Re: List of files with given extension in a directory

From:

Hakan <H.L@softhome.net>

Newsgroups:

comp.lang.java.programmer

Date:

Fri, 21 Aug 2009 13:27:11 +0200

Message-ID:

<1250854031.36@user.newsoffice.de>

John B. Matthews wrote:

I use the following recursive algorithm to traverse the directory tree.
The accept() method in your FilenameFilter is usually called by a
FileDialog instance, but there's no reason you can't call it yourself as
you visit entries.

<code>
import java.io.*;

public class ListDir {

    public static void main(String args[]) {
        File root;
        if (args.length > 0) root = new File(args[0]);
        else root = new File(System.getProperty("user.dir"));
        ls(root);
    }

    private static void ls(File f) {
        File list[] = f.listFiles();
        for (File file : list) {
            if (file.isDirectory()) ls(file);
            else System.out.println(file);
        }
    }
}
</code>

I tried with an alternative version of this code. A special class
implementing Filenamefilter to search for directories, but it does not
work. Can you tell me why? The accept method just gives me false even
for directory files. I quote the code here.

public class Dirfilt implements FilenameFilter {

static String backsla="\\"; /* Windows systems delimiter*/

  public boolean accept(File dir,String name)
{
  String dirpath=dir.getAboslutePath();
  String fpath=dirpath+backsla+name;
  File newfile=new File(fpath);

return newfile.isDirectory();
}

}

Thanks in advance.

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