How can I sort a list of maps by value of some specific key using Java 8?

Question

How can I sort a List of Map using Java 8? The map contains a key called last_name, and the value associated wit

Answer 1

Since your peopleList might contain a null and the Map::key might have a null value, you probably need to nullsLast twice:

peopleList.sort(Comparator.nullsLast(Comparator.comparing(m -> m.get("last_name"),
                            Comparator.nullsLast(Comparator.naturalOrder()))));