You could really make some use of documentation. First thing probably you'd find would be that it is the AS3 language you are programming in, and not Java. :) Another probably discouraging discovery would be that List class you are referring to is maybe just some UI component from Flex framework, and it has nothing to do with collections ;) AS3 doesn't have List collection type, if you need one you'd write it yourself.
Best. Oleg
