Java Utililty Methods File List Load

List<File> fileList = new ArrayList<File>();
File[] files = new File(path).listFiles();
if (!filterName.equals("") && filterName != null) {
    for (File file : files) {
        if (file.isDirectory()) {
            continue;
        if (file.getName().endsWith(filterName)) {
...

final File dir = new File(path);
class PatternFilter implements FilenameFilter {
    final String regexExpression;
    public PatternFilter(String regex) {
        regexExpression = regex;
    @Override
    public boolean accept(File f, String name) {
...

Vector<File> fileList = new Vector<File>();
File dir = new File(path);
File[] files = dir.listFiles();
if (files != null) {
    for (int i = 0; i < files.length; i++) {
        if (files[i].getName().contains(searchString)) {
            fileList.add(files[i]);
    Collections.sort(fileList);
    return fileList;
return null;

List<File> ret = new ArrayList<File>();
if (isDirectory(s)) {
    File[] files = new File(s).listFiles();
    if (files != null) {
        for (File f : files) {
            if (f.isFile()) {
                ret.add(f);
File[] out = new File[ret.size()];
out = ret.toArray(out);
return out;

java.util.ArrayList<String> sArray = new java.util.ArrayList<String>();
ZipFile zFile = new ZipFile(zipFilePath);
Enumeration<? extends ZipEntry> entries = zFile.entries();
while (entries.hasMoreElements()) {
    ZipEntry entry = entries.nextElement();
    String filePath = entry.getName();
    sArray.add(filePath);
return sArray;

Stack<File> stack = new Stack<File>();
stack.push(file);
File fileInStack = null;
List<File> fileList = new ArrayList<File>();
while (!stack.isEmpty()) {
    fileInStack = stack.pop();
    File[] files = fileInStack.listFiles();
    for (File eachFile : files) {
...

File file = new File(location);
if (file.isDirectory()) {
    String[] lists = file.list(new FilenameFilter() {
        public boolean accept(File dir, String name) {
            if (name.endsWith(extension.toLowerCase()) || name.endsWith(extension.toUpperCase())) {
                return true;
            return false;
...

File file = new File(dir);
if (!file.isDirectory()) {
    return null;
FilenameFilter filter = new FilenameFilter() {
    public boolean accept(File dir, String name) {
        return name.matches(regex);
};
return file.list(filter);

Set<String> set = new TreeSet<String>();
if (path.isDirectory()) {
    String[] files = path.list();
    for (String file : files) {
        walkInDirForFiles(path, file, set);
} else {
    set.add(path.toString());
...

ArrayList<File> results = new ArrayList<>();
File[] files = new File(path).listFiles();
for (File file : files) {
    if (file.isFile()) {
        results.add(file);
return results.toArray(new File[0]);
...