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创建 JTree 模型的常用方法是创建 DefaultMutableTreeNode 的实例，然后将它们添加到一起以建立它们的层次结构关系：<pre><code style="font-family: Courier New, Courier, monospace; font-size: 12">
<span class="type">DefaultMutableTreeNode</span> <span class="variable-name">numbers</span> = <span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"Numbers"</span>);
<span class="type">DefaultMutableTreeNode</span> <span class="variable-name">odds</span>    = <span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"Odds"</span>);
<span class="type">DefaultMutableTreeNode</span> <span class="variable-name">evens</span>   = <span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"Evens"</span>);
<span class="type">DefaultMutableTreeNode</span> <span class="variable-name">primes</span>  = <span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"Primes"</span>);

<span class="variable-name">numbers</span>.<span class="function-name">add</span>(<span class="variable-name">odds</span>);
<span class="variable-name">numbers</span>.<span class="function-name">add</span>(<span class="variable-name">evens</span>);
<span class="variable-name">numbers</span>.<span class="function-name">add</span>(<span class="variable-name">primes</span>);

<span class="variable-name">odds</span>.<span class="function-name">add</span>(<span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"One"</span>));
<span class="variable-name">odds</span>.<span class="function-name">add</span>(<span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"Three"</span>));
<span class="variable-name">odds</span>.<span class="function-name">add</span>(<span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"Five"</span>));

<span class="variable-name">evens</span>.<span class="function-name">add</span>(<span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"Two"</span>));
<span class="variable-name">evens</span>.<span class="function-name">add</span>(<span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"Four"</span>));
<span class="variable-name">evens</span>.<span class="function-name">add</span>(<span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"Six"</span>));

<span class="variable-name">primes</span>.<span class="function-name">add</span>(<span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"Two"</span>));
<span class="variable-name">primes</span>.<span class="function-name">add</span>(<span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"Three"</span>));
<span class="variable-name">primes</span>.<span class="function-name">add</span>(<span class="keyword">new</span> <span class="type">DefaultMutableTreeNode</span>(<span class="constant">"Five"</span>));

<span class="type">JTree</span> <span class="variable-name">jTree</span> = <span class="keyword">new</span> <span class="type">JTree</span>(<span class="variable-name">numbers</span>);
            </code></pre>
            <script>
document.writeln('<a href=""')
document.writeln('  onMouseOver="document.images[\'TreeExpand\'].src=\'images/TreeExpandA.gif\'"')
document.writeln('  onMouseOut="document.images[\'TreeExpand\'].src=\'images/TreeExpand.gif\'">')
document.writeln('  <img src="images/TreeExpand.gif" alt="Default Swing tree"')
document.writeln('          name="TreeExpand" border="0">')
document.writeln('  </img>')
document.writeln('</a>')
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            <br x="7">             图 2.5. 树模型填充（将鼠标置于图上以产生动画效果）</p><p>
图 2.5 中的 JTree 由以上代码创建，此外还使用了缺省 Metal Look &amp; Feel。代码创建了根节点 <b>numbers</b>，并添加了三个子节点 <b>odds</b>、<b>evens</b>、<b>primes</b>。然后将前三个奇数、偶数和质数分别添加到每个子节点中。最后代码使用根节点构造 JTree。JTree 根据所提供的根节点在内部创建
TreeModel，并将自身作为 TreeModel 的 TreeModelListener 进行添加，这样它的显示就与 TreeModel 或相关 TreeNodes 的任何更改保持同步。</p><p>
所有节点都使用 String 作为它们的用户对象。每个节点右边显示的文本都由该用户对象派生而得。请注意，虽然有两个节点带有字符串 <code style="font-family: Courier
New, Courier, monospace; font-size: 12">"Two"</code>，两个节点带有字符串 <code style="font-family: Courier New, Courier,
monospace; font-size: 12">"Three"</code>，但它们是截然不同的节点实例，因为一个节点不能有多个父节点。
          </p><p>
请注意，表示数字的节点与表示数字组的节点使用不同的图标。JTree 使用 <code style="font-family: Courier
New, Courier, monospace; font-size: 12">TreeNode.isLeaf()</code>
方法来确定图标的选择，而且当节点没有子节点时，DefaultMutableTreeNode 的实现将返回 true。这也许并不是最常用的方法。考虑以下文件系统的树型视图；最常见的是目录和文件之间的差别，其中<i>可以包含</i>子代比<i>有</i>子代更重要。通过使用缺省 Swing 表示法，可以用显示文件的方法来显示空目录。要改变这个行为，需要扩展 DefaultMutableTreeNode 并覆盖此行为，或者提供 TreeNode 的替代实现。          </p><p>

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