Thanks for your reply. I tried this but i found an error saying...
"Bound mismatch: The generic method min(Collection<? extends T>) of type Collections is not applicable for the arguments (ArrayList<ArrayList>). The inferred
type ArrayList is not a valid substitute for the bounded parameter <T extends Object & Comparable<? super T>>"
Actually i have 3 arraylist in 1 arraylist. Now i need to find the max of the the 3 arraylist separately.