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

PARTY, thank you for advice. I transformed a little bit your code, that's what I've got

private ArrayList displayDirectory(File node){
ArrayList FileList = new ArrayList();
ArrayList directories = new ArrayList();
if (node.isDirectory())
   directories.add(node);
// Iterate over the directory list
Iterator it = directories.iterator();
for (int i = 0 ; i < directories.size();i++){
   File dir  =  directories.get(i);
   // get childs
   String[] subNode = dir.list();
   for(int j = 0 ; j < subNode.length;j++){
      File F = new File( directories.get(i).getAbsolutePath(), subNode[j]);
      // display current child name
    //  System.out.println(F.getAbsoluteFile());
      // if directory : add current child to the list of dir to process
      if (F.isDirectory()) directories.add(F);           
        else   FileList.add(F);
      }
}   
return FileList;
}