SearchDuplicatesByList<T> - search duplicates from list of files.

No constructors.

List<String> filesWithDuplicates = new ArrayList<String>() {{
    add("/music/opus/opus111.mp3");
    add("/music/opus/opus109.mp3");
    add("/music/opus/opus111.mp3");
}};

Search<List<String>, List<String> search = new SearchDuplicatesByList<>();

List<String> files = search.answer(list);
files.forEach(System.out::println);