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https://issues.apache.org/jira/browse/COLLECTIONS-666?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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BELUGA BEHR updated COLLECTIONS-666:
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Component/s: List
> ListUtils Union Method
> ----------------------
>
> Key: COLLECTIONS-666
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-666
> Project: Commons Collections
> Issue Type: Improvement
> Components: List
> Affects Versions: 4.2
> Reporter: BELUGA BEHR
> Priority: Trivial
>
> {code}
> public static <E> List<E> union(final List<? extends E> list1, final List<?
> extends E> list2) {
> final ArrayList<E> result = new ArrayList<E>(list1);
> result.addAll(list2);
> return result;
> }
> {code}
> Maybe we should create the _result_ list with the size of list1 + list 2,
> then perform two add all. This will prevent the ArrayList from being
> re-sized on the addAll step.
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