完成年龄字段后，可能希望指定对名字字段的长度加以限制。

Once you have the age field sorted out, you might want to specify length restrictions on the first-name field. You could code this validation as follows.

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该新软件也可以将名字字段扩展为16到32个字。

The new software also expands name field from 16 to 32 characters.

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我们可以在register方法中添加验证代码，以确定名字字段是否为null。

We could add validation code to the register method to determine whether the first-name field is blank or null.

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