您还可能会考虑检查空的字符串值。
You might also consider checking for empty string values. A user could specify a blank value surrounded by double quotes.
它们分别返回一个空的字符串值或者一个空的String数组。
Return, respectively, an empty string value or an empty string array.
应验证函数的每个输入并且应由您的要求来确定如何响应null或空的字符串输入。
Each of the inputs to the function should be validated and your requirements should determine the responses to null or empty string inputs.
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