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NNTP-Posting-Date: Tue, 23 Apr 2013 13:33:11 -0500
Date: Tue, 23 Apr 2013 19:33:09 +0100
From: lipska the kat <"nospam at neversurrender dot co dot uk">
Organization: Trollbusters 3
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Subject: Re: <? extends String>
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On 23/04/13 17:58, Daniel Pitts wrote:
> On 4/23/13 9:30 AM, lipska the kat wrote:
>> On 23/04/13 16:50, Daniel Pitts wrote:
>>> On 4/23/13 8:37 AM, lipska the kat wrote:
>>>> On 23/04/13 14:55, Steven Simpson wrote:
>>>>> On 23/04/13 11:31, Donkey Hottie wrote:
>>>>>> 23.04.2013 12:48, Steven Simpson kirjoitti:
>>>>>>> public static String generateWindowsArgument(List<? extends String>
>>>>>>> args) {
>>>>>> <offtopic>java.lang.String is final, so nothing can extend it.
>>>>>> </offtopic>
>>>>>
>>>>> It's a matter of habit drawn from the general principle that if I
>>>>> don't
>>>>> need to modify the list, I don't impose the additional, unnecessary
>>>>> constraint on the caller, regardless of the element type.
>>>>
>>>> I don't understand this. In the first place List<? extends String>
>>>> says
>>>> nothing about your ability to modify the list, you can add and remove
>>>> Strings to your hearts content,
>>> Wrong.
>>>
>>> List<? extends String> listOfStuff = new ArrayList<String>();
>>>
>>> listOfStuff.add("foo"); // compiler error here!
>>
>> erk, you're right, well I never, however it doesn't say anything about
>> the list outside of the method, how therefor does it avoid 'impose[ing]
>> the additional, unnecessary constraint on the caller' what constraint
>> does it avoid ?
> In *this* case none.

Actually, in a way, List<? extends String> as a parameter to a method 
might be considered as breaking encapsulation ... you are actually 
exposing part of the internal workings of a component.

>  In the General case.

Yes well this isn't the general case and I'm not convinced that writing
List<? extends String> as a parameter type because one day in the 
distant future String might be mutable is a reason to do it, it's nasty 
pointless and unnecessary complexity.

Just my opinion of course. :-)


lipska

-- 
Lipska the KatŠ: Troll hunter, sandbox destroyer
and farscape dreamer of Aeryn Sun