Java tutorial
import java.util.Hashtable; public class Main { public static void main(String[] s) { Hashtable<String, String> table = new Hashtable<String, String>(); table.put("key1", "value1"); table.put("key2", "value2"); table.put("key3", "value3"); Hashtable<String, String> table2 = new Hashtable<String, String>(); table2.put("key4", "value4"); table2.put("key5", "value5"); table2.put("key6", "value6"); table2.putAll(table); System.out.println(table2); } }