Listing 2: sorted_map.java
import java.util.*;
    
    public class sorted_map{    
    
      public static void seeEntries(SortedMap SM,String info)
            {
            //see the entries
            System.out.println(info);              
            Iterator i=SM.keySet().iterator();
            while(i.hasNext()){
                Double key=(Double)i.next(); 
                            System.out.println("Name:"+SM.get(key)+"\tNote:"+key); 
            }           
           }       
    
        public static void main(String args[]) {
    
            //create a SortedMap -> tree structure    
            SortedMap SM=new TreeMap();                                       
            
            //populate the SM            
            SM.put(8.09,"Hydro");
            SM.put(7.25,"George");
            SM.put(9.00,"Any");
            SM.put(10.00,"Martin");
            SM.put(5.64,"Wallace");            

            seeEntries(SM,"SortedMap:"); 
            }
    }

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