I need help with 11.14 Combine 2 lists in introduction to Java programming and data structures. I havent had any luck creaating it effectivly.

Maximum element in ArrayList) Write the following method that returms e maximum value in an ArrayList of integers. The method returns null ir te list is nu11 or the list size is 0 public static Integer max (ArrayList Integer> 1ist) Write a test program that prompts the user to enter a sequence of numbers ending with 0 and invokes this method to return the largest number in the input