Re: Collection implementations and fail-fast iterator problems.
Daniel Pitts wrote:
Eric Sosman wrote:
Daniel Pitts wrote On 11/02/07 17:06,:
I have a simulation where I visit every element in a Collection.
While visiting these, I may find out that I want to add a new
element, or remove some later-occurring element before I get to it.
I have a few Collections like this.
I'd like to avoid having to keep track of "to-be-deleted" and
"to-be-added" elements, but I don't see an elegant way to handle
both those cases without getting a ConcurrentModificationError.
If your Collection implements List, perhaps you could
use a ListIterator.
How does that help? Adding and Removing STILL causes concurrent
modification errors, does it not?
Not if you use the Iterator to do the modifications:
From the ListIterator Javadocs:
An iterator for lists that allows the programmer to traverse the list
in either direction, modify the list during iteration, and obtain the
iterator's current position in the list.
Can you add to a ListIterator while iterating over it? With Iterator I
thought you could only delete the current iterated item.
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