Any performance overhead if we get iterator over values stored in map

Hi Everybody,
Is there any performance overhead if we get iterator over values stored in map. like this
Iterator itr = rolesMap.values().iterator();
if yes please explain...thanks in advance.

ejp wrote:
That's rather out of date. It is how Hashtable works, but as regards HashMap it isn't. The keySet() iterator and the values() iterator are both written in terms of the entrySet() iterator. There is no skipping over unused slots.Out of date? In that case there's been a recent advance in hashed data structures I've missed.
Or the HashMap implementation has been recently changed to internally link entries to improve iteration performance. I doubt that because such a list would degrade the performance of the HashMap in other ways and that's unacceptable (and unnecessary because of LinkedHashMap).
Besides, what I said is in the Java 6 API documentation to LinkedHashMap. It may be out of date but I doubt it.
So here we are with a fact of nature: Any iteration of a hash based data structure will be proportional to capacity rather than the number of entries, unless a supportive list style data structure is introduced to overcome this.

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Any performance overhead if we get iterator over values stored in map

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