Note: the PUT method replaces the entire product entity.

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在默认源代码中使用类路径的地方，可以用查询类文件的其他路径或者其他访问类信息的方法替换。

You can substitute other paths for looking up class files, or other ways of accessing class information, in place of the default source that USES the classpath.

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