Finding Key associated with max Value in a Java Map

For completeness, here is a java-8 way of doing it

countMap.entrySet().stream().max((entry1, entry2) -> entry1.getValue() > entry2.getValue() ? 1 : -1).get().getKey();

or

Collections.max(countMap.entrySet(), (entry1, entry2) -> entry1.getValue() - entry2.getValue()).getKey();

or

Collections.max(countMap.entrySet(), Comparator.comparingInt(Map.Entry::getValue)).getKey();