java.util.ConcurrentModificationException, but it is pretty ugly.
List< Item > newItems = new LinkedList< Item >(); for (Item item : items) { if (item.isAType() ) { newItems.add(item); } } items = new LinkedList< Item >(); items.addAll(newItems);
As Part of reading that "5 Things you didn't know" series from IBM mentioned in a previous blog entry.
A much neater way is using the remove() method on an Iterator:
for (Iterator< Item > itemsIter = items.iterator(); itemsIter.hasNext();) { if (itemsIter.next().isAType()) { itemsIter.remove(); } }
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