In reply to Liiiiiz:
package my_package;
class my_class #(int my_parameter);
function int get_parameter;
return my_parameter;
endfunction
endclass
endpackage
module top;
import my_package::*;
my_class#(1) c1=new;
my_class#(2) c2=new;
initial begin
$display(c1.get_parameter);
$display(c2.get_parameter);
end
endmodule