How to convert map to List in java?

Assuming map is your instance of Map :
map.values() will return a Collection containing all of the map's values
map.keys() will return a Set containing all of the map's keys
map.entrySet() will return a Set containing all map key value pairs.

Get list of keys

List<String> list = new ArrayList<String>(map.keySet());

Get list of values

List<String> list = new ArrayList<String>(map.values());