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javatreemaps

Java: Maximum value in TreeMap

If I have a TreeMap:

TreeMap<String, Integer> map = new TreeMap<String, Integer>();

I want to print out the String with the highest value. I have seen other questions about sorting, but I am wondering If there is any smooth way to get the maximum value in the map?

Solution

  • Using Java 8, a one-liner for getting a key with the highest value is:

    String s = map.entrySet()
              .stream()
              .max(Map.Entry::comparingByValue)
              .map(Map.Entry::getKey)
              .orElse(null);

    s will be null if the map is empty.