initializing a multidimensional list with n empty 1D lists in Java -

i have multi-dimensional list

list<list<integer>> mylist; 

i want dimension specified @ run time, in code, put:

mylist = collections.synchronizedlist(new arraylist<list<integer>>(n)); 

i hoping initialize mylist list n elements each having 0 elements didn't happen. empty list. apparently constructor, "constructs empty list specified initial capacity." not quite want.

i understand can loop on mylist , add() empty one-dimensional lists, there way of achieving want less codes of code?

first of constructor arraylist<t>(int capacity) not insert element in list, not specifying size initial capacity.

basically allow list insert n elements without need of internal resizing.

so outer list still empty. can't use collections.fill because need different internal list<integer> every time, , fill set elements same reference. forced insert them manually:

for (int = 0; < n; ++i)   mylist.add(new arraylist<integer>()); 

mind in case, since specified list<list<integer>> (which makes sense), java wouldn't able default initialize anything, since list<integer> in interface.