How can i use Comparator while using an Iterator (Java)

I have a class called book that has a method that returns a comparator

public Comparator sortByYear() { return new Comparator() { @Override public int compare(Book o1, Book o2) { if(o1.getDate().getYear() > o2.getDate().getYear()) return 1; else if(o1.getDate().getYear() < o2.getDate().getYear()) return -1; else return 0; } }; }

in my driver, im trying to iterate through my list, but I need to use the comparator to sort them. How can I do this without using Collections.sort() or Arrays.sort()?