get all element dom tree

 hi
from the following tree i need to get hold of
<lastName>, <firstName> ,<Address> ,<time>, <number> elements using  java
xml dom



<top>
        <lastName>Smith</lastName>
        <firstName>j</firstName>
        <address>10 x road</address>
        <city>oxford</city>
        <date> 1999-03-04</date>
        <time>14:00:00</time>
        <number>10</number>

    </top>

i used the following but it gives me the lastName and the firstName
elements i need to get the rest  how can i do it

thanks


NodeList nodeList = doc.getElementsByTagName("lastName");
System.out.println("node list length: " + nodeList.getLength());
   if (nodeList.getLength() != 0) {
       Node lastNameNode = null;
       Node firstNameNode = null;
       for (int i=0; i<nodeList.getLength(); i++) {
           lastNameNode = nodeList.item(i);
           System.out.println(lastNameNode.getChildNodes().item(0).getNodeValue());
           Node node =  lastNameNode.getNextSibling();
           while (node != null) {
               if ("firstName".equals(node.getNodeName())){
                  System.out.println("  " +
node.getChildNodes().item(0).getNodeValue());
               break;
               }
          node = node.getNextSibling();
        }
      }
    }
else {
      System.out.println("Not found " );
    }