不保留原List进行翻转
List<Integer> list = new ArrayList<>();
list.add(1);
list.add(2);
list.add(3);
System.out.println("翻转前:" + list);
Collections.reverse(list);
System.out.println("反转后:" + list);
List<Integer> list = new ArrayList<>();
list.add(1);
list.add(2);
list.add(3);
System.out.println("翻转前:" + list);
Collections.reverse(list);
System.out.println("反转后:" + list);