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

voidgetAllFilesRecursively(File directory, Collection files)
Helper for getAllSubdirectories(directory). 
for (File file : directory.listFiles()) {
    if (file.isDirectory()) {
        getAllFilesRecursively(file, files);
    } else {
        files.add(file);
File[]getAllFilesWithExtension(String directory, final String extension)
get All Files With Extension 
return getAllFilesWithExtension(new File(directory), extension);
IterablegetAllFilesWithExtension(String folderPath, String extension)
get All Files With Extension 
File folder = new File(folderPath);
File[] files = folder.listFiles();
if (files == null) {
    return new ArrayList<>();
return Arrays.asList(files).stream()
        .filter(file -> file.isFile() && file.getName().toLowerCase().endsWith(extension.toLowerCase()))
        .collect(Collectors.toList());
...
String[]getAllFilesWithFilter(String DirectoryName, FilenameFilter Filter)
{ method 
File TestFile = new File(DirectoryName);
return (getAllFilesWithFilter(TestFile, Filter));