List Files And Directories

Recursivesly lists files and directories and prints them as a tree structure.

import java.io.*;
import java.util.*;
/**
 * Ynori7
 * 9.26.07
 */
public class Tree
{    
    ArrayList<String> filelist = new ArrayList<String>();
    public Tree()
    {
        String a = "C:\\"; //change this to whatever directory you wanna search
        int counter = -1;
        recur(a, counter);
        SaveFile();
    }
    
    private void recur(String a, int counter)
    {
        File dir = new File(a); //opens the specified directory
        counter++;
            
        if(dir.exists()) //checks to see if the specified path is acceptable
        {
            String[] files = dir.list();
            for(int i=0; i< files.length; i++)
            {
                String c="";
                for(int x=0; x< counter; x++)
                { c+="   ";} //tabs in to show that stuff is inside a folder
                filelist.add(c+files[i]);
                System.out.println(c+files[i]);
                String b = a+"\\"+files[i];
                try{
                    recur(b, counter);
                }catch(Exception e){} //makes sure you're opening a folder, not a file
            }
        }
        else{ System.out.println("Folder not found"); }
    }
    
     //save data to a text file
     private void SaveFile()
     {        
         try
         {
             //both file and print writer needed. fileID is the name of the file.
             FileWriter fileID = new FileWriter ("FileListSave.txt");
             PrintWriter outFile = new PrintWriter(fileID);
             
             for(int x = 0; x<filelist.size(); x++)
             {
                 outFile.println( filelist.get(x) );
             }
             outFile.close();
         }
         catch (IOException io)
         {
             System.out.println("");
             System.out.println("---Error writing to the data file -"+ io.getMessage()+"---");
         }
         System.exit(0);
     }

    public static void main(String[] args)
    {
        new Tree();
            
    }
}