Java Utililty Methods File List from Folder

List of utility methods to do File List from Folder

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Description

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

Method

HashSetgetFilesFromFolder(String folder, String mustHave, String doesntMustHave, boolean isPrevious)
Gets the files from folder. 
HashSet<String> result = new HashSet<String>();
File dir = new File(folder);
HashSet<String> files = new HashSet<String>();
findAllFiles(dir, files, mustHave, doesntMustHave, isPrevious);
result.addAll(files);
return result;
voidgetFilesFromFolder(String folderPath, ArrayList files)
get Files From Folder 
File folder = new File(folderPath);
File[] fList = folder.listFiles();
if (fList != null) {
    for (File file : fList) {
        if (file.isFile()) {
            files.add(file);
        } else if (file.isDirectory()) {
            getFilesFromFolder(file.getAbsolutePath(), files);
...
ListgetFilesFromFolder(String folderPath, boolean withAbsolPath)
get Files From Folder 
File folder = new File(folderPath);
List<String> toRet = new ArrayList<>();
String[] allFiles = folder.list();
if (withAbsolPath) {
    for (String file : allFiles) {
        toRet.add(folderPath + File.separator + file);
} else
...