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lollipop190 avatar lollipop190 commented on June 27, 2024

来自助教的优质解答！

用户参数是我定义的一个概念，我也没找到它的准确叫法。但是这个用户参数是有存在意义的。
选项是可以带参数也可以不带参数，比如-s就规定没有参数，这个时候arg0和-s没有任何关系。
并且参数的数量也是可以指定的，不一定只有一个，有相关的API可以做到这个事情。
选项如果带有N个参数，那么程序会默认把-*后面的N个字符串当成这个选项的参数，当然这些字符串不能带有“-”，否则会被认为是另一个选项。

用一个好理解的说法就是所有的选项指定了一些和程序相关的属性，而用户参数才是真正程序关注的东西
比如你要吃饭，选项可以更改你使用的餐具，但是用户参数指的是你吃什么，没有用户参数你显然无法完成吃饭这件事，但是你使用的什么餐具对整件事影响很小，它只是一个附带的属性
题目里只不过是没有处理用户参数，并不意味着所有的程序都不需要用户参数

getArgs获取的是全部用户参数
getOptionValue里需要传入某个选项的名字，然后回返回一个string数组，这就是这个选项的所有参数

from 2020se1-faq.

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