The File class can handle the modification time. The sorting can be done by a
List in conjunction with Collections.sort(). As for efficient, what is your
definition of "efficient"?

On Mar 8, 11:08 pm, gde...@gmail.com wrote:

Learning by example:
public class ModifiedFileList {
   public static void main(String[] args) {
       File[] files = new File(args[0]).listFiles();
       Arrays.sort(files, new Comparator<File>() {
           public int compare(File o1, File o2) {
               return o1.lastModified() < o2.lastModified() ? -1 :
                       o1.lastModified() == o2.lastModified() ? 0 :
1;
           }
       });
       for (File file: files) {
           System.out.println(file.lastModified() + ": " +
file.toString());
       }
   }

}