Java Collection Tutorial - Java TreeMap.comparator()


TreeMap.comparator() has the following syntax.

public Comparator <? super K> comparator()


In the following code shows how to use TreeMap.comparator() method.

import java.util.Comparator;
import java.util.NavigableMap;
import java.util.TreeMap;
/*from ww  w.j  a  v  a  2s  .  c  o  m*/
public class Main {
   public static void main(String[] args) {
      NavigableMap<Integer, String>  treemap = new TreeMap<Integer, String> ();
      // populating tree map
      treemap.put(2, "two");
      treemap.put(1, "one");
      treemap.put(3, "three");
      treemap.put(6, "six");
      treemap.put(5, "from");
      // using comparator
      Comparator comp = treemap.comparator();
      System.out.println("Following natural ordering");
      System.out.println("Comparator value: "+ comp);     

The code above generates the following result.