### Hauptprogramm ### #!/usr/bin/perl use strict; use lib './classes'; use builder; my $builder; $builder = builder->new("Author"); $builder->print(); ### Package ### package builder; use strict; sub new {    my ($class, $author) = @_;    my $self = { _author => $author };    return bless($self, $class); } sub print {    my ($self) = @_;    print $self->{_author}."\n"; } 1;