Notice what it says. I'm going to pass in 1 a string, call it s, binds it locally, and it says the following.
然后看接下来的内容,接下来说的是如果这个字符串的长度等于,那么我就成功了。
Don't worry. I'm sure you will pass the next test.
别担心。我相信下次你肯定能通过的。
So the exceptions are useful when you want to have the ability to say, I expect in general this kind of behavior, but I do know there are some other things that might happen and here's what I'd like to do in each one of those cases. But I do want to make sure that I don't let a value that I'm not expecting pass through.
所以当你希望有能力说,我希望一般是这样的行为,异常是很有用的,但是我明白还有一些其它的情况可能发生,我希望对每一种情况都这么做,但是我跟希望能保证,没有让一个预期之外的情况漏过去。
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