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

Another nice choice is to use MultiValuedMap from Apache Commons. Take a look at the All Known Implementing Classes at the top of the page for specialized implementations.

Example:

HashMap> map = new HashMap>()

could be replaced with

MultiValuedMap map = new MultiValuedHashMap();

So,

map.put(key, "A");
map.put(key, "B");
map.put(key, "C");

Collection coll = map.get(key);

would result in collection coll containing "A", "B", and "C".