import java.io.IOException;

import java.nio.file.DirectoryStream;

import java.nio.file.*;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.ArrayList;

import java.util.List;

public class dd {

private static List<Path> paths = new ArrayList<>();

private static List<Path> walk(Path path) throws IOException {

try (DirectoryStream<Path> stream = Files.newDirectoryStream(path))

{

Path dummy = Paths.get(" ");

for (Path entry : stream) {

if (Files.isDirectory(entry)) {

paths.add(entry.getFileName());

paths.add(dummy);

walk(entry);

}

else if (Files.isRegularFile(entry)){

paths.add(entry.getFileName());

}

}

}

return paths;

}

public static void main(String[] args) throws IOException {

Path myPath = Paths.get("D:\\folder");

List<Path> paths = walk(myPath);

paths.forEach(path -> System.out.println(path));

}

}