TreeMap descendingKeySet() method in java

import java.util.NavigableSet;
import java.util.TreeMap;
public class TreeMapDescendingKeySetMethodExample
{
   public static void main(String[] args)
   {
      TreeMap<Integer, String> tm = new TreeMap<Integer, String>();
      tm.put(63, "banana");
      tm.put(56, "watermelon");
      tm.put(35, "orange");
      tm.put(83, "apple");
      tm.put(65, "pineapple");
      // put values in NavigableSet
      NavigableSet ns = tm.descendingKeySet();
      System.out.println("TreeMap values using descendingKeySet() method: ");
      System.out.println("NavigableSet values: " + ns);
   }
}