hi monks, i got 2 problems on passing variables between them

1. i try to pass a string "problem1" to a class, but it result "packa=HASH(0x1b0effc)" when I pass the value to the class, what i am not expected. 

$string = $obj->pass("problem1");

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2. I have a array inside a hash, mm when i pass the array back into main.pl, how to get value? 
if ($key eq "problem2"){
        foreach (@ha{$key}){
            print "array : @{$_}\n";

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full code here
#in  main.pl
use packa;
$obj = packa->new;
$string = $obj->pass("problem1");
#print $string;
%ha = $obj -> passhash;
foreach $key (keys (%ha)){
    if ($key eq "problem2"){
        foreach (@ha{$key}){
            print "array : @{$_}\n";
        }
    }
}

#in packa.pm
package packa;
sub new{
    my $class = shift;
    my $self = {};
    bless($self);
    return $self;
}

sub pass{
    my ( $problem1 )= @_;
    print "$problem1\n";
}
sub passhash{
%hash = qw {
    dog voa
    cat mice
};
$hash {'problem2'} = [["ha" , "thing", "thorw"], 
             ["good", "ssa" , "ham"],
             ["as", "kid", "wo"],
             ];

return %hash;

}
1;

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In reply to two problems about passing var between classes by benlaw

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