[jdom-interest] Stack & Threads

[Alex Rosen]

> The concurrent modification checking follows the collections model with
> "fail fast" behavior -- actions aren't synchronized, but you do get an
> exception if the data you're relying on has been altered by another
> thread.

... or in the same thread, but not via the iterator. The
concurrent-modification-checking code is only in the iterator, so that we'll
fail-fast if someone changes the underlying list out from under us.

Alex