Нужна помощь

package com.javarush.task.task31.task3101; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.*; /* Проход по дереву файлов */ public class Solution { public static void main(String[] args) throws IOException { File direct = new File(args[0]); File resultFileAbsolutePath = new File(args[1]); List<File> files = FileUtils.getFileDirectory(direct); Comparator<File> comparator = (o1, o2) -> o1.getName().compareTo(o2.getName()); Collections.sort(files, comparator); String newNameFile = resultFileAbsolutePath.getParent() + "\\allFilesContent.txt"; File newFile = new File(newNameFile); if (FileUtils.isExist(resultFileAbsolutePath)) { FileUtils.renameFile(resultFileAbsolutePath, newFile); } FileOutputStream outputStream = new FileOutputStream(newNameFile); for (int i = 0; i < files.size(); i++) { FileInputStream inputStream = new FileInputStream(files.get(i)); while (inputStream.available() > 0) { outputStream.write(inputStream.read()); } outputStream.write('\\'); outputStream.write('n'); inputStream.close(); } outputStream.close(); } }