I have implemented a class called cell and trying to store a char to it. I find that there is a problem to retrieve the char with my setter and getter.

#This is the detail of the class:      
package Cell;
sub new{
  my $class = shift;
  my $self = {  
    content => -1,
  };
  return bless $self, $class;
}

#This is my setter and getter  
sub setContent{
  my ($self,$ch) = @_;
  $self->{content} = $ch;
  print("stored char".$self->{content}."\n");
} 

sub getContent{
  my $self = @_;
  print("passing back char".$self->{content}."\n");
  return $self->{content};  
} 

# this is the way i used the class
my $ch = "a";
my $cell = Cell->new();
$cell->setContent($ch);     
my $testvar = $cell->getContent();
print("test start\n".$testvar);
print("test end\n");
#
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I find that I am able to pass the char to the setter and should be stored in $self->{content}, but when trying to retrieve char using getter, $self->{content} become empty