/**
 * 定義文件按目錄樹的節(jié)點(diǎn)類，繼承DefaultMutableTreeNode
 */
import java.io.File;

class FileNode extends javax.swing.tree.DefaultMutableTreeNode 
{
        private boolean extended = false;
        public FileNode(File file) 
        {
            setUserObject(file);
        }

        public boolean getAllowsChildren() 
        {
            return isDirectory();
        }

        public boolean isLeaf() 
        {
            return!isDirectory();
        }

        public File getFile() 
        {
            return (File) getUserObject();//返回此節(jié)點(diǎn)的用戶對(duì)象
        }

        public boolean isExtended() 
        {
            return extended;
        }

        public boolean isDirectory() 
        {
            return getFile().isDirectory();
        }

        public String toString() 
        {
            File file = (File) getUserObject();
            String filename = file.toString();
            int index = filename.lastIndexOf(File.separator);//c:\text.txt
            return (index != -1 && index != filename.length() - 1) ? filename.substring(index + 1) : filename;
        }
//*******************************************展開節(jié)點(diǎn)，獲得節(jié)點(diǎn)的子目錄
        public void Extend() 
        {
            if (!isDirectory()) 
            {
                return;
            }
            if (!isExtended()) 
            {
                File file = getFile();
                File[] children = file.listFiles();//返回一個(gè)抽象路徑名數(shù)組，這些路徑名表示此抽象路徑名所表示目錄中的文件
                for (int i = 0; i < children.length; ++i) 
                {
                    File f = children[i];
                    if (f.isDirectory())
                     {
                        add(new FileNode(children[i]));
                    }
                }
                extended = true;
            }
        }
  //********************************************************************************
 }