Listing 10: LHCF_entry_Demo.java
import java.util.*;
    
    public class LHCF_entry_Demo{
    
            
        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);
          
            //lower_entry  
            Map.Entry<Double,String> lower_entry=NM.lowerEntry(test); 
            System.out.println("->[Lower_entry "+test+"] - 
                   {"+lower_entry.getKey()+","+lower_entry.getValue()+"} !");
            System.out.println("----------------------------------------");        

            //higher_entry  
            Map.Entry<Double,String> higher_entry=NM.higherEntry(test); 
            System.out.println("->[Higher_entry "+test+"] - 
                   {"+higher_entry.getKey()+","+higher_entry.getValue()+"} !");
            System.out.println("----------------------------------------");        

            //ceiling_entry  
            Map.Entry<Double,String> ceiling_entry=NM.ceilingEntry(test); 
            System.out.println("->[Ceiling_entry "+test+"] - 
                   {"+ceiling_entry.getKey()+","+ceiling_entry.getValue()+"} !");
            System.out.println("----------------------------------------");        

            //floor_entry  
            Map.Entry<Double,String> floor_entry=NM.floorEntry(test); 
            System.out.println("->[Floor_entry "+test+"] - 
                   {"+floor_entry.getKey()+","+floor_entry.getValue()+"} !");
            System.out.println("----------------------------------------"); 
            }
    }

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