list all files from directories and subdirectories in Java

Question

What would be the fastest way to list the names of files from 1000+ directories and sub-directories? EDIT; The current code I use is: ``` import java.io.File; public class DirectoryReader { static int spc_count=-1; static void Process(File aFile) { spc_count++; String spcs = ""; for (int i = 0; i < spc_count; i++) spcs += " "; if(aFile.isFile()) System.out.println(spcs + "[FILE] " + aFile.getName()); else if (aFile.isDirectory()) { System.out.println(spcs + "[DIR] " + aFile.getName()); File[] listOfFiles = aFile.listFiles(); if(listOfFiles!=null) { for (int i = 0; i < listOfFiles.length; i++) Process(listOfFiles[i]); } else { System.out.println(spcs + " [ACCESS DENIED]"); } } spc_count--; } public static void main(String[] args) { String nam = "D:/"; File aFile = new File(nam); Process(aFile); } } ```

Accepted Answer

This looks fine (Recursively going through the directory) The bottleneck will be all the file i/o you need to do, optimizing your Java will not show any real improvements.

list all files from directories and subdirectories in Java

Solution

Problem