Re: Removing object from arraylist when pointed to by iterator

From:

Daniel Pitts <newsgroup.spamfilter@virtualinfinity.net>

Newsgroups:

comp.lang.java.programmer

Date:

Sun, 24 Aug 2008 08:21:41 -0700

Message-ID:

<48b17c30$0$17621$7836cce5@newsrazor.net>

softwarepearls_com wrote:

On Aug 24, 3:00 am, "nooneinparticular314...@yahoo.com"
<nooneinparticular314...@yahoo.com> wrote:

I have an arraylist of objects of a certain type. I use an iterator
on that arraylist to get the next instance of the object, using the
iterator.next() method. But if I succeed in performing an operation
on the object, I want to remove the object from my arraylist. The
question is how I remove it without calling .next() again, since that
will remove the next one, not the current one? ie. If I am currently
working on the object at position 4 in the arraylist (through the
iterator), I want to remove the object at position 4. But I don't
know what position the object is in because I got it through the
iterator.

I would say you're caught in the iterator "routine" so many fall prey
to... you should not be using an iterator when working with an
ArrayList ! You should be iterating the "old fashioned" way ... using
direct get(int) .. these don't entertain the concept of
ConcurrentModificationException. It's faster too.

Lies!

You don't see the concurrent modification errors, but they still can
cause bugs in your code!
Also, It isn't necessarily faster. I would assume its "about the same"
for the average program, but the benefits of using an iterator far
outweigh the cost for the average program. Fewer bugs, bugs caught
sooner, etc...
--
Daniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/>