import java.util.Enumeration; import java.util.Hashtable; public class Main { public static void main(String[] args) { Hashtable<String, String> ht = new Hashtable<String, String>(); ht.put("1", "One"); ht.put("2", "Two"); ht.put("3", "Three"); Enumeration e = ht.keys(); while (e.hasMoreElements()){ System.out.println(e.nextElement()); } } }