1、int[]转List
int[] datas = {1, 2, 3};
List<Integer> lists = Arrays.stream(datas).boxed().collect(Collectors.toList());
2、List排序
倒序
List<Integer> lists = Arrays.asList(4,5,3,2,1);
Collections.sort(lists, (a,b) -> b - a);
正序
List<Integer> lists = Arrays.asList(4,5,3,2,1);
Collections.sort(lists);
