The setValue() method on iterators will succeed only if the new value being set is not already in the bidimap.
When considering whether to use this class, the {@link TreeBidiMap} class shouldalso be considered. It implements the interface using a dedicated design, and does not store each object twice, which can save on memory use.
NOTE: From Commons Collections 3.1, all subclasses will use {@link TreeMap}and the flawed createMap
method is ignored.
@since 3.0
@version $Id: DualTreeBidiMap.java 1479122 2013-05-04 15:08:41Z tn $
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