Java Utililty Methods File List Load

File rootDir = new File(directory);
String[] allFilenames = rootDir.list();
java.util.regex.Pattern pattern = java.util.regex.Pattern.compile(filterRegexp);
List<String> filteredFilenames = new ArrayList<String>();
for (int i = 0; i < allFilenames.length; i++) {
    Matcher matcher = pattern.matcher(allFilenames[i]);
    if (matcher.find()) {
        filteredFilenames.add(getPath(directory, allFilenames[i]));
...

File directory = new File(directoryPath);
if (directory.exists()) {
    return directory.list();
return new String[] {};

ArrayList<File> files = new ArrayList<File>();
File file = new File(filePath);
if (file.exists() && file.isDirectory()) {
    File[] fa = file.listFiles(fileFilter);
    for (int i = 0; i < fa.length; i++) {
        if (fa[i].isFile())
            files.add(fa[i]);
        else if (recursive && fa[i].isDirectory())
...

List<File> files = new ArrayList<>();
File folder = new File(folderPath);
for (final File fileEntry : folder.listFiles()) {
    if (fileEntry.isFile()) {
        files.add(fileEntry);
return files;
...

File inputFile = getNormalFile(inputFilename);
ArrayList<File> fileList = new ArrayList<File>();
FileReader fr = new FileReader(inputFile);
BufferedReader br = new BufferedReader(fr);
String filename;
try {
    while ((filename = br.readLine()) != null) {
        filename = filename.trim();
...

File dirFile = new File(path);
File[] fileList = dirFile.listFiles();
return fileList;

File directory = new File(path);
if (directory.isDirectory()) {
    return directory.list();
} else {
    System.out.println("Lessons directory not found! at " + directory.getAbsolutePath());
    return null;

File[] fileList = new File(path).listFiles(new FileFilter() {
    @Override
    public boolean accept(File pathname) {
        String str = pathname.getName().toLowerCase();
        if (str.endsWith(".nes") || str.endsWith(".zip"))
            return true;
        else
            return false;
...

List<File> result = new ArrayList<File>();
File file = new File(path);
File[] tempList = file.listFiles();
for (int i = 0; i < tempList.length; i++) {
    if (tempList[i].isFile()) {
        result.add(tempList[i]);
    if (tempList[i].isDirectory()) {
...

File file = new File(path);
String[] array = null;
String temp = "";
if (!file.isDirectory()) {
    return null;
array = file.list();
if (array != null && array.length > 0) {
...