Java Utililty Methods File Find

List of utility methods to do File Find

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Description

The list of methods to do File Find are organized into topic(s).

Method

Filefind(final File root, final String name)
find 
if (root.getName().equals(name)) {
    return root;
if (root.isDirectory()) {
    for (final File child : root.listFiles()) {
        final File result = find(child, name);
        if (result != null) {
            return result;
...
Stringfind(String _sSourceString, String _sReg, int group)
find 
return find(_sSourceString, _sReg, group, "GBK", "GBK");
Filefind(String executable, File... dirs)
Tries to find an executable with the given name. 
if (dirs != null) {
    for (File hint : dirs) {
        File file = findExecutableInDirectory(executable, hint);
        if (file != null) {
            return file;
return findExecutableInSystemPath(executable);
Filefind(String name, File dir)
Find a file in an extracted OAR directory 
File found = null;
File[] files = dir.listFiles();
if (files != null) {
    for (File file : files) {
        if (file.isDirectory()) {
            found = find(name, file);
            if (found != null)
                break;
...
Listfind(String path, String matcher)
find 
List<File> files = new ArrayList<File>();
File root = new File(path);
File[] list = root.listFiles();
if (list == null)
    return files;
for (File file : list) {
    if (file.getName().matches(matcher)) {
        files.add(file);
...
booleanfind(String path, String suffix)
find 
File[] files = (new File(path)).listFiles();
for (File file : files) {
    if (file.isDirectory())
        return find(file.getAbsolutePath(), suffix);
    else if (file.getName().endsWith(suffix))
        return true;
return false;
...
voidfind2(File baseDir, FileFilter filter, List files, boolean includeHiddenFiles)
find 
assert baseDir != null && filter != null && files != null;
for (File f : baseDir.listFiles()) {
    if (f.equals(baseDir)) {
        continue;
    if (!includeHiddenFiles && f.isHidden()) {
        continue;
    assert includeHiddenFiles || !f.getName().startsWith(".") : f;
    if (filter.accept(f)) {
        if (f.exists()) {
            files.add(f);
        } else {
    if (f.isDirectory()) {
        find2(f, filter, files, includeHiddenFiles);
File[]findByExt(File base, String ext)
find By Ext 
Vector result = new Vector();
findByExtWorker(result, base, ext);
Object objs[] = result.toArray();
File files[] = new File[objs.length];
System.arraycopy(objs, 0, files, 0, objs.length);
return files;
ListfindByExtension(final File directory, final String extension)
Find the files with an extension inside a directory. 
assert directory.isDirectory();
File[] res = directory.listFiles(fileName -> fileName.getName().endsWith(extension));
if (res == null) {
    return Collections.emptyList();
return Arrays.asList(res);
FilefindByFileName(List files, String fileName)
find By File Name 
for (File itFile : files) {
    if (itFile.getName().equals(fileName)) {
        return itFile;
throw new FileNotFoundException("The file name " + fileName + " doesn't exist");