1. Collections.sort(people,Comparator.comparing(Person::getLastName));

2.        Collections.sort(list,
                Comparator.comparing( i -> -grow[i])
                          .thenComparing( i -> -plant[i]));

3.        Collections.sort(list,
                Comparator.comparing( (Integer i) -> -grow[i])
                          .thenComparing( i -> -plant[i]));

4.        Collections.sort(list,
                Comparator.comparing( i -> -grow[(int)i])
                          .thenComparing( i -> -plant[(int)i]));