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Groups > comp.lang.java.programmer > #34747

Re: Two surprises in for (:)

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On 7/1/16 12:07 PM, Eric Sosman wrote:
> On 7/1/2016 1:55 PM, Mike Amling wrote:
>> I was surprised that the javac compiler accepted the following:
>>
>> String[] foo={"a", "b"};
>> for (final String who : foo) {
>> }
>>
>> because it seems strange to have a for loop's variable work when final.
>
>     Well, the "for loop's variable" is not a particularly rigorous
> description.  Examples:
>
>     for (int i=0,j=10; i < j; ++i,--j) ...
>
>     for (; !theList.isEmpty(); theList.remove(0)) ...
>
> Neither of these has a unique obvious "loop variable."
>
>> After all,
>>
>> for (final int i=0; i<7; ++i) {
>> }
>>
>> gets an error.
>
>     Yes, and I think that's unfortunate.  Sometimes I want to use
> `i' in a lambda expression (or in a nested class), and I must write
>
>     for (int i = 0; i < 7; ++i) {
>         final int iFinal = i;
>         // use iFinal in the lambda
>     }

Or something along the lines: IntStream.range(0, 7).forEach(i -> 
doSomethingWithLambda(() -> doSomethingWith(i));

 > [snip]

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Thread

Two surprises in for (:) Mike Amling <mamling@chaff.us> - 2016-07-01 12:55 -0500
  Re: Two surprises in for (:) Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-01 15:07 -0400
    Re: Two surprises in for (:) Daniel Pitts <usenet@coloraura.com> - 2016-07-01 15:08 -0700

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