HashMap with multiple values under the same key

Question

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

Answer 1

1. Use a map that has a list as the value. Map<KeyType, List<ValueType>>
2. Create a new wrapper class and place instances of this wrapper in the map. Map<KeyType, WrapperType>
3. Use a tuple like class (saves creating lots of wrappers). Map<KeyType, Tuple<Value1Type, Value2Type>>
4. Use mulitple maps side-by-side