Java: convert HashMap values to Set<Integer>

Question

One more question about HashMap<> in Java:

I have the following

Map<String, Set<Integer>> myWordDict = new HashMap<String, Set<Integer>>();

After storing data into the variable myWordDict, I want to iterate through the HashMapValues, and add each value to a new Set variable?

When I try to do Set<Integer> newVariable = myWordDict.entrySet(), it seems the data type is incompatible.

So my question is essentially:

how to convert HashMap values or entrySet() to Set ?

Thanks

Answer 1

Try:

Set<Integer> newVariable = mywordDict.keySet();

or

Set<Integer> newVariable = new HashSet<Integer>(myWordDict.values());

Answer 2

Your declaration should be like below. It will convert your map values to Collection

  Collection<Set<Integer>> newVariable = myWordDict.values();