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From: =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne@vajhoej.dk>
Newsgroups: comp.lang.java.programmer
Subject: Re: Removing an element while iterating over a List with enhanced for?
Date: Wed, 15 Feb 2017 22:43:37 -0500
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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