java array to list

public static void main(String[] args) {
        int[] nums = {3, 5, 1, 2, 9};

        System.out.println(Arrays.asList(nums).size());


    }

结果为1

//it is because you can't have a List of a primitive type. In other words, List<int> is not possible. You can, however, have a List<Integer>.

Integer[] spam = new Integer[] { 1, 2, 3 };
Arrays.asList(spam);

//没有list<int> 这玩意，可以用list<Integer>

int[] nums = {3, 5, 1, 2, 9};
List<Integer> list = Arrays.stream(nums).boxed().collect(Collectors.toList());