When using a HashMap are values and keys guaranteed to be in the same order when iterating?

Question

When I iterate over the values or keys are they going to correlate? Will the second key map to the second value?

Answer 1

No, not necessarily. You should really use the entrySet().iterator() for this purpose. With this iterator, you will be walking through all Map.Entry objects in the Map and can access each key and associated value.

Answer 2

to use the entrySet that @Cuchullain mentioned:

Map<String, String> map = new HashMap<String, String>();

// populate hashmap

for (Map.Entry<String, String> entry : map.entrySet()) {
  String key = entry.getKey();
  String value = entry.getValue();
  // your code here
}