import java.util.*;
    
    public class PollsNMDemo{
        public static void main(String args[]) {
    
          //create a SortedMap -> tree structure    
          SortedMap SM=new TreeMap();                                       
            
          //create a NavigableMap
          NavigableMap NM=(NavigableMap)(SM);

          //populate the NM            
          NM.put(8.09,"Hydro");
          NM.put(7.25,"George");
          NM.put(9.00,"Any");
          NM.put(10.00,"Martin");
          NM.put(5.64,"Wallace");            

          Double test=new Double(9.0);
          
          //firstEntry
          System.out.println("----------------------------------------");                    
          Map.Entry<Double,String> first_entry=NM.firstEntry();            
          System.out.println("first_entry:{"+first_entry.getKey()+","+first_entry.getValue()+"}");
          System.out.println("----------------------------------------");          
          
          //lastEntry
          System.out.println("----------------------------------------");                    
          Map.Entry<Double,String> last_entry=NM.lastEntry();            
          System.out.println("last_entry:{"+last_entry.getKey()+","+last_entry.getValue()+"}");
          System.out.println("----------------------------------------");        
          
          //pollFirstEntry
          System.out.println("----------------------------------------");                    
          Map.Entry<Double,String> poll_first_entry=NM.pollFirstEntry();            
          System.out.println("pool_first_entry:{"+poll_first_entry.getKey()+","
                   +poll_first_entry.getValue()+"}");
          System.out.println("----------------------------------------");        

          //firstEntry - this method will return now the entry: {7.25,George}
          
          //pollLastEntry
          System.out.println("----------------------------------------");                    
          Map.Entry<Double,String> poll_last_entry=NM.pollLastEntry();            
          System.out.println("pool_last_entry:{"+poll_last_entry.getKey()+",
                        "+poll_last_entry.getValue()+"}");
          System.out.println("----------------------------------------");        
          
          //lastEntry - this method will return now the entry: {9.0,Any}
          }
    }

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