import java.io.File;

public class Filep {

    public static File f = new File("E:\\javatest");

    public static File ff;

    public static String findfile(File f){

        if(f.list()==null) return null;

        String[] str = f.list();

        for(String ss: str)

        {

            System.out.println(f.getAbsolutePath()+"\\"+ss);

            ff = new File(f.getAbsolutePath()+"\\"+ss);

            findfile(ff);

        }

        return null;

    }

  public static void main(String argv[])

  {

    findfile(f);

  }

}