What is wrong with the following code?

List $1=$ new ArrayList$()$;

List $12=$ new ArrayList$()$;

l$.$add$("$Hello$")$;

l$.$add$("$World$")$;

Collections.copy$(12,$ I$)$;

I$2$ is not the same size as I

There is nothing wrong with this code

$12$ holds strings and $11$ holds ints

I is a List and I$2$ is an ArrayList

Question $3$