Add multiple values to the current list of values for the supplied key. If the supplied array of new values is empty,
method returns immediately. Method throws a NullPointerException if the supplied array of values is
null.
Add all the values from the supplied value list to the current list of values for the supplied key. If the supplied
value list is empty, method returns immediately. Method throws a NullPointerException if the supplied array
of values is null.
Compare the specified map with this map for equality modulo the order of values for each key. Specifically, the
values associated with each key are compared as if they were ordered lists.