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Groups > comp.lang.java.programmer > #36279

Re: Removing an element while iterating over a List with enhanced for?

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On 2/15/2017 5:56 PM, Knute Johnson wrote:
> An enhanced for loop on a List is no different than using an Iterator
> right?  So is there any problem removing the current element from the
> list while using the enhanced for loop?  I couldn't find anything that
> said it was OK or not OK in the JLS.

>         List<Integer> list = Stream.of(1,5,7,9,13).collect(toList());
>
>         for (Integer i : list)
>             if (i == 9)
>                 list.remove(i);
>
>         list.forEach(System.out::println);
>
>         list = Stream.of(1,5,7,9,13).collect(toList());
>
>         Iterator<Integer> iter = list.iterator();
>
>         while (iter.hasNext())
>             if (iter.next() == 9)
>                 iter.remove();
>
>         list.forEach(System.out::println);

Since you are already using streams and lambdas then why not:

list = list.stream().filter(v -> v != 9).collect(toList());

?

Arne

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Thread

Removing an element while iterating over a List with enhanced for? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2017-02-15 16:56 -0600
  Re: Removing an element while iterating over a List with enhanced for? Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-02-15 18:24 -0500
    Re: Removing an element while iterating over a List with enhanced for? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2017-02-15 17:51 -0600
  Re: Removing an element while iterating over a List with enhanced for? Arne Vajhøj <arne@vajhoej.dk> - 2017-02-15 22:43 -0500
    Re: Removing an element while iterating over a List with enhanced for? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2017-02-16 11:17 -0600
      Re: Removing an element while iterating over a List with enhanced for? Robert Klemme <shortcutter@googlemail.com> - 2017-02-16 18:30 +0100
        Re: Removing an element while iterating over a List with enhanced for? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2017-02-16 11:35 -0600
        Re: Removing an element while iterating over a List with enhanced for? Arne Vajhøj <arne@vajhoej.dk> - 2017-02-16 14:02 -0500
        Re: Removing an element while iterating over a List with enhanced for? v_borchert@despammed.com (Volker Borchert) - 2017-02-16 20:09 +0000
          Re: Removing an element while iterating over a List with enhanced for? Robert Klemme <shortcutter@googlemail.com> - 2017-02-16 23:21 +0100

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