Hi Monks,

I am trying to learn a OO programming in perl. I have writtten following code to learn inheritance. 

{
    package Animal;
    sub new
    {
        my $class = shift;
        my $name = shift;
        bless \$name, $class;
    }

    sub name 
    {
        my $self = shift;
        ref $self ? $$self : "an unnamed $self";
    }

    sub speak 
    {
        my $class = shift;
        print "a $$class goes ", $class->sound, "!\n";
    }

    sub eat 
    {
        my $self = shift;
        my $food = shift;
        print $self->name, " eats $food.\n";
    }
    
}

{
    package Horse;
    @ISA = qw (Animal);
    sub sound {"neigh"};

}

{
    package Sheep;
    @ISA = qw (Animal);
    sub sound {"blahhhhhhhh"};
}

my $horse1 = Horse->new("H1");
$horse1->speak;
print "Horse sounds ", Horse->sound, "\n";
$horse1->eat("hay");
Sheep->eat("grass");
Sheep->speak;

[download]
In the above code every methods present in Animal can be accessed by Horse or Sheep object. But if I want to add a private method to Animal class, how can I implement this? I tried to find out on Net and found out there are modules present public, private, but if I want to implement without using those modules, how can I implement this feature?
Thanks in advance
-Pijush

In reply to How can I add private data/methods in parent class? by pijush

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