HashMap with multiple values under the same key

Question

Is it possible for us to implement a HashMap with one key and two values. Just as HashMap?

Please do help me, also by telling (if there is no way) any other way to

Answer 1

If you use Spring Framework. There is: org.springframework.util.MultiValueMap.

To create unmodifiable multi value map:

Map> map = ...
MultiValueMap multiValueMap = CollectionUtils.toMultiValueMap(map);

Or use org.springframework.util.LinkedMultiValueMap