public interface Name {
    String shortName();
    String fullName();
}

String fullName() - return full name.

String shortName() - return short name.

NameFolderRoot - implementation for root name folder.

NameFoldersPath - implementation for folder path from folder names.

NamePure - implementation for filename with clearing bad chars.

NameSystemDriveWin - implementation for name of Windows system drive.

Folder<T> - interface of folder.

Name exists, because all operations about files and folders do not occur without the participation of their name.