Two {@link HashMap} instances are used in this class.This provides fast lookups at the expense of storing two sets of map entries. Commons Collections would welcome the addition of a direct hash-based implementation of the {@link BidiMap} interface.
NOTE: From Commons Collections 3.1, all subclasses will use {@link HashMap}and the flawed createMap
method is ignored.
@since 3.0
@version $Id: DualHashBidiMap.java 1477745 2013-04-30 18:08:32Z tn $
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