Question

Can anyone suggest a FileSet package/class in Java. By FileSet I mean a collection of files and directories together with regex-powered inclusion and exclusion rules (similar to Apache Ant). Thanks.

Answer 1

You could make use of File#listFiles() wherein you pass a FileFilter or FilenameFilter where in turn you can specify the desired pattern in the accept() method.

E.g.

File[] txtFiles = file.listFiles(new FilenameFilter() {
    @Override public boolean accept(File dir, String name) {
        return name.endsWith(".txt"); // You can use String#matches() as well.
    }
});