If this were more than a demo, some other logic would choose the parameter, perhaps prompting the user to supply the information.

如果这不仅仅是一个演示的话，某些其他的逻辑将选择参数，可能会提示用户提供该信息。

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This method expects a String user role-name parameter.

此方法接受一个用户角色名的字符串参数。

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For example, add the s parameter to boot into single user mode.

例如，添加参数s启动到单用户模式。

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