Simple Java Hashtable Example

       public class SimpleHashtableExample
   {
     public static void main(String[] args)
     {
       //create object of Hashtable
       Hashtable ht = new Hashtable();
      
       /*
       Add key value pair to Hashtable using
       Object put(Object key, Object value) method of Java Hashtable class,
       where key and value both are objects
       and can not be null.
       put method returns Object which is either the value previously tied
       to the key or null if no value mapped to the key.
       */
      
       ht.put("One", new Integer(1));
       ht.put("Two", new Integer(2));
      
       /*
       Please note that put method accepts Objects. Java Primitive values CAN NOT
       be added directly to Hashtable. It must be converted to corrosponding
       wrapper class first.
       */
      
       //retrieve value using Object get(Object key) method of Java Hashtable class
       Object obj = ht.get("One");
       System.out.println(obj);
      
       /*
       Please note that the return type of get method is Object. The value must
       be casted to the original class.
       */
     }
   }