title: Hashtable with different values for single key
body: <p>if i have multiple values for same key then how to add it in  hash table 
  for example:</p>
  
  <pre><code>                   Hashtable hs = new Hashtable();
                        hs["id"]= "x001.xhtml";
                        hs["media-type"]= "application/xhtm+xml"; 
                        hs["href"]= "text/001.xhtml";
  
                        hs["id"]= "x002.xhtml";
                        hs["media-type"]= "application/xhtm+xml";
                        hs["href"]= "text/002.xhtml";
  
                       hs["id"]= "x003.xhtml";
                       hs["media-type"]= "application/xhtm+xml";
                       hs["href"]= "text/003.xhtml";
  </code></pre>
  
  <p>this is taking only last group in hashtable i.e</p>
  
  <pre><code>                     hs["id"]= "x003.xhtml";
                       hs["media-type"]= "application/xhtm+xml";
                       hs["href"]= "text/003.xhtml";
  </code></pre>
  
  <p>how to solve this....thanks in advance!!</p>