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Re: Why is that in JDK8: value used in lambda expression shuld be effectively final?

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On 02/01/13 15:08, jeti789@web.de wrote:
> Anyhow, this news does [not] really put a smile on my face. Guess it's really time to look for another JVM-based language like Groovy or Scala ;-).

For your particular case:

   List<Integer> ints = ...;
   int sum = 0;
   ints.forEach(i -> { sum += i; });

...the recommended way is to use something like:

   int sum = ints.reduce(0, (x, y) -> x + y);

...which is more parallel-friendly.  Of course, if you don't care about 
the parallelism, it's simply:

   int sum = 0;
   for (int i : ints)
     sum += i;

I'm sure you're just using this example to explore what's available, and 
I think it would be a mistake to discard Java based on it.  So is there 
a more sophisticated case you were hoping would improve with lambdas?


-- 
ss at comp dot lancs dot ac dot uk

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Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? jeti789@web.de - 2013-01-02 07:08 -0800
  Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? jeti789@web.de - 2013-01-02 07:52 -0800
  Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-02 17:33 +0000
    Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Saxo <jeti789@web.de> - 2013-01-02 11:31 -0800
      Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Lew <lewbloch@gmail.com> - 2013-01-02 12:52 -0800
        Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-01-02 20:58 -0400
          Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Lew <lewbloch@gmail.com> - 2013-01-02 17:40 -0800
            Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-01-03 20:43 -0400
        Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Saxo <jeti789@web.de> - 2013-01-02 23:44 -0800
          Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Patricia Shanahan <pats@acm.org> - 2013-01-03 07:57 -0800
            Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Lew <lewbloch@gmail.com> - 2013-01-03 13:22 -0800
              Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Patricia Shanahan <pats@acm.org> - 2013-01-03 16:14 -0800
      Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-02 21:46 +0000
        Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Lew <lewbloch@gmail.com> - 2013-01-02 17:35 -0800
        Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Saxo <jeti789@web.de> - 2013-01-03 02:13 -0800
          Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Saxo <jeti789@web.de> - 2013-01-03 06:45 -0800
            Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-04 21:32 +0000
              Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2013-01-04 14:38 -0800
                Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-04 23:45 +0000
                Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2013-01-04 17:24 -0800
                Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-05 13:20 +0000
              Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Saxo <jeti789@web.de> - 2013-01-05 01:50 -0800
                Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-05 11:21 +0000
                Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Saxo <jeti789@web.de> - 2013-01-05 04:27 -0800
                Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-05 12:58 +0000

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