Java Utililty Methods File Delete nio

if (f.isDirectory() && !Files.isSymbolicLink(Paths.get(f.toURI()))) {
    for (File c : f.listFiles()) {
        delete(c);
f.delete();

if (file.isDirectory()) {
    File[] children = file.listFiles();
    if (children == null) {
        String msg = "Could not access content of " + file.getAbsolutePath();
        throw new IOException(msg);
    for (File f : children)
        delete(f);
...

return delete(file.toPath());

if (file.isFile()) {
    deleteQuietly(file);
} else if (file.isDirectory()) {
    Path directory = file.toPath();
    try {
        Files.walkFileTree(directory, new SimpleFileVisitor<Path>() {
            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
...

if (!file.exists())
    return true;
try {
    final FileSystem fileSystem = FileSystems.getDefault();
    final Path path = fileSystem.getPath(file.getAbsolutePath());
    Files.delete(path);
    return true;
} catch (FileSystemException e) {
...

for (int n = 0; n < 10; n++) {
    try {
        Files.delete(file.toPath());
        if (Files.exists(file.toPath())) {
            Uninterruptibles.sleepUninterruptibly(200, TimeUnit.MILLISECONDS);
            continue;
        return;
...

if (!file.exists())
    return;
if (file.isDirectory()) {
    for (File child : listFiles(file)) {
        delete(child);
Files.delete(file.toPath());
...

if (file.isDirectory()) {
    deleteDirectory(file);
    return;
Files.delete(Paths.get(file.getPath()));

Files.walk(toRecurse.toPath(), FileVisitOption.FOLLOW_LINKS).sorted(Comparator.reverseOrder())
        .map(Path::toFile).forEach(File::delete);

if (!directory.exists() || !directory.isDirectory())
    throw new FileNotFoundException("No directory found at " + directory);
for (File file : directory.listFiles(fileFilter))
    Files.delete(file.toPath());