Thread: Java program which can list all files in a given directory

With this code you can list all files in a given directory:

import java.io.File;
 
public class ListFiles 
{
 
 public static void main(String[] args) 
{
 
  // Directory path here
  String path = "."; 
 
  String files;
  File folder = new File(path);
  File[] listOfFiles = folder.listFiles(); 
 
  for (int i = 0; i < listOfFiles.length; i++) 
  {
 
   if (listOfFiles[i].isFile()) 
   {
   files = listOfFiles[i].getName();
   System.out.println(files);
      }
  }
}
}

If you want to list only .txt files for example, Use this code:

import java.io.File;
 
public class ListFiles 
{
 
 public static void main(String[] args) 
{
 
  // Directory path here
  String path = "."; 
 
  String files;
  File folder = new File(path);
  File[] listOfFiles = folder.listFiles(); 
 
  for (int i = 0; i < listOfFiles.length; i++) 
  {
 
   if (listOfFiles[i].isFile()) 
   {
   files = listOfFiles[i].getName();
       if (files.endsWith(".txt") || files.endsWith(".TXT"))
       {
          System.out.println(files);
        }
     }
  }
}
}

You can modify the .txt or .TXT to be whatever file extension you wish.

Very clever indeed.

Thx !!! Nice Info !!!

good job friends.

the code which is written by javapf is
can be modify
i think the if code totlly write into a function
we will display the files if it is a file other wise we call recursively that function again
we can get all files and folders recursivly with that method.
bye guys.

I know I am fairly new to Developing with java but I feel you could change the line

if (files.endsWith(".txt") || files.endsWith(".TXT"))

with

if (files.toLowerCase().endsWith(".txt"))

and this way you can exclude the or statement ( || ) and allow for any possible variation in the extension, .txt / .Txt / .tXt / .tXT / .TXT / .TXt (I think that is all), I think it will make for cleaner and more defined code, and that way no matter how ever the casing is you can still get all the possible files with that extension. Let me know if I am wrong...But I love the example... Below is the changed code:

Originally Posted by JavaPF

With this code you can list all files in a given directory:

import java.io.File;
 
public class ListFiles 
{
 
 public static void main(String[] args) 
{
 
  // Directory path here
  String path = "."; 
 
  String files;
  File folder = new File(path);
  File[] listOfFiles = folder.listFiles(); 
 
  for (int i = 0; i < listOfFiles.length; i++) 
  {
 
   if (listOfFiles[i].isFile()) 
   {
   files = listOfFiles[i].getName();
   System.out.println(files);
      }
  }
}
}

If you want to list only .txt files for example, Use this code:

import java.io.File;
 
public class ListFiles 
{
 
 public static void main(String[] args) 
{
 
  // Directory path here
  String path = "."; 
 
  String files;
  File folder = new File(path);
  File[] listOfFiles = folder.listFiles(); 
 
  for (int i = 0; i < listOfFiles.length; i++) 
  {
 
   if (listOfFiles[i].isFile()) 
   {
   files = listOfFiles[i].getName();
       if (files.toLowerCase().endsWith(".txt"))
       {
          System.out.println(files);
        }
     }
  }
}
}

You can modify the .txt to be whatever file extension you wish.

Originally Posted by helloworld922

import java.io.File;
 
public class ListFiles 
{
 
 public static void main(String[] args) 
{
 
  // Directory path here
  String path = "."; 
 
  String files;
  File folder = new File(path);
  File[] listOfFiles = folder.listFiles(new MyFilter()); 
 
  for (int i = 0; i < listOfFiles.length; i++) 
  {
          System.out.println(listOfFiles[i].getName());
  }
}
}

Do you have to give your new filter() a value? I mean, how does java know what you want to filter if you just say myfilter..