"Classname"->method( $arg); 
method "Classname" $arg; 
method( "Classname", $arg);

##</code><code>##

#!/usr/bin/perl -w
use strict;

package Base;
sub base {
    print "Base::base called\n";
}


package Derived;
use vars qw( @ISA);
@ISA = ( "Base");


package main;

Derived::base Derived "hello";
Derived::base( Derived,"hello");   #  undefined
Derived::base "Derived" "hello";   # syntax error