Re: what happen in for (x:List) and iterator when adding to List
Thank you all.
Thanks for the remind about javadoc. I should have read about it.
What I am trying to do is the build-up the breadth-first tree
traverse from a node in a graph if you are familiar with data
structure. This can be accomplished by a "link-list" or array in the
traditional data structure sense. I have one node at first. Then I
add all the connected NEW nodes of the current node to the end while
going through the link-list. I just figure it might be quicker and
safer to use something ready in java rather than building my own. But
there seems to be no mechanism in collection framework. The two for
coupling should work, but it would be inefficient because it checks
the connection of those nodes that I have already checked. I am using
java 5. So I cannot use Deque.
Any suggestion?
Sincerely
Zhu, Guojun
On Sep 25, 2:54 am, George <zgg...@gmail.com> wrote:
Hi,
I need to do a breadth-first search on a graph. So I need to have a
list for element and iterator over it while keep adding element in the
end of the list. I am currently using ArrayList in java 5. I
remembered vaguely something about the iterator is unpredictable when
the collection changed. Is it true?
Can I use
List<E> list=new ArrayList<E>;
.....
for (ListIterator<E> it = list.listIterator(); it.hasNext(); )
{....; list.add(x);
}
or can I use
for (x:list){
....; list.add(x);
}
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