[hardwired]

Code:

import java.io.File;
import java.util.*;

public class GatheringFiles {
    public static void main(String[] args) {
        File folder = new File(".");
        List<File> list = new ArrayList<File>();
        getFiles(folder, list);
        System.out.println("list.size = " + list.size());
    }

    private static void getFiles(File folder, List<File> list) {
        folder.setReadOnly();
        File[] files = folder.listFiles();
        for(int j = 0; j < files.length; j++) {
            list.add(files[j]);
            if(files[j].isDirectory())
                getFiles(files[j], list);
        }
    }
}