What you want is trivial to do: 
package Logger;
my %instance;

sub instance {
  my $class = shift;
  return $instance{$class} ||= bless {@_}, $class;
}

[download]
As for Java's type system, I am not so convinced it is a win. A few articles for thought, Java is untyped, late binding is good, and strong typing.

In reply to Re (tilly) 5: Ruby: An Abbot breaks silencewind by tilly
in thread Ruby: An Abbot breaks silencewind by coreolyn

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