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href="/developerWorks/education/java/">教学 - 在线课程</a></font><br x="7"><img src="imagemaster/masthead.jpg" alt="构建定制的树型视图"></td><td width="*" valign="bottom" align="right"><a border="0" href="../MagnitudeTree.zip"><img alt="下载教程 zip 文件" border="0" src="../i/icon-zip.gif"></a><a href=../MagnitudeTree_eng/index.html target=_blank><img alt="英文原文" border="0" src="../i/icon-source.gif"></a></td></tr><tr><td height="2" colspan="2"><img height="2" width="1" src="../i/c.gif"></td></tr></table><TABLE border="0" cellpadding="0" cellspacing="0" width="100%"><TR><TD width="150" height="1" bgcolor="#000000" colspan="6"><IMG alt="" height="1" width="150" src="../i/c.gif"></TD></TR><TR><TD background="../i/sw-gold.gif"><a border="0" href="index.html" onMouseOver="iOver('topmain'); iOver('bottommain'); self.status=mainblurb; return true;" onMouseOut="iOut('topmain'); iOut('bottommain'); self.status=''; return true;"><img alt="主菜单" border="0" src="../i/main.gif" name="topmain"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topsection'); iOver('bottomsection'); self.status=sectionblurb; return true;" onMouseOut="iOut('topsection'); iOut('bottomsection'); self.status=''; return true;" href="index3.html"><img alt="章节菜单" border="0" src="../i/section.gif" name="topsection"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topfeedback'); iOver('bottomfeedback'); self.status=feedbackblurb; return true;" onMouseOut="iOut('topfeedback'); iOut('bottomfeedback'); self.status=''; return true;" href="MagnitudeTree-7-4.html"><img alt="提交反馈意见" border="0" src="../i/feedback.gif" name="topfeedback"></a></TD><TD width="100%" background="../i/sw-gold.gif"><img src="../i/c.gif"></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topprevious'); iOver('bottomprevious'); self.status=previousblurb; return true;" onMouseOut="iOut('topprevious'); iOut('bottomprevious'); self.status=''; return true;" href="MagnitudeTree-3-3.html"><img alt="上一屏" border="0" src="../i/previous.gif" name="topprevious"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topnext'); iOver('bottomnext'); self.status=nextblurb; return true;" onMouseOut="iOut('topnext'); iOut('bottomnext'); self.status=''; return true;" href="MagnitudeTree-3-5.html"><img alt="下一屏" border="0" src="../i/next.gif" name="topnext"></a></TD></TR></TABLE><table bgcolor="ffffff" cellspacing="0" cellpadding="2" border="0" height="400" width="100%"><tr valign="bottom"><a name="navskip"></a><td height="25" colspan="4"><img border="0" height="25" width="562" src="imagemaster/titlebar3.jpg" alt="3. 定制模型"></td></tr><tr><td bgcolor="ffffff" width="15">&nbsp;</td><td bgcolor="ffffff" width="12">&nbsp;</td><td valign="top" align="left" bgcolor="ffffff" width="*"><p><br x="7"><table cellspacing="0" cellpadding="0" border="0"><tr><td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>树节点的接口</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>    第 4 页（共 9 页）</nobr></font></td></tr></table><br x="7"><br x="7"></p><font size="2" face="Verdana, Arial, Helvetica"><p>
TreeNode 接口为树节点定义了方法，然后 DefaultTreeModel 就可以使用这些节点。它包括了用于为每个节点建立父节点和子节点（如果有的话）的方法，但没有包括用于添加或除去子节点的方法。在扩展 TreeNode 接口的 MutableTreeNode 接口中引入了这些方法。
          </p><p>
请注意，TreeNode 接口以及 MutableTreeNode 接口允许查询节点的三个不同但又相关方面的信息：<ul><li>
                如果该节点可以有子节点（不论当前是否有子节点），那么 <code style="font-family: Courier New, Courier, monospace; font-size:
12">getAllowsChildren()</code> 返回 <code style="font-family: Courier
New, Courier, monospace; font-size: 12">true</code>。
              </li><li>
                <code style="font-family: Courier New, Courier, monospace; font-size:
12">getChildCount()</code> 返回该节点当前所拥有的子节点数量。
              </li><li>
                如果认为该节点是“叶”节点，那么 <code style="font-family: Courier New, Courier, monospace; font-size:
12">isLeaf()</code> 就返回 <code style="font-family: Courier New,
Courier, monospace; font-size: 12">true</code>。这个方法可用于选择替代绘制，而且在以后的页面中详细讨论。
              </li></ul>
          </p><p>
然而，TreeNode 和 MutableTreeNode 既没有定义节点“大小”的概念，也没有定义节点及其子代的合计大小的概念。必须引入允许查询每个节点此类信息的方法，以便可以显示此类信息。现在介绍为支持本教程而创建的第一个定制组件 -- <b>MagnitudeNode</b> 接口，它扩展了 MutableTreeNode 以添加必需的方法：
</p><pre><code style="font-family: Courier New, Courier, monospace; font-size: 12">
<span class="keyword">public</span> <span class="keyword">interface</span> <span class="type">MagnitudeNode</span>
       <span class="keyword">extends</span>   <span class="type">javax.swing.tree.MutableTreeNode</span>
{
  <span class="comment">/** Return the size of the node excluding the size of any children.
    * @return long the size of the node. */</span>
  <span class="keyword">public</span> <span class="type">long</span> <span class="function-name">getSize</span>();

  <span class="comment">/** Return the total size of this node and all of its descendants.
    * @return long the total size of the node and all descendants. */</span>
  <span class="keyword">public</span> <span class="type">long</span> <span class="function-name">getAggregateSize</span>();

  <span class="comment">/** Return the total number of leaf descendants of this node.
    * @return long the total number of leaf descendants. */</span>
  <span class="keyword">public</span> <span class="type">int</span> <span class="function-name">getLeafCount</span>();

  <span class="comment">/** Return true if the node's aggregated size and count have been
    * calculated, otherwise return false. */</span>
  <span class="keyword">public</span> <span class="type">boolean</span> <span class="function-name">isAggregated</span>();

  <span class="comment">/** Return the root node of the hierarchy containing this node.
    * @return TreeNode the root node of the hierarchy. */</span>
  <span class="keyword">public</span> <span class="type">TreeNode</span> <span class="function-name">getRoot</span>();
}
          </code></pre><p>
这个接口不假设如何真正获取大小信息（使用 <code style="font-family:
Courier New, Courier, monospace; font-size: 12">getSize()</code>
方法）；例如，如果文件系统中的节点表示文件，则大小可能是由 <code style="font-family: Courier New, Courier,
monospace; font-size: 12">File.length()</code> 方法获取的文件大小，而其它对象的层次结构可能使用另一种完全不同的机制来报告大小。
          </p><p>
请注意，该接口还不假设如何计算或存储合计大小。但是，该接口的实现可能并不烦琐，而计算合计大小可能是一项费时的任务。因此，将包括 <code style="font-family: Courier New, Courier,
monospace; font-size: 12">isAggregated()</code> 方法以报告是否已计算了合计大小。
          </p><p>
将以某种方法构建该接口的 DefaultMagnitudeNode 实现，以使它仍然可以普遍适用于任何层次结构。本章的其余部分将说明这一点。
          </p><br x="7"></font></td></tr></table><TABLE border="0" cellpadding="0" cellspacing="0" width="100%"><TR><TD background="../i/sw-gold.gif"><a border="0" href="index.html" onMouseOver="iOver('topmain'); iOver('bottommain'); self.status=mainblurb; return true;" onMouseOut="iOut('topmain'); iOut('bottommain'); self.status=''; return true;"><img alt="主菜单" border="0" src="../i/main.gif" name="bottommain"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topsection'); iOver('bottomsection'); self.status=sectionblurb; return true;" onMouseOut="iOut('topsection'); iOut('bottomsection'); self.status=''; return true;" href="index3.html"><img alt="章节菜单" border="0" src="../i/section.gif" name="bottomsection"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topfeedback'); iOver('bottomfeedback'); self.status=feedbackblurb; return true;" onMouseOut="iOut('topfeedback'); iOut('bottomfeedback'); self.status=''; return true;" href="MagnitudeTree-7-4.html"><img alt="提交反馈意见" border="0" src="../i/feedback.gif" name="bottomfeedback"></a></TD><TD width="100%" background="../i/sw-gold.gif"><img src="../i/c.gif"></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topprevious'); iOver('bottomprevious'); self.status=previousblurb; return true;" onMouseOut="iOut('topprevious'); iOut('bottomprevious'); self.status=''; return true;" href="MagnitudeTree-3-3.html"><img alt="上一屏" border="0" src="../i/previous.gif" name="bottomprevious"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topnext'); iOver('bottomnext'); self.status=nextblurb; return true;" onMouseOut="iOut('topnext'); iOut('bottomnext'); self.status=''; return true;" href="MagnitudeTree-3-5.html"><img alt="下一屏" border="0" src="../i/next.gif" name="bottomnext"></a></TD></TR><TR><TD width="150" height="1" bgcolor="#000000" colspan="6"><IMG alt="" height="1" width="150" src="../i/c.gif"></TD></TR></TABLE><TABLE cellpadding="0" cellspacing="0" border="0"><TR><TD width="182"><TABLE cellpadding="0" cellspacing="0" border="0" width="182">
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