SearchByExt<T> - search by file extension.

public SearchByExt(Search<T, String> search)


Search<T, String> find - search by files.

List<String> rootFiles = new ArrayList<>();
rootFiles.add("root1.png");
rootFiles.add("root2.pdf");
rootFiles.add("root3.txt");
rootFiles.add("root4.pdf");
rootFiles.add("root5.txt");

Folder<String> root = new FolderPure<>(
        new NameFolderRoot(),
        rootFiles);

Search<List<String>, String> search = new SearchByExt<>(
        new SearchFilesByRegex(root, false));
List<String> files = search.answer(".txt");
files.forEach(System.out::println);