Traversing directories without using recursion?

Question

The Problem I need to write a simple software that, giving certain constraints, appends to a list a series of files. The user could choose between

Answer 1

I am a real novice, but after working for a week on this problem... I have a clean solution... thanks for all the help from PATRY and etbal.

public class Recur {
    // Process only directories under dir

File dir;
static DirectoryComponent allDirectory;

    public Recur(File dir, DirectoryComponent allDirectory) {
    // TODO Auto-generated constructor stub
        this.dir = dir;
}

    public static DirectoryComponent Recur(File dir, DirectoryComponent allDirectory) {
        String file;
        String path;

         File firstDir = new File(dir.getPath());
         file = firstDir.getName();
         path = firstDir.getPath();

        if (dir.isDirectory()) {

            file = firstDir.getName();
            path = firstDir.getPath();
            DirectoryComponent directory = new Directory(file, path);
            allDirectory.add(directory);

            String [] subNote = dir.list();
            for(String filename : subNote){
                File subNode = new File(firstDir, filename);

                // store current child name

                    file = subNode.getName();
                    path = subNode.getPath();
                    directory.add(new FileItem(file,path));         
            }

            String[] children = dir.list();
            for (int i=0; i