// int[]转List
List<Integer> list = Arrays.stream(arr).boxed().collect(Collectors.toList());
//List转int
int[] arr = list.stream().mapToInt(Integer::valueOf).toArray();
// int[]转List
List<Integer> list = Arrays.stream(arr).boxed().collect(Collectors.toList());
//List转int
int[] arr = list.stream().mapToInt(Integer::valueOf).toArray();
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