Question

Iterator it = myHashMap.keySet().iterator();
while (it.hasNext()) {
   int next = it.next();
}

That doesn’t work because it.next() returns Object. My hashmap uses ints for keys. All of my methods accept ints to access the hashmap. How can I actually get an int value when looping through my keys so I can pass it to my other methods?

Answer 1

You should use generics.

 Map<Integer, Object> myHashMap;

This gives you keys that are Integer (not int, but that cannot be helped). Integer can be automatically unboxed:

for (int key : myHashMap.keySet()){

}

If you want your keys in ascending order, consider using TreeMap instead of HashMap.