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

My iterative solution:

  ArrayDeque stack = new ArrayDeque();

    stack.push(new File(""));

    int n = 0;

    while(!stack.isEmpty()){

        n++;
        File file = stack.pop();

        System.err.println(file);

        File[] files = file.listFiles();

        for(File f: files){

            if(f.isHidden()) continue;

            if(f.isDirectory()){
                stack.push(f);
                continue;
            }

            n++;
            System.out.println(f);


        }

    }

    System.out.println(n);