int[] 与 integer[] 相互转换

int[] 与 integer[] 相互转换

class Solution {public int[] sortByBits(int[] arr) {Integer[] integerArray = Arrays.stream(arr).boxed().toArray(Integer[]::new);Arrays.sort(integerArray, new Comparator<Integer>() {@Overridepublic int compare(Integer o1, Integer o2) {int count1 = Integer.bitCount(o1);int count2 = Integer.bitCount(o2);if (count1 != count2) {return count1 - count2;}return o1.compareTo(o2);}});return Arrays.stream(integerArray).mapToInt(Integer::intValue).toArray();}
}