java中如何对arrayList按数字大小逆序排序

public static void main(String[] args) {
        Integer[] nums = {1,5,34,6,8,7,33};
        ArrayList<Integer> numberList = new ArrayList<>();
        Collections.addAll(numberList, nums);

        // 排序前
        System.out.println("逆序前 numberList " + numberList);

        // 排序后
        ArrayList<Integer> copyList = new ArrayList<>(numberList);
        Collections.sort(copyList, new Comparator<Integer>() {
            @Override
            public int compare(Integer num1, Integer num2) {
                if (num1 > num2) {
                    return -1;
                } else {
                    return 1;
                }
            }
        });
        System.out.println("逆序后 copyList " + copyList);
        // 原列表不变
        System.out.println("逆序后 numberList " + numberList);
    }

public class ComparatorTest {
    public static void main(String[] args) {
        baseTypeSort();
        referenceTypeSort();

    }

    private static void referenceTypeSort() {
        Person p1 = new Person(10);
        Person p2 = new Person(16);
        Person p3 = new Person(1);
        Person p4 = new Person(8);
        Person p5 = new Person(100);

        List<Person> people = new ArrayList<>();
        people.add(p1);
        people.add(p2);
        people.add(p3);
        people.add(p4);
        people.add(p5);
        System.out.println("排序前：" + people);
        people.sort((o1, o2) -> o2.getAge() - o1.getAge());
        System.out.println("降序：" + people);
        Collections.sort(people, (o1, o2) -> o1.getAge() - o2.getAge());
        System.out.println("升序：" + people);
        people.sort(Comparator.comparing(Person::getAge));
        System.out.println("comparing写法升序：" + people);
        people.sort(Comparator.comparing(Person::getAge).reversed());
        System.out.println("comparing写法降序：" + people);
    }

    private static void baseTypeSort() {
        // 初始化一组数据,这组数据可以是任意对象
        int[] data = {7, 5, 1, 2, 6, 8, 10, 12, 4, 3, 9, 11, 13, 15, 16, 14};
        // 构建成一个集合
        List<Integer> list = new ArrayList<>();
        for (int i = 0; i < data.length; i++) {
            list.add(data[i]);
        }
        System.out.println("排序前：" + list);
        //逆序
        list.sort((o1, o2) -> o2 - o1);
        System.out.println("降序：" + list);
    }
}

(o1, o2) -> o2.getAge() - o1.getAge()