iterator

This method accesses the value of a Map entry, using a key that was
retrieved from a keySet iterator.
It is more efficient to use an iterator on the entrySet of the map, to
avoid the Map.get(key) lookup.

Change-Id: If7323c00ba8423c8eb2f4919069ad7d41378e154
Signed-off-by: Carsten Hammer <carsten.hammer@t-online.de>