Java HashMap: How to get a key and value by index?

Question

I am trying to use a HashMap to map a unique string to a string ArrayList like this:

HashMap<String, ArrayList<String>> 

Basically, I want to be able to access the keys by number, not by using the key's name. And I want to be able to access said key's value, to iterate over it. I'm imagining something like this:

for(all keys in my hashmap) {     for(int i=0; i < myhashmap.currentKey.getValue.size(); i++) {         // do things with the hashmaps elements     } } 

Is there an easy way to do this?

Answer 1

Here is the general solution if you really only want the first key's value

Object firstKey = myHashMap.keySet().toArray()[0]; Object valueForFirstKey = myHashMap.get(firstKey);