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

  1. #1
    mmm.. coffee JavaPF's Avatar
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    Default 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.

  2. The Following User Says Thank You to JavaPF For This Useful Post:

    aaronjsmith21 (August 16th, 2012)


  3. #2
    Junior Member Ciwan's Avatar
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    Default Re: How to List all files in a directory

    This might come in handy one day !

    Thanks JavaPF
    "Extraordinary Claims Require Extraordinary Evidence" .... American Astrochemist Carl Sagan.

  4. #3
    Member Fendaril's Avatar
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    Default Re: How to List all files in a directory

    Very clever indeed.

  5. #4
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    Default Re: How to List all files in a directory

    Thx !!! Nice Info !!!

  6. #5
    Super Moderator helloworld922's Avatar
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    Default Re: How to List all files in a directory

    Alternative to test for files with a certain ending:

    MyFilter implements FileFilter
    {
         public boolean accepts(File pathname)
         {
              if (pathname.endswith(".txt") || pathname.endswith(".TXT"))
              {
                   return true;
              }
              return false;
         }
    }

    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());
      }
    }
    }

    technically, this code will display folders named hello.txt, or this is a directory.txt, but I think it's fairly safe to assume that most people won't name their directories this way.

  7. #6
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    Default Re: How to List all files in a directory

    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.

  8. #7
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    Default Re: How to List all files in a directory

    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:

    Quote Originally Posted by JavaPF View Post
    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.

  9. #8
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    Default

    Quote Originally Posted by helloworld922 View Post
    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..

  10. #9
    Senior Member PhHein's Avatar
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    Default Re: Java program which can list all files in a given directory

    Stayawake, stay awake and have a look at the timestamps. This thread is years old.
    MyFilter's implementation knows it.

  11. The Following User Says Thank You to PhHein For This Useful Post:

    Stayawake (July 10th, 2013)

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