Java tutorial
import java.util.Enumeration; import java.util.HashMap; import java.util.Hashtable; public class Main { public static void main(String[] args) { HashMap<String, String> hMap = new HashMap<String, String>(); hMap.put("1", "One"); hMap.put("2", "Two"); hMap.put("3", "Three"); Hashtable<String, String> ht = new Hashtable<String, String>(); ht.put("1", "REPLACED !!"); ht.put("4", "Four"); Enumeration e = ht.elements(); while (e.hasMoreElements()) { System.out.println(e.nextElement()); } ht.putAll(hMap); e = ht.elements(); while (e.hasMoreElements()) { System.out.println(e.nextElement()); } } }