Therefore the JSR 168 API differentiates whether a value is set or not by specifying a default value that is returned if no value is set.

因此，如果没有设定值的话是否通过指定一个返回的默认值，JSR 168 API 是区别对待的。

youdao

Global default values may vary upon whether a request is authenticated or not.

请求验证与否可能会影响全局缺省值。

youdao

The db2audit.log file does not exist by default and will not exist until audit records are generated or the audit buffer is flushed.

log 文件在默认情况下并不存在，只有在生成了审计记录或者刷新了审计缓冲区的情况下，该文件才会出现。

youdao

While a sovereign default in any one of these European countries would not have a lasting or consequential impact on the capital markets as a whole, the real risk here, in my opinion, is the contagion effect that could spread to other larger European economies should the default not be contained to any one or two of the smaller economies.

FORBES: Raising The Debt Ceiling Is Just Kicking The Can Further Down The Road

We do control whether or not we default.

WHITEHOUSE: Press Briefing

Ryan also knows that a default is not up to him, or Congress.

FORBES: What a US Default, Downgrade Might Look Like