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Howto Sort Files and Directories

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Janek Schwarz

Posts: 95
Nickname: jschwarz
Registered: Nov, 2004

Janek Schwarz is a software developer specialized in client-side Java technologies
Howto Sort Files and Directories Posted: Jan 16, 2005 3:18 PM
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This post originated from an RSS feed registered with Java Buzz by Janek Schwarz.
Original Post: Howto Sort Files and Directories
Feed Title: The Wannabe Java Rockstar
Feed URL: http://weblog.janek.org/Archive/Categories/javablogs.rss.xml
Feed Description: The Wannabe Java Rockstar: Janek's weblog where all posts go to Eleven 		Latest Java Buzz Posts
Latest Java Buzz Posts by Janek Schwarz
Latest Posts From The Wannabe Java Rockstar

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Via Technorati's new tag feature I found a quick and dirty algorithm for sorting files and directories. The author asked for improved versions. Here's mine:

import java.io.File;
import java.text.Collator;
import java.util.Arrays;
import java.util.Comparator;

public class FileSort
{
public static void main(String[] args)
{
  File dir = new File("D:/home/schwarz/Eigene Dateien");
  File[] selectedFiles = dir.listFiles();

  for(int i = 0; i < selectedFiles.length; i++)
    System.err.println(selectedFiles[i]);

  Arrays.sort(selectedFiles, new FileComparator());

  for(int i = 0; i < selectedFiles.length; i++)
    System.err.println(selectedFiles[i]);
}

private static class FileComparator
  implements Comparator
{
private Collator c = Collator.getInstance();

public int compare(Object o1,
                   Object o2)
{
  if(o1 == o2)
    return 0;

  File f1 = (File) o1;
  File f2 = (File) o2;

  if(f1.isDirectory() && f2.isFile())
    return -1;
  if(f1.isFile() && f2.isDirectory())
    return 1;

  return c.compare(f1.getName(), f2.getName());
}
}
}

Read: Howto Sort Files and Directories

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