[Java] How to get the maximum value of HashMap

public static void main(String[] args) {
  String arr[] = {"a", "a", "a", "a", "b", "b", "b", "c", "c", "d"};
  Map<String, Integer> map = new HashMap<>();

//Store array elements in a map
  for (String string : arr) {
    if (map.get(string) == null) {
      map.put(string, 1);
    } else {
      map.put(string, map.get(string) + 1);
    }
  }

//Initialize the maximum value and the key at that time
  String maxKey = null;
  Integer maxValue = 0;

//Get the map key and Value one by one with the entrySet method
for (Map.Entry<String, Integer> entry : map.entrySet()) {

//Compare the maximum value and Value, and if Value is large, substitute the key and Value at that time.
  if (entry.getValue() > maxValue) {
    maxKey = entry.getKey();
    maxValue = entry.getValue();
  }
}
System.out.println(maxKey + " : " + maxValue);

a : 4

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