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NNTP-Posting-Date: Tue, 23 Apr 2013 13:07:03 -0500
Date: Tue, 23 Apr 2013 21:06:10 +0300
From: Donkey Hottie <donkey@fredriksson.dy.fi>
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Subject: Re: <? extends String>
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Xref: csiph.com comp.lang.java.programmer:23591

23.04.2013 19:58, Daniel Pitts kirjoitti:
>>>> 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.
>>>>
> 
> List<? extends MyFoo> fooList1;
> List<MyFoo> fooList2;
> 
> fooList1 can be assigned an instance of List<MyFoo>, or List<MySubFoo>.
> fooList2 can *only* be be assigned an instance of List<MyFoo>, not
> List<MySubFoo>.  This is an unnecessary constraint on the caller.
> 
> Again, in the case of "String", there isn't a difference. but that is a
> special edge case which needn't change the general behavior.

Thanks for the explanation and discussion. I'm a bit wiser now.

-- 

Today is the first day of the rest of the mess.