Java Utililty Methods Folder Read

File directory = new File(directoryName);
File[] fList = directory.listFiles();
List<File> fileList = new ArrayList<File>();
if (fList == null) {
    return fileList;
for (File file : fList) {
    if (!file.getName().matches(regexPattern)) {
...

File[] listFiles = baseStorePath.listFiles(new FileFilter() {
    @Override
    public boolean accept(File pathname) {
        if (pathname.getName().indexOf(fileNameSearchPattern) > -1) {
            return true;
        return false;
});
return listFiles;

ArrayList<String> mFileList = new ArrayList<String>();
File root = new File(path);
if (!storageReady()) {
    return null;
if (!root.exists()) {
    if (!createFolder(path)) {
        return null;
...

File[] files = new File(directory).listFiles();
Arrays.sort(files, new Comparator<File>() {
    @Override
    public int compare(File o1, File o2) {
        if (earliestFirst) {
            return new Long(o1.lastModified()).compareTo(new Long(o2.lastModified()));
        } else {
            return new Long(o2.lastModified()).compareTo(new Long(o1.lastModified()));
...

final Collection<File> filesList = new ArrayList<>(1);
getFilesByNameRecursive(filesList, path, name);
return filesList;

List fileList = new ArrayList();
File dir = new File(toDir);
File[] files = dir.listFiles();
String podOrderDir = toDir;
System.out.println(podOrderDir);
System.out.println("size:" + files.length);
for (int i = 0; i < files.length; i++) {
    if (files[i].isDirectory()) {
...

if (dir == null)
    throw new NullPointerException("dir must not be null");
File dirc = new File(dir);
if (!dirc.exists() || !dirc.isDirectory()) {
    throw new IllegalArgumentException("dir must be exists directory");
File[] files = dirc.listFiles(new FileFilter() {
    @Override
...

return getFilesByType(fileType, allFiles(path));

File dir = new File(path);
File[] files = dir.listFiles(new FileFilter() {
    public boolean accept(File afile) {
        return afile.getName().endsWith(type) && afile.isFile();
});
return files == null ? new File[] {} : files;

ArrayList<File> failAccess = new ArrayList<File>();
for (File file : files) {
    if (file.exists() && !file.canWrite()) {
        failAccess.add(file);
return failAccess;