Get Average Value of Two+ HashMap using Java 8

I have two `HashMap<String, Integer>` How can I get the average of the values? ``` HashMap<String, Integer> map1 = ... map1.put("str1", 7); map1.put("str2", 4); HashMap<String, Integer> map2 = ... map2.put("str1", 3); map2.put("str2", 2); ``` The expected output is: ``` ("str1") = 5; ("str2") = 3; ``` I am able to retrieve the sum of two maps as follows: ``` map2.forEach((k, v) -> map1.merge(k, v, Integer::sum)); ``` But how can I retrieve the average of two maps using Java 8? Update: At the request of @ I am posting a larger portion of my code: ``` HashMap<String, HashMap<String, Double>> map; HashMap<String, Double> map2 = new HashMap<String, Double>(); map = func1(); map = func2(); map = func3(); for (Entry<String, HashMap<String, Double>> entry : map.entrySet()) { String key = entry.getKey(); HashMap<String, Double> mp = map.get(key); mp.forEach((k, v) -> map2.merge(k, v, (t, u) -> (t + u) / 2)); for (Entry<String, Double> entry1 : mp.entrySet()) { StringfieldName = entry1.getKey(); Double score= entry1.getValue(); System.out.println(fieldName.toString() + " = " + score); } } return map2; } ```