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<DIV class=dayheader>2004年 11月23日 </DIV>
<DIV class=postheader><A name=315937></A>16 : 54 向Jtree中插入节点的例子 </DIV>
<P>
<P>java中向Jtree中插入节点的例子.</P>
<P>去年用JAVA做图形化时的一个例子,思路不错!</P><FONT color=#333333>import
javax.swing.*;<BR>import javax.swing.event.*;<BR>import
javax.swing.tree.*;<BR>import java.awt.*;<BR>import java.awt.event.*;
</FONT>
<P>public class Test extends JFrame {<BR>JTree tree = new
JTree();<BR>DefaultTreeModel model =
(DefaultTreeModel)tree.getModel();<BR>TreeSelectionModel selectionModel =
tree.getSelectionModel(); </P>
<P>JButton removeButton = new JButton("Remove selected node");<BR>JButton
addButton = new JButton("Add node"); </P>
<P>public Test() {<BR>Container contentPane = getContentPane(); </P>
<P>selectionModel.setSelectionMode(<BR>TreeSelectionModel.SINGLE_TREE_SELECTION);
</P>
<P>contentPane.add(new ControlPanel(),
BorderLayout.NORTH);<BR>contentPane.add(tree, BorderLayout.CENTER); </P>
<P>tree.addTreeSelectionListener(<BR>new TreeSelectionListener()
{<BR>public void valueChanged(TreeSelectionEvent e) {<BR>TreePath path =
e.getNewLeadSelectionPath();<BR>boolean nodesAreSelected = (path != null);
</P>
<P>addButton.setEnabled(nodesAreSelected);<BR>removeButton.setEnabled(nodesAreSelected);<BR>}<BR>});<BR>model.addTreeModelListener(new
TreeModelListener() {<BR>public void treeNodesInserted(TreeModelEvent e)
{<BR>showInsertionOrRemoval(e, " added to ");<BR>}<BR>public void
treeNodesRemoved(TreeModelEvent e) {<BR>showInsertionOrRemoval(e, "
removed from ");<BR>}<BR>private void
showInsertionOrRemoval(TreeModelEvent e,<BR>String s) {<BR>Object[]
parentPath = e.getPath();<BR>int[] indexes =
e.getChildIndices();<BR>Object[] children = e.getChildren();<BR>Object
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