谁有JTree的完整例子啊，最好有填加删除结点的功能！！


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;public class TreeDemo6 implements ActionListener,TreeModelListener{
  JLabel label=null;
  JTree  tree=null;
  DefaultTreeModel treeModel=null;
  String nodeName=null;//原有节点名称
  
  public TreeDemo6(){ JFrame f=new JFrame("TreeDemo6");
Container contentPane=f.getContentPane();
    
DefaultMutableTreeNode root=new DefaultMutableTreeNode("资源管理器");
    
tree=new JTree(root);
tree.setEditable(true);
tree.addMouseListener(new MouseHandle());
treeModel=(DefaultTreeModel)tree.getModel();
treeModel.addTreeModelListener(this);
    
JScrollPane scrollPane=new JScrollPane();
scrollPane.setViewportView(tree);
    
JPanel panel=new JPanel();
JButton b=new JButton("新增节点");
b.addActionListener(this);
panel.add(b);
b=new JButton("删除节点");
b.addActionListener(this);
panel.add(b);
b=new JButton("清除所有节点");
b.addActionListener(this);
panel.add(b);
    
label=new JLabel("Action");
contentPane.add(panel,BorderLayout.NORTH);
contentPane.add(scrollPane,BorderLayout.CENTER);
contentPane.add(label,BorderLayout.SOUTH);
f.pack();
f.setVisible(true);
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
  System.exit(0);
}
});
  }
  //本方法运行新增、删除、清除所有节点的程序代码.
  public void actionPerformed(ActionEvent ae){
 if (ae.getActionCommand().equals("新增节点")){
 DefaultMutableTreeNode parentNode=null;
 DefaultMutableTreeNode newNode=new DefaultMutableTreeNode("新节点");
 newNode.setAllowsChildren(true);
 TreePath parentPath=tree.getSelectionPath();
          
 //取得新节点的父节点
 parentNode=(DefaultMutableTreeNode)(parentPath.getLastPathComponent());  //由DefaultTreeModel的insertNodeInto（）方法增加新节点
 treeModel.insertNodeInto(newNode,parentNode,parentNode.getChildCount());  //tree的scrollPathToVisible()方法在使Tree会自动展开文件夹以便显示所加入的新节点。若没加这行则加入的新节点
 //会被 包在文件夹中，你必须自行展开文件夹才看得到。
 tree.scrollPathToVisible(new TreePath(newNode.getPath()));      
 label.setText("新增节点成功");
 }
 if (ae.getActionCommand().equals("删除节点")){
TreePath treepath=tree.getSelectionPath();
if (treepath!=null){
  //下面两行取得选取节点的父节点.
  DefaultMutableTreeNode selectionNode=(DefaultMutableTreeNode)treepath.getLastPathComponent();
  TreeNode parent=(TreeNode)selectionNode.getParent();
  if (parent!=null) {
 //由DefaultTreeModel的removeNodeFromParent()方法删除节点，包含它的子节点。
 treeModel.removeNodeFromParent(selectionNode);
 label.setText("删除节点成功");
  }
}    
 }
 if (ae.getActionCommand().equals("清除所有节点")){ //下面一行，由DefaultTreeModel的getRoot()方法取得根节点.
DefaultMutableTreeNode rootNode=(DefaultMutableTreeNode)treeModel.getRoot();
 
//下面一行删除所有子节点.
rootNode.removeAllChildren();   
 
//删除完后务必运行DefaultTreeModel的reload()操作，整个Tree的节点才会真正被删除.     
treeModel.reload();
label.setText("清除所有节点成功");
 }
  }
 public void treeNodesChanged(TreeModelEvent e){
   TreePath treePath=e.getTreePath();
   DefaultMutableTreeNode node=(DefaultMutableTreeNode)treePath.getLastPathComponent();
   try{
 int[] index=e.getChildIndices();
 node=(DefaultMutableTreeNode)node.getChildAt(index[0]);
   }catch(NullPointerException exc){}
 label.setText(nodeName+"更改数据为:"+(String)node.getUserObject());
 }
 public void treeNodesInserted(TreeModelEvent e){
   System.out.println("new node insered");      
 }
 public void treeNodesRemoved(TreeModelEvent e){
   System.out.println("node deleted");
 }
 public void treeStructureChanged(TreeModelEvent e){
   System.out.println("Structrue changed");
 }
public static void main(String[] args){
  new TreeDemo6();
}
    
class MouseHandle extends MouseAdapter{
  public void mousePressed(MouseEvent e){
 try{
   JTree tree=(JTree)e.getSource();
   int rowLocation=tree.getRowForLocation(e.getX(),e.getY());
   TreePath treepath=tree.getPathForRow(rowLocation);
   TreeNode treenode=(TreeNode)treepath.getLastPathComponent();
   nodeName=treenode.toString();           
 }catch(NullPointerException ne){}
  }
}
}