Re: about ConcurrentModificationException?

Daniel Pitts <>
Sun, 02 Dec 2007 10:12:38 -0800
hiwa wrote:

On Dec 2, 11:51 am, Lew <> wrote:

rmn190 wrote:

    For the code above,why there is an exception
"ConcurrentModificationException" thrown when i want to remove the
String of "123" from myCollection,using the statement of
"myCollection.remove(myObject);"?and using the statement of
"it.remove()",there is not.

Javadocs are your friend.

The iterators returned by this class's iterator and listIterator methods are fail-fast:
if the list is structurally modified at any time after the iterator is created,
in any way except through the iterator's own remove or add methods,
the iterator will throw a ConcurrentModificationException.



I want to see/use iterator's own add method.
BTW new for loop for(T e : c) also throws CMF for standalone remove()

Yes, even though that loop uses an iterator to go through all the
elements, it does NOT provide a way to call add/remove on the iterators.
  If you need to do more than just examine each element, you need to use
some other construct.

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