Need help java hashMap and ArrayList problems

Java hashMap and ArrayList problems static HashMap Q1(ArrayList inputList){//Return a HashMap containing all the input Strings as keys with values equal to the length of each String return null;} static int Q2(ArrayList> inputList){//Return that sum of all the provided Integers. Note that you are given a ArrayList containing an unknown/umber of ArrayLists of Integers (A Matrix of Integers) return 0;}