Java Utililty Methods Directory to File List

List of utility methods to do Directory to File List

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Description

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

Method

ListgetAllFilesIn(File dir, final String type)
get All Files In 
return Arrays.asList(dir.listFiles(new FilenameFilter() {
    @Override
    public boolean accept(File arg0, String arg1) {
        return arg1.endsWith(type);
}));
ListgetAllFilesInAllSubDirectories(File parentDir, FileFilter filter)
Returns all the files that satisfy the filter criteria wherever (in any replace-directory) they are inside this folder 
List<File> filesList = null;
return getAllFilesInAllSubDirectories(filesList, parentDir, filter);
ListgetAllFilesInDir(boolean traverseSubDirs, File dir, boolean includeHidden, String prefix)
get All Files In Dir 
List<String> files = new ArrayList<String>();
String fileNames[] = dir.list();
for (String fileName : fileNames) {
    File currentFile = new File(dir, fileName);
    if (currentFile.isHidden() && !includeHidden) {
        continue;
    if (currentFile.isDirectory()) {
...
ListgetAllFilesInDirectory(File dir)
get All Files In Directory 
return getAllFilesInDirectory(dir, true);
voidgetAllFilesInDirectory(File directory, List files)
get All Files In Directory 
File[] fList = directory.listFiles();
for (File f : fList) {
    if (f.isFile()) {
        files.add(f);
    } else if (f.isDirectory()) {
        getAllFilesInDirectory(f, files);
ListgetAllFilesInDirectory(String directoryPath)
get All Files In Directory 
return getAllFilesInDirectory(directoryPath, null);
ListgetAllFilesInDirectory(String dirName)
get All Files In Directory 
File folder = new File(dirName);
File[] listOfFiles = folder.listFiles();
List<File> result = new ArrayList<>();
for (int i = 0; i < listOfFiles.length; i++) {
    if (listOfFiles[i].isFile()) {
        result.add(listOfFiles[i]);
return result;
File[]getAllFilesInDirectory(String path)
Returns the entire contents of a folder. 
File folder = new File(path);
if (folder.exists()) {
    return folder.listFiles();
return null;
ListgetAllFilesInDirMatchingPattern(String directory, final String regex, final boolean first_match2)
get All Files In Dir Matching Pattern 
File directoryFile = new File(directory);
checkDirectory(directoryFile);
FilenameFilter fileFilter = new FilenameFilter() {
    private boolean matchedyet = false;
    public boolean accept(File dir, String name) {
        if (first_match2 && matchedyet)
            return false;
        else {
...
ListgetAllFilesInFolder(File rootFolder, FileFilter filter, int maxFilesRequired)
Retrieves a List with at most maxFiles files that are in a folder or any of the subfolders in that folder satisfying a condition. 
List<File> finalFiles = new ArrayList<>();
if (!Thread.currentThread().isInterrupted()) {
    if (maxFilesRequired < 0)
        throw new IllegalArgumentException("maxFilesRequired argument less than zero");
    if (rootFolder == null || filter == null)
        throw new IllegalArgumentException("folder or filter null");
    if (!rootFolder.exists() || !rootFolder.isDirectory())
        throw new IllegalArgumentException("rootFolder argument is not a directory");
...