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Regarding HashMaps:
https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html
import java.util.HashMap;
HashMap<String, String> userMap = new HashMap<String, String>();
https://docs.oracle.com/javase/tutorial/collections/interfaces/map.html
clear
, containsKey
, containsValue
,isEmpty
, keySet
, remove
, replace
, size
, values
. Try these out to see what you can do with HashMap
s.