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Date: Fri, 12 Aug 2011 12:26:14 -0700
From: Patricia Shanahan <pats@acm.org>
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Subject: Re: Trying to Understand Purpose of a Catch Block for IOException in the Presence of One for FileNotFound
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On 8/12/2011 12:08 PM, markspace wrote:
> On 8/12/2011 11:19 AM, KevinSimonson wrote:
>> new FileWriter( arguments[ 1])));
>
>> So try running this program and doing various things to the two
>> files. If you can find something that actually generates a
>> <IOException>, please, _please_, let me know what you did!
>
>
> The FileWriter constructor is declared to generate an IOExcpetion. I
> don't have time to mess with it, but it's likely a large variety of
> network file systems could generate an IO error of various types.
>
> While any other error might be swallowed by the PrintWriter, you are
> briefly exposed to the vagaries file system while that constructor is
> running.

As currently implemented, I believe FileNotFoundException is the only
checked exception the FileWriter constructors throw. However, designers
of an API that may be very difficult to change should take a broad view
of what checked exceptions they might need to throw in the future.

Patricia