ImmutableListMultimap Sınıfı

inverse metodu
Şöyle yaparız

ImmutableListMultimap<Integer, String> originalMultimap = ImmutableListMultimap.of(
        1, "foo",
        1, "bar",
        2, "baz",
        42, "foo"
);
ImmutableListMultimap<String, Integer> convertedMap = originalMultimap.inverse();
System.out.println(convertedMap);   // {foo=[1, 42], bar=[1], baz=[2]}