我有个目录树，里面有3层节点，我现在能实现这三层是不同的图标，但不知怎么样让在同一层下（第三层）的图标可设置不同，老区分各节点代表的含义。   

import  java.awt.*;  
import  javax.swing.*;  
import  javax.swing.tree.*;  
 
public  class  MenuTree  
{  
       protected  static  final  int  filiale1=  CONSTANT  +  1;  
       protected  static  final  int  filiale2=  CONSTANT  +  2;  
       public  MenuTree()  
       {  
       }  
 
       /**  
         *  Description  :构造面版节点树  
         *  @param  dept部门名  
         *  @param  
         *  @return    tree  
         */  
 
       public  static  JTree  MenuTree(int  dept)  
       {  
               DefaultMutableTreeNode  group  =  new  DefaultMutableTreeNode("集团");  
               JTree  tree  =  new  JTree(group);  
               if  (dept=="filiale1")  
               {  
                       DefaultMutableTreeNode  company=  new  DefaultMutableTreeNode("分公司");  
                       group.add(manager);  
 
                       DefaultMutableTreeNode  manager=  new  DefaultMutableTreeNode("总经理");  
                       company.add(manager);  
 
                       DefaultMutableTreeNode  cfo=  new  DefaultMutableTreeNode("财务部长");  
                       company.add(cfo);  
 
                       DefaultMutableTreeNode  personnel1=  new  DefaultMutableTreeNode("职员");  
                       company.add(personnel1);  
 
                       DefaultMutableTreeNode  personnel2=  new  DefaultMutableTreeNode("职员");  
                       company.add(personnel2);  
 
                       DefaultMutableTreeNode  personnel3=  new  DefaultMutableTreeNode("职员");  
                       company.add(personnel3);  
               }  
 
               tree.setCellRenderer(new  TreeRenderer());  
               //tree.setToggleClickCount(10);  
               tree.addSelectionInterval(1,  10);  
               tree.setVisibleRowCount(10);  
 
               tree.setFont(new  Font("SansSerif",  Font.PLAIN,  12));  
 
               for  (int  i  =  0;  i  <  tree.getRowCount();  i++)  
               {  
                       tree.expandRow(i);  
               }  
 
               return  tree;  
       }  
 
       /**  
         *  创建节点的图标志  
         *  〈功能详细描述〉  
         *  @param  path  图标路径  
         *  @return  图标对象  
         *  @exception/throws  N/A  
         */  
       private  static  ImageIcon  createImageIcon(String  path)  
       {  
               java.net.URL  imgURL  =  imagepath.class.getResource(path);  
               if  (imgURL  !=  null)  
               {  
                       //System.out.println("url=="  +  imgURL);  
                       return  new  ImageIcon(imgURL);  
               }  
               else  
               {  
                       System.err.println("Couldn't  find  file:  "  +  path);  
                       return  null;  
               }  
       }  
 
       //Tree  render  
       private  static  class  TreeRenderer  
               extends  DefaultTreeCellRenderer  
       {  
               ImageIcon  foldercIcon  =  createImageIcon("images/folderc.jpg");  
               ImageIcon  folderoIcon  =  createImageIcon("images/foldero.jpg");  
               ImageIcon  treeIcon  =  createImageIcon("images/tree.jpg");  
               ImageIcon  managerIcon  =  createImageIcon("images/manager.jpg");  
               ImageIcon  personnelIcon  =  createImageIcon("images/personnel.jpg");  
               ImageIcon  cfoIcon  =  createImageIcon("images/cfo.jpg");  
 
               public  TreeRenderer()  
               {  
                       if  (foldercIcon  !=  null  &&  folderoIcon  !=  null)  
                       {  
                               setIcon(treeIcon);  
                               setClosedIcon(foldercIcon);  
                               setOpenIcon(folderoIcon);  
                       }  
               }  
 
               public  Component  getTreeCellRendererComponent(JTree  tree,  Object  value,  
                       boolean  sel,  boolean  expanded,  
                       boolean  leaf,  int  row,  
                       boolean  hasFocus)  
               {  
                       super.getTreeCellRendererComponent(tree,  value,  sel,  expanded,  leaf,  
                                                                                             row,  
                                                                                             hasFocus);  
                       setText(value.toString());  
                       DefaultMutableTreeNode  node  =  (DefaultMutableTreeNode)  value;  
                       String  str  =  value.toString();  
                       if  (str.equals("总经理"))  
                       {  
                               setLeafIcon(managerIcon  );  
                       }  
                       else  if  (str.equals("财务部长"))  
                       {  
                               setLeafIcon(cfoIcon  );  
                       }  
                       else    
                       {  
                               setLeafIcon(personnelIcon);  
                       }  
                       return  this;  
               }  
       }  
}  
查了下，大概应该是这么写，但是运行结果有问题，鼠标点节点的时候老是乱变，不知为什么，哪个高手指教一下，感激不尽！！！