Hello Friend,

Neither you have called the method price() nor you have print anything.Anyways, we have modified your code:

import java.util.*;

public class BookDemo {
    static HashMap<String, Integer>hm=new HashMap<String, Integer>();
    public static void main(String[] args) {
        BookDemo bm=new BookDemo();
        bm.add(); 
        Set set = hm.entrySet();
        Iterator i = set.iterator();

    while(i.hasNext()){
      Map.Entry me = (Map.Entry)i.next();
      System.out.println(price(me.getKey().toString()));
        }
    }
        public void add() { 
            hm.put("JAVA", 350); 
            hm.put("C", 260);
            hm.put("HTML", 200); 
            hm.put("Visual Basic", 400); 
            hm.put("Microsoft office",300); 
            } 
            public  static int price(String st) { 
                return hm.get(st); 
                } 
                }

Thanks