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Define the AdapterNode Class
</h4>
<a name="wp64253"> </a><p class="pBody">
Start by importing the tree, event, and utility classes you're going to need to make this work: 
</p>
<div class="pPreformattedRelative"><pre class="pPreformattedRelative">
// For creating a TreeModel
<code class="cCodeBold">import javax.swing.tree.*;
import javax.swing.event.*;
import java.util.*;
</code>
public class DomEcho extends JPanel
{  <a name="wp64254"> </a>
</pre></div>
<a name="wp64256"> </a><p class="pBody">
Moving back down to the end of the program, define a set of strings for the node element types: 
</p>
<div class="pPreformattedRelative"><pre class="pPreformattedRelative">
        ...
} // makeFrame<a name="wp64257"> </a>
// An array of names for DOM node-types
// (Array indexes = nodeType() values.)
<code class="cCodeBold">static final String[] typeName = {
&nbsp;&nbsp;&quot;none&quot;,
&nbsp;&nbsp;&quot;Element&quot;,
&nbsp;&nbsp;&quot;Attr&quot;,
&nbsp;&nbsp;&quot;Text&quot;,
&nbsp;&nbsp;&quot;CDATA&quot;,
&nbsp;&nbsp;&quot;EntityRef&quot;,
&nbsp;&nbsp;&quot;Entity&quot;,
&nbsp;&nbsp;&quot;ProcInstr&quot;,
&nbsp;&nbsp;&quot;Comment&quot;,
&nbsp;&nbsp;&quot;Document&quot;,
&nbsp;&nbsp;&quot;DocType&quot;,
&nbsp;&nbsp;&quot;DocFragment&quot;,
&nbsp;&nbsp;&quot;Notation&quot;,
};</code><a name="wp64258"> </a>
</pre></div>
<a name="wp64259"> </a><p class="pBody">
} // DomEcho
</p>
<a name="wp64260"> </a><p class="pBody">
These are the strings that will be displayed in the <code class="cCode">JTree</code>. The specification of these nodes types can be found in the Document Object Model (DOM) Level 2 Core Specification at <code class="cCode">http://www.w3.org/TR/2000/REC-DOM/Level-2-Core-20001113</code>, under the specification for Node. That table is reproduced below, with the headings modified for clarity, and with the <code class="cCode">nodeType</code>() column added: 
</p>
<a name="wp64405"> </a><p class="pBody">
</p><div align="left">
<table border="1" summary="Node Types " id="wp80083">
  <caption><a name="wp80083"> </a><div class="pTableTitle">
Table 6-1   Node Types&nbsp;
</div>
</caption>
  <tr align="center">    <th><a name="wp80234"> </a><div class="pCellHeading">
Node
</div>
</th>
    <th><a name="wp80236"> </a><div class="pCellHeading">
nodeName()
</div>
</th>
    <th><a name="wp80238"> </a><div class="pCellHeading">
nodeValue()
</div>
</th>
    <th><a name="wp80240"> </a><div class="pCellHeading">
attributes
</div>
</th>
    <th><a name="wp80242"> </a><div class="pCellHeading">
nodeType()
</div>
</th>
</tr>
  <tr align="left">    <td><a name="wp80103"> </a><div class="pCellBody">
 Attr
</div>
</td>
    <td><a name="wp80105"> </a><div class="pCellBody">
name of attribute
</div>
</td>
    <td><a name="wp80107"> </a><div class="pCellBody">
value of attribute
</div>
</td>
    <td><a name="wp80109"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80111"> </a><div class="pCellBody">
 2
</div>
</td>
</tr>
  <tr align="left">    <td><a name="wp80113"> </a><div class="pCellBody">
 CDATASection
</div>
</td>
    <td><a name="wp80115"> </a><div class="pCellBody">
#cdata-section
</div>
</td>
    <td><a name="wp80117"> </a><div class="pCellBody">
content of <br />the CDATA<br />section
</div>
</td>
    <td><a name="wp80119"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80121"> </a><div class="pCellBody">
 4
</div>
</td>
</tr>
  <tr align="left">    <td><a name="wp80123"> </a><div class="pCellBody">
 Comment
</div>
</td>
    <td><a name="wp80125"> </a><div class="pCellBody">
#comment
</div>
</td>
    <td><a name="wp80127"> </a><div class="pCellBody">
content of the comment
</div>
</td>
    <td><a name="wp80129"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80131"> </a><div class="pCellBody">
 8
</div>
</td>
</tr>
  <tr align="left">    <td><a name="wp80133"> </a><div class="pCellBody">
 Document
</div>
</td>
    <td><a name="wp80135"> </a><div class="pCellBody">
#document
</div>
</td>
    <td><a name="wp80137"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80139"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80141"> </a><div class="pCellBody">
 9
</div>
</td>
</tr>
  <tr align="left">    <td><a name="wp80143"> </a><div class="pCellBody">
 DocumentFragment
</div>
</td>
    <td><a name="wp80145"> </a><div class="pCellBody">
#document-fragment
</div>
</td>
    <td><a name="wp80147"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80149"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80151"> </a><div class="pCellBody">
 11
</div>
</td>
</tr>
  <tr align="left">    <td><a name="wp80153"> </a><div class="pCellBody">
 DocumentType
</div>
</td>
    <td><a name="wp80155"> </a><div class="pCellBody">
document type name
</div>
</td>
    <td><a name="wp80157"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80159"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80161"> </a><div class="pCellBody">
 10
</div>
</td>
</tr>
  <tr align="left">    <td><a name="wp80163"> </a><div class="pCellBody">
 Element
</div>
</td>
    <td><a name="wp80165"> </a><div class="pCellBody">
tag name
</div>
</td>
    <td><a name="wp80167"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80169"> </a><div class="pCellBody">
NamedNodeMap
</div>
</td>
    <td><a name="wp80171"> </a><div class="pCellBody">
 1
</div>
</td>
</tr>
  <tr align="left">    <td><a name="wp80173"> </a><div class="pCellBody">
 Entity
</div>
</td>
    <td><a name="wp80175"> </a><div class="pCellBody">
entity name
</div>
</td>
    <td><a name="wp80177"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80179"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80181"> </a><div class="pCellBody">
 6
</div>
</td>
</tr>
  <tr align="left">    <td><a name="wp80183"> </a><div class="pCellBody">
 EntityReference
</div>
</td>
    <td><a name="wp80185"> </a><div class="pCellBody">
name of entity referenced
</div>
</td>
    <td><a name="wp80187"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80189"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80191"> </a><div class="pCellBody">
 5
</div>
</td>
</tr>
  <tr align="left">    <td><a name="wp80193"> </a><div class="pCellBody">
 Notation
</div>
</td>
    <td><a name="wp80195"> </a><div class="pCellBody">
notation name
</div>
</td>
    <td><a name="wp80197"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80199"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80201"> </a><div class="pCellBody">
 12
</div>
</td>
</tr>
  <tr align="left">    <td><a name="wp80203"> </a><div class="pCellBody">
 ProcessingInstruction
</div>
</td>
    <td><a name="wp80205"> </a><div class="pCellBody">
target
</div>
</td>
    <td><a name="wp80207"> </a><div class="pCellBody">
entire content<br />excluding the<br />target
</div>
</td>
    <td><a name="wp80209"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80211"> </a><div class="pCellBody">
 7
</div>
</td>
</tr>
  <tr align="left">    <td><a name="wp80213"> </a><div class="pCellBody">
 Text
</div>
</td>
    <td><a name="wp80215"> </a><div class="pCellBody">
#text
</div>
</td>
    <td><a name="wp80217"> </a><div class="pCellBody">
content of the text node
</div>
</td>
    <td><a name="wp80219"> </a><div class="pCellBody">
null
</div>
</td>
    <td><a name="wp80221"> </a><div class="pCellBody">
 3
</div>
</td>
</tr>
</table>
</div>
<p class="pBody">
</p>
<a name="wp64406"> </a><p class="pDefinitionTerm">
Suggestion:
</p>
<a name="wp64407"> </a><p class="pDefinition">
Print this table and keep it handy. You need it when working with the DOM, because all of these types are intermixed in a DOM tree. So your code is forever asking, &quot;Is this the kind of node I'm interested in?&quot;. 
</p>
<a name="wp64408"> </a><p class="pBody">
Next, define the <code class="cCode">AdapterNode</code> wrapper for DOM nodes as an inner class:    
</p>
<div class="pPreformattedRelative"><pre class="pPreformattedRelative">
static final String[] typeName = {
&nbsp;&nbsp;...
};