如何使用Collections.reverse对list集合进行降序排序

import java.util.*;
public class Test {
  private static Map<Integer, String> map = new HashMap<Integer, String>();
  public static void main(String[] args) {
    long[] data = {1506326821000l, 1506327060000l, 1506326880000l, 1506327000000l, 1506326940000l, 1506326760000l, 1506326700000l};
    List list = new ArrayList<>();
    for (long key : data) {
      list.add(key);
    }
    System.out.println(list);
    //先升序
    Collections.sort(list);
    System.out.println(list);
    //再反转
    Collections.reverse(list);
    System.out.println(list);
  }
}

    public static void reverse(List<?> list) {
        int size = list.size();
  //REVERSE_THRESHOLD  =18 数据倒叙大小限制
        if (size < REVERSE_THRESHOLD || list instanceof RandomAccess) {
        //折半处理，前后交换
        //size>>1 相等于 size/2  
  for (int i=0, mid=size>>1, j=size-1; i<mid; i++, j--){
            swap(list, i, j);
        }
               
        } else {
            ListIterator fwd = list.listIterator();
            ListIterator rev = list.listIterator(size);
            for (int i=0, mid=list.size()>>1; i<mid; i++) {
                Object tmp = fwd.next();
                fwd.set(rev.previous());
                rev.set(tmp);
            }
        }
    }

public static void swap(List<?> list, int i, int j) {
        final List l = list;
        //l.set(j, l.get(i)) 获取原来的数据
  l.set(i, l.set(j, l.get(i)));
    }  
 
 public ListIterator<E> listIterator(int index) {
        if (index < 0 || index > size)
            throw new IndexOutOfBoundsException("Index: "+index);
        return new ListItr(index);
    }
 
 public E set(int index, E element) {
        rangeCheck(index); 
        E oldValue = elementData(index);
        elementData[index] = element;
        return oldValue;
    }