Java Utililty Methods File Name Get

File dir = new File(dirctory);
File[] fileArray = dir.listFiles();
String[] filenames = new String[fileArray.length];
for (int i = 0; i < fileArray.length; i++) {
    if (fileArray[i].isDirectory()) {
        filenames[i] = "[" + fileArray[i].getName() + "]";
    } else {
        filenames[i] = fileArray[i].getName();
...

if (isArchive(file)) {
    try {
        ZipFile zip = new ZipFile(new File(directory + System.getProperty("file.separator") + file));
        Enumeration<ZipEntry> entries = (Enumeration<ZipEntry>) zip.entries();
        while (entries.hasMoreElements()) {
            ZipEntry entry = (ZipEntry) entries.nextElement();
            if (isArchive(entry.getName())) {
                return unzipZipFile(zip, directory);
...

return getFileNames(dirPath, null);

String[] aryNames = filenames.split(",");
List<String> list = new ArrayList<>();
for (String s : aryNames) {
    File path = new File(s.trim());
    if (path.isDirectory()) {
        path.listFiles(new FilenameFilter() {
            @Override
            public boolean accept(File dir, String name) {
...

File dir = new File(path);
String[] children = dir.list();
if (children == null) {
    return null;
FilenameFilter filter = new FilenameFilter() {
    @Override
    public boolean accept(File dir, String name) {
...

List<File> al = getFiles(path);
String[] fl = null;
if (al != null && !al.isEmpty()) {
    fl = new String[al.size()];
    for (int i = 0; i < al.size(); i++) {
        fl[i] = al.get(i).getName();
return fl;

File indexDir = new File(rootDir.getAbsoluteFile(), indexName);
assert indexDir.exists();
String[] fileNames = indexDir.list();
assert fileNames.length > 0;
return fileNames;

ArrayList<String> list = new ArrayList();
try {
    JarFile jarFile = new JarFile(source);
    Enumeration e = jarFile.entries();
    while (e.hasMoreElements()) {
        JarEntry je = (JarEntry) e.nextElement();
        if (je.isDirectory() || !je.getName().endsWith(extension) || !je.getName().startsWith(folder)) {
            continue;
...

List<String> filenames = new ArrayList<>();
ZipFile z;
try {
    z = new ZipFile(zipFile);
    Enumeration<? extends ZipEntry> en = z.entries();
    while (en.hasMoreElements()) {
        ZipEntry ze = en.nextElement();
        filenames.add(ze.getName());
...

final File currentDir = new File(pDataDir);
if (!isDir(currentDir)) {
    throw new IllegalStateException("Not a dir: " + pDataDir);
final LinkedList<String> files = new LinkedList<String>();
final File[] listFiles = currentDir.listFiles();
if (listFiles != null) {
    for (final File listFile : listFiles) {
...