How to get 5 highest values from a hashmap?

Question

I have a Hashmap that links a zipcodes stored as keys and population stored as values in a hashmap.

The hashmap contains around 33k entries.

I\'m trying to get t

Answer 1

Try this, using standard methods and assuming that the population count is stored as Integers in the HashMap:

List list = new ArrayList(zipCodePop.values());
Collections.sort(list, Collections.reverseOrder());
List top5 = list.subList(0, 5);