Java Dictionary.keys()

public abstract Enumeration <K> keys()

import java.util.*;
/*from ww  w .  j a  v a2 s. co  m*/
public class Main {

   public static void main(String[] args) {
      Dictionary d = new Hashtable();
    
      // add some elements
      d.put("1", "from java2s.com");
      d.put("2", "Cocoa");
      d.put("5", "Coffee");
    
      // return an enumeration of the keys from this dictionary.
      for (Enumeration e = d.keys(); e.hasMoreElements();) {
         System.out.println(e.nextElement());
      }
   }
}