├

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.FileFilter;
public class Folder{
private static FolderFilter folderFilter;
private static FilesFilter filesFilter;
public static void main(String[] args){
folderFilter=new FolderFilter();
filesFilter=new FilesFilter();
switch(args.length){
      case 0:tree(".");break;
      case 1:tree(args[0]);break;
      case 2:
          if(args[0].toLowerCase().equals("add")){
              //添加新文件夹
          }
          else if(args[0].toLowerCase().equals("del")){
              //删除文件夹
          }
          tree(".");
          break;
}
}
public static void tree(String path){
     try{
        System.out.println(new File(path).getCanonicalPath());
           doTree(new File(path),"");
        }
        catch(IOException ex){
            ex.printStackTrace();
        }
}
private static void doTree(File parent,String prefix){
File[] subItems=parent.listFiles(folderFilter);
int count=parent.listFiles().length;
for(int i=0;i<subItems.length;i++){
      if(i==count-1){
       System.out.println(prefix+"└"+subItems[i].getName());
       doTree(subItems[i],prefix.concat(" "));
      }
      else{
       System.out.println(prefix+"├"+subItems[i].getName());
       doTree(subItems[i],prefix.concat("│"));
      }
}
subItems=parent.listFiles(filesFilter);
for(int i=0;i<subItems.length;i++){
      if(i==subItems.length-1){
       System.out.println(prefix+"└"+subItems[i].getName());
      }
      else{
       System.out.println(prefix+"├"+subItems[i].getName());
      }
}
}
}
class FolderFilter implements FileFilter{
public boolean accept(File file){
return file.isDirectory();
}
}
class FilesFilter implements FileFilter{
public boolean accept(File file){
return file.isFile();
}
}