SmallEnumIteratorRemoveResilience.java revision 4248
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04e26df8231b128a0b16be3058051f5b60bd60e2mental * Portions Copyright (c) 2011 IBM Corporation
6853ce5c70efff66131398da552b7c2de99926bemental * @bug 7014637
6853ce5c70efff66131398da552b7c2de99926bemental * @summary EnumSet's iterator.remove() can be resilient to set's modification.
6853ce5c70efff66131398da552b7c2de99926bemental * @author Neil Richards <neil.richards@ngmr.net>, <neil_richards@uk.ibm.com>
6853ce5c70efff66131398da552b7c2de99926bemental // enum with less than 64 values
6853ce5c70efff66131398da552b7c2de99926bemental public static void main(final String[] args) throws Exception {
6853ce5c70efff66131398da552b7c2de99926bemental final Set<SmallEnum> set = EnumSet.noneOf(SmallEnum.class);
c085c61313b7d55dfcccc6e21ac84a9ef0c43eb4mental // The Java API declares that the behaviour here - to call
6853ce5c70efff66131398da552b7c2de99926bemental // iterator.remove() after the underlying collection has been
6853ce5c70efff66131398da552b7c2de99926bemental // modified - is "unspecified".
6853ce5c70efff66131398da552b7c2de99926bemental // However, in the case of iterators for EnumSet, it is easy to
6853ce5c70efff66131398da552b7c2de99926bemental // implement their remove() operation such that the set is
6853ce5c70efff66131398da552b7c2de99926bemental // unmodified if it is called for an element that has already been
6853ce5c70efff66131398da552b7c2de99926bemental // removed from the set - this being the naturally "resilient"
6853ce5c70efff66131398da552b7c2de99926bemental // behaviour.
6853ce5c70efff66131398da552b7c2de99926bemental private static void checkSetAfterRemoval(final Set<SmallEnum> set,
6853ce5c70efff66131398da552b7c2de99926bemental throw new Exception("Test FAILED: Unexpected set size after removal; expected '" + (origSize - 1) + "' but found '" + set.size() + "'");
6853ce5c70efff66131398da552b7c2de99926bemental throw new Exception("Test FAILED: Element returned from iterator unexpectedly still in set after removal.");