Java 8 List<V> into Map<K, V>
Based on Collectors documentation it's as simple as:
Map<String, Choice> result = choices.stream().collect(Collectors.toMap(Choice::getName, Function.identity()));
If your key is NOT guaranteed to be unique for all elements in the list, you should convert it to a Map<String, List<Choice>> instead of a Map<String, Choice>
Map<String, List<Choice>> result = choices.stream().collect(Collectors.groupingBy(Choice::getName));
Use getName() as the key and Choice itself as the value of the map:
Map<String, Choice> result = choices.stream().collect(Collectors.toMap(Choice::getName, c -> c));