Java tutorial
import java.util.Date; import java.util.Enumeration; import java.util.Hashtable; public class Main { public static void main(String[] args) { Hashtable h = new Hashtable(20); System.out.println(h.put("one", new Integer(1))); System.out.println(h.put("name", "A")); System.out.println(h.put("date", new Date())); System.out.println(h.put("one", new Integer(4))); Enumeration e = h.keys(); while (e.hasMoreElements()) System.out.println(e.nextElement()); e = h.elements(); while (e.hasMoreElements()) System.out.println(e.nextElement()); } }