package MyObject;
use IO::Socket::INET;
@ISA = ("IO::Socket::INET");
sub peerhostport {
    my $self=shift;
    my $peerport=$self->peerport;
    my $peerhost=$self->peerhost;
    return "$peerhost:$peerport";
}
1;
package main;
my $foo=MyObject->new(PeerAddr => 'www.perlmonks.org',
                      PeerPort => '80',
                      Proto    => 'tcp');
my $string=$foo->peerhostport();
print "string is [$string]\n";