The below code :
List<List<String>> lss = new ArrayList<ArrayList<String>>();
causes this compile time error :
Type mismatch: cannot convert from ArrayList<ArrayList<String>> to List<List<String>>
to fix I change the code to :
List<ArrayList<String>> lss = new ArrayList<ArrayList<String>>();
Why is this error being thrown ? Is this because the generic type List in List<List<String>> is instantiated and since List is an interface this is not possible ?