Java HashMap key value storage and retrieval

Question

I want to store values and retrieve them from a Java HashMap.

This is what I have so far:

public void processHashMap()
{
    HashMap hm = new HashMap         


        

Answer 1

You can use keySet() to retrieve the keys. You should also consider adding typing in your Map, e.g :

Map<Integer, String> hm = new HashMap<Integer, String>();
hm.put(1,"godric gryfindor");
hm.put(2,"helga hufflepuff"); 
hm.put(3,"rowena ravenclaw");
hm.put(4,"salazaar slytherin");

Set<Integer> keys = hm.keySet();