import java.util.*;
    
    public class PollsDemo {
    
        public static void seeElements(NavigableSet NS,String info)
            {
            //see the elements  
            System.out.println(info);              
            Iterator i=NS.iterator();
            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");

            String first=(String)NS.first();
            String last=(String)NS.last();               
            seeElements(NS,"Test first/last methods from SortedSet:");
            System.out.println("---The first method returns:"+first+"---");
            System.out.println("---The last method returns:"+last+"---");
            System.out.println("----------------------------------------");        
            
            String pollfirst=(String)NS.pollFirst();
            String polllast=(String)NS.pollLast();
            seeElements(NS,"Test pollFirst/pollLast methods from NavigableSet:");
            System.out.println("---The pollFirst method returns:"+pollfirst+"---");
            System.out.println("---The pollLast method returns:"+polllast+"---");
            System.out.println("----------------------------------------");     
            }
    }

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