import java.util.*;
    
    public class IteratorsDemo {
    
        public static void seeElementsAscending(NavigableSet NS)
            {
            //see the elements ascending  
            System.out.println("---Ascending:---");              
            Iterator i=NS.iterator();
            while(i.hasNext()){
                System.out.println(i.next());
            }           
           }       

        public static void seeElementsDescending(NavigableSet NS)
            {
            //see the elements descending  
            System.out.println("---Descending:---");              
            Iterator i=NS.descendingIterator();
            while(i.hasNext()){
                System.out.println(i.next());
            }           
           }       
        
        public static void main(String args[]) {
    
            //create a SortedSet -> tree structure    
            SortedSet SS=new TreeSet();                                       
            
            //create a NavigableSet
            NavigableSet NS=(NavigableSet)(SS);

            //populate the NS            
            NS.add("Hydro");
            NS.add("George");
            NS.add("Any");
            NS.add("Martin");
            NS.add("Wallace");

            seeElementsAscending(NS);
            System.out.println("----------------------------------------");        

            seeElementsDescending(NS);
            System.out.println("----------------------------------------");     
            }
    }

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