ConcurrentModificationException

        Set set = new HashSet(Arrays.asList(1, 2));
        Iterator iterator = set.iterator();
        while (iterator.hasNext()) {
            set.remove(2);
            iterator.next();
        }


Exception in thread "main" java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
	at java.util.HashMap$KeyIterator.next(HashMap.java:828)
	at com.sabre.ticketing.tktdoc.validation.rules.Test.main(Test.java:20)


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