java.util.ConcurrentModificationException with ArrayList

You will receive java.util.ConcurrentModicationException error, if you are modifying a list while iterating it. For example, the following code will throw you the exception: for (Object obj : list) {   if (obj.getCode().equals("something"))     list.remove(obj); } To avoid this exception, the trick is to delete/add an item through the iterator, but not the collection. Here is the example: Iterator it = list.iterator(); while (it.hasNext()) {   Object obj = (Object)it.next();   if...