import java.util.*;
    
    public class LHCFDemo {     
        
        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 test="Hydro";
            
            //lower
            String lower=(String)NS.lower(test);
            System.out.println("->[Lower "+test+"] - "+lower+" !");

            //higher
            String higher=(String)NS.higher(test);
            System.out.println("->[Higher "+test+"] - "+higher+" !");
           
            //ceiling
            String ceiling=(String)NS.ceiling(test);
            System.out.println("->[Ceiling "+test+"] - "+ceiling+" !");
            
             //floor
            String floor=(String)NS.floor(test);
            System.out.println("->[Floor "+test+"] - "+floor+" !");
            }
    }

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