Retrieve all values from HashMap keys in an ArrayList Java

Question

Good day, this is kind of confusing me now(brain freeze!) and seem to be missing something. Have an ArrayList which i populate with a HashMap. now i put in my HashMap and arrayl

Answer 1

List constructor accepts any data structure that implements Collection interface to be used to build a list.

To get all the keys from a hash map to a list:

Map map = new HashMap();
List keys = new ArrayList<>(map.keySet());

To get all the values from a hash map to a list:

Map map = new HashMap();
List values = new ArrayList<>(map.values());