谁能帮我解决这里添加目录时出现的ArrayIndexOutOfBoundsException？

我发现在删除一个目录后，再添加时在做
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
后selectedNode.getChildCount（）返回正确值的两倍。
所以
model.insertNodeInto(newNode,selectedNode,selectedNode.getChildCount());
就错了。
xx > xx前面就是selectedNode.getChildCount()，后面是当前model里的值。
如果你用model.insertNodeInto(newNode,selectedNode,0);就会发现错误。我还在努力调试。但我对swing的熟悉程度估计跟你一样我也只知道这些：）。
看看别的高手能不能帮你。

sorry,没有看仔细你的程序。
这是个逻辑错误。
当你删除目录后，public void valueChanged(TreeSelectionEvent event)
将被调用。又重新装入了一边目录。所以会有两倍内容的情况。
你应该先
p.removeAllChildren();
在作你的代码。

所有的code/*===============================DirBrowserTest.java=========================================*/import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import javax.swing.JOptionPane;//------------------------------------------------------------------------------------------public class DirBrowserTest
{
public static void main(String[] args)
{
JFrame frame = new DirBrowserTestFrame();
frame.show();
}
}//--------------------------------------------------------------------------------------------class DirBrowserTestFrame extends JFrame implements ActionListener,TreeSelectionListener
{
public DirBrowserTestFrame()
{
setTitle("DirBrowser");
setSize(400,300);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});root = new DefaultMutableTreeNode("root");
root.setAllowsChildren(true);
root.add(new DefaultMutableTreeNode(new File("C:\\")));
root.add(new DefaultMutableTreeNode(new File("D:\\")));
root.add(new DefaultMutableTreeNode(new File("E:\\")));
root.add(new DefaultMutableTreeNode(new File("F:\\")));
root.add(new DefaultMutableTreeNode(new File("G:\\")));model = new DefaultTreeModel(root);
tree = new JTree(model);
tree.putClientProperty("JTree.lineStyle" , "Angled");
        tree.setRootVisible(false);
        tree.setEditable(true);  //°ÑÊ÷ÉèÎª¿É±à¼//setup the selection mode
tree.addTreeSelectionListener(this);
int mode = TreeSelectionModel.SINGLE_TREE_SELECTION;
tree.getSelectionModel().setSelectionMode(mode);model.setAsksAllowsChildren(true);          //Ö»ÓÐÊÖ¶¯ÔÊÐíµÄ½Úµã¿ÉÒÔ±íÊ¾ÎªÒ³½Úµã//this text area holds the current directory
textArea = new JTextArea();JPanel panel = new JPanel();
panel.setLayout(new GridLayout(1,2));
panel.add(new JScrollPane(tree));
panel.add(new JScrollPane(textArea));AddDir = new JButton("AddDir");
Delete = new JButton("Delete");
AddDir.addActionListener(this);
Delete.addActionListener(this);
JPanel p = new JPanel();
p.setLayout(new FlowLayout());
p.add(AddDir);
p.add(Delete);
Container contentPane = getContentPane();
contentPane.add(panel,"Center");
contentPane.add(p,"South");
}//--------------------------------------------------------------------------------------------public void actionPerformed(ActionEvent event)
{
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
if(selectedNode == null)return;
// DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode)selectedNode.getParent();
Object source = event.getSource();
if(source == AddDir)
{
if(!selectedNode.getAllowsChildren())return;
NewDirInfo n = new NewDirInfo("newdir");
if(newDialog == null)newDialog = new NewDirDialog(this);
if(newDialog.showDialog(n))
//String dirname = "";
//if((dirname = JOptionPane.showInputDialog(this , "Please input the new dir name" , "Input Dialog" , JOptionPane.QUESTION_MESSAGE)) != "")
{
try{
        String dirname = n.dirname;      //ÓÉ¶Ô»°¿ò°ÑÒªÐÂ½¨µÄÎÄ¼þ¼ÐÃû×ÖÈ¡³ö
        System.out.println(dirname);    //just for debug!
        File parentDir = (File)selectedNode.getUserObject();
        File newFile = new File(parentDir + "\\" + dirname);
        if(!newFile.exists())
            {
              newFile.mkdir();
              textArea.setText("Maked Directory " + dirname);
              }
        DefaultMutableTreeNode newNode = new DefaultMutableTreeNode(newFile);
        newNode.setAllowsChildren(true);
        System.out.println(selectedNode.getChildCount());    //just for debug!
        model.insertNodeInto(newNode,selectedNode,selectedNode.getChildCount());
        TreeNode[] nodes = model.getPathToRoot(newNode);
        TreePath path = new TreePath(nodes);
        tree.scrollPathToVisible(path);
    }
catch(ArrayIndexOutOfBoundsException e)
{
e.printStackTrace();
}
}
return;
}
else if(source == Delete)
{
File targetDir = (File)selectedNode.getUserObject();
if(JOptionPane.showConfirmDialog(this , "Are you sure to delete " + targetDir.toString() , "Delete Confirmed" , JOptionPane.YES_NO_OPTION , JOptionPane.WARNING_MESSAGE) == JOptionPane.OK_OPTION)
{
targetDir.delete();
                textArea.setText("Delete Directory " + targetDir);
                TreeNode tn=selectedNode.getParent();
                if(tn != null)
                model.removeNodeFromParent(selectedNode);
                model.nodeChanged(tn);
                return;
}
}
}//--------------------------------------------------------------------------------------------public void valueChanged(TreeSelectionEvent event)
{
    textArea.setText("");
    TreePath path = tree.getSelectionPath();
    if(path == null) return;
    DefaultMutableTreeNode selectNode = (DefaultMutableTreeNode)path.getLastPathComponent();
    if(selectNode.getAllowsChildren())Explorer2(selectNode);  //ÅÐ¶ÏÊÇ·ñ¿ÉÒÔÓÐ×Ó½Úµã£¬²Åµ÷ÓÃExplorer3(),²¢ÇÒÏÔÊ¾¸ÃÄ¿Â¼ÏÂËùÓÐÎÄ¼þÃû
    else
    {
File temp = (File)selectNode.getUserObject();
textArea.setText(temp.toString());          //Ö»ÏÔÊ¾Ñ¡ÖÐÎÄ¼þµÄÎÄ¼þÃû
}}//--------------------------------------------------------------------------------------------/*    public void Explorer(DefaultMutableTreeNode p)  //¼ì²âÄ¿Â¼µÄµÝ¹éËã·¨,Ò»´ÎÐÔÈ«²¿LoadÈë£¬Òò´ËËÙ¶ÈÂý£¬¶øÇÒÎÞ·¨ÏÔÊ¾±ä»¯£¬²»¿ÉÈ¡
{
try{boolean isAllFiles = true;
String[] list = path.list();
for(int i = 0; i<list.length;i++)
{
File NotKnown = new File(path + "\\" + list[i]);
if(NotKnown.isFile())
{
        textArea.append(list[i] + '\n');
p.add(new DefaultMutableTreeNode(NotKnown));
}else if(NotKnown.isDirectory())
{
        textArea.append(list[i] + '\n');
isAllFiles = false;
tempDir = new DefaultMutableTreeNode(NotKnown);
p.add(tempDir);
Explorer(tempDir);
}  }
            if(isAllFiles == true)return;}
catch(Exception e)
  {
    System.out.println("Error: " + e);
    }
}
  */
//------------------------------------------------------------------------------------------------------public static boolean isLeaf(File n)  //ÅÐ¶ÏÊÇ·ñÎªÒ³½Úµã£¬µ±ÎªÎÄ¼þ¶ø²»ÊÇÎÄ¼þ¼ÐÊ±£¬·µ»Øtrue£¬·ñÔò·µ»Øfalse
{
return n.isFile();
}//------------------------------------------------------------------------------------------------------public void Explorer2(DefaultMutableTreeNode p)  //¼ì²âÄ¿Â¼µÄ×îºÃ·½·¨
{
p.removeAllChildren();
try{
File path = (File)p.getUserObject();
String[] list = path.list();
for(int i = 0; i<list.length;i++)
{
File NotKnown = new File(path + "\\" + list[i]);
if(NotKnown.isFile())
{
        textArea.append(list[i] + '\n');
tempLeaf = new DefaultMutableTreeNode(NotKnown);
tempLeaf.setAllowsChildren(false);
p.add(tempLeaf);
}else if(NotKnown.isDirectory())
{
        textArea.append(list[i] + '\n');
    tempDir = new DefaultMutableTreeNode(NotKnown);
tempDir.setAllowsChildren(true);
p.add(tempDir);
}}
    }
catch(Exception e)
{
e.printStackTrace();
}
}
//------------------------------------------------------------------------------------------------------
private DefaultMutableTreeNode root;
private DefaultMutableTreeNode tempDir;  //ÔÝÊ±µÄÄ¿Â¼½Úµã±äÁ¿
private DefaultMutableTreeNode tempLeaf;  //ÔÝÊ±µÄÒ³½Úµã±äÁ¿
private DefaultTreeModel model;
private JTree tree;
private JTextArea textArea;
private JButton AddDir;                  //Ìí¼ÓÄ¿Â¼
private JButton Delete;                  //É¾³ýÄ¿Â¼
private NewDirDialog newDialog;          //¶Ô»°¿ò
}//=========================================================================================/*==================================NewDirInfo.class=====================================*/class NewDirInfo
{
public String dirname;
public NewDirInfo(String d)
{
dirname = d;
}
}//=========================================================================================/*==================================NewDirDialog.class=====================================*/class NewDirDialog extends JDialog implements ActionListener
{
public NewDirDialog(JFrame parent)
{
super(parent , "Make New Directory" , true);
Container contentPane = getContentPane();
JPanel p1 = new JPanel();
p1.setLayout(new GridLayout(1,2));
    p1.add(new JLabel("New Directory Name: "));
    p1.add(newdirname = new JTextField(""));
    contentPane.add("Center",p1);    JPanel p2 = new JPanel();
    okButton = addButton(p2,"ok");
    cancelButton = addButton(p2,"cancel");
    contentPane.add("South",p2);
    setSize(240,120);
}//-----------------------------------------------------------------------------------------
public void actionPerformed(ActionEvent evt)
{
Object source = evt.getSource();
if(source == okButton)
{
ok = true;
setVisible(false);
}
else if(source == cancelButton)
{
setVisible(false);
}
}//-----------------------------------------------------------------------------------------JButton addButton(Container c,String name)
    {
JButton button = new JButton(name);
button.addActionListener(this);
c.add(button);
return button;
}//-----------------------------------------------------------------------------------------public boolean showDialog(NewDirInfo newdir)
{
newdirname.setText(newdir.dirname);    //ÉèÖÃ¶Ô»°¿òµÄ³õÊ¼ÄÚÈÝ
ok = false;
show();    //ÏÔÊ¾¶Ô»°¿ò
if(ok)
{
newdir.dirname = newdirname.getText();
}
return ok;
}//-----------------------------------------------------------------------------------------    private JButton okButton;
    private JButton cancelButton;
    private boolean ok;
    private JTextField newdirname;
}还fix了删除后left tree没更新的bug.注意:
targetDir.delete();
                textArea.setText("Delete Directory " + targetDir);
                TreeNode tn=selectedNode.getParent();
                if(tn != null)
                model.removeNodeFromParent(selectedNode);
                model.nodeChanged(tn);
                return;

十分感谢你的帮忙！能给我你的OICQ号码吗？

10828539
但我一般不用,因为公司1080出不去。现在我用拨号所以我就开开吧。
我一般用msn工作时（[email protected]）

lusxiao(lusxiao)您改的相当准确，我想知道您是怎样调试的，我可能就是不懂调试的技巧
还有，我补充两句：用model.removeNodeFromParent(),model.insertNodeInto(),等等,它会自动通知树视图，并使之发生改变。(这是DefaultTreeModel的好处)。所以不需要加上model.nodeChanged(tn),model.nodeChanged()方法是用于保持节点结构不变，而改变用户对象时调用的方法。（基本上摘自《Java2核心技术----高级特性》)

但是我不知道为什么原来的程序我删除目录后，left就是不刷新。我机器慢？所以想都没想就加了那一句。见笑了。

调试的技巧需要大量的编程经验。
不知你有没有兴趣：http://www.csdn.net/expert/topic/309/309124.shtm

先再又试了一下。好像是可以的。当时可能看错了。又急着贴代码。就没多想。我swing的知识有限。见笑了。

调试易

谁能帮我解决这里添加目录时出现的ArrayIndexOutOfBoundsException？

解决方案 »