可应用值：您可以为数据验证限定符设置为以下值，取决于您的应用程序的设计和需求。

Applicable values: you can set the data validation qualifier to either of the below values, depending on the design and requirements of your business application.

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实现层次结构在Scala中的效果是相同的：我们可以向方法应用final来防止子类覆盖它，也可应用于类声明本身来防止继承。

Implementation hierarchy works the same way in Scala: We can apply final to the method to prevent a child class from overriding it or to the class declaration itself to prevent derivatives.

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