I'm trying to dereference a hash key inside an access method and cannot figure out why it's failing. I keep getting this error "Can't use string ("5") as a HASH ref while "strict refs" in use at Music.pm line 19." If I manually assign the value in the method it works and in another method I can print the value using the same syntax. The big picture is that I want to pass one value to the constructor and then use that value along with an access method to populate the second value in the constructor. This is possible when I use the hard coded value in the method.
What concept is it that I am not understanding? 

use strict;
use warnings;

package Music;

sub new {
    my $class = shift;
    my $number1 = @_; 
    my $number2 = &add_numbers;
    my $ref= { "Number_one"      =>    $number1,
               "Number_two"      =>    $number2
               };
               bless($ref, $class);
}

sub add_numbers {
    my $self = shift;
    my $value = $self->{"Number_one"} ;
#    my $value = 2;
    return $value;
};

sub display_values{
    my $self = shift;
    print "$self->{'Number_one'}\n";
    print "$self->{'Number_two'}\n";
}

1;

[download]

This is the line in question from the sub add_numbers method: 

    my $value = $self->{"Number_one"} ;

[download]

Here's my user/driver program: 

use strict;
use warnings;

use Music;

my $value = Music->new(5);
$value->display_values;

[download]

Any clues on what I need to study?

In reply to dereference hash key object in access method by gctaylor1

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