```
int[] nums = new int[]{4, 3, 9};
Integer[] numsObj = new Integer[nums.length];
for (int i = 0; i < nums.length; i++) {
numsObj[i] = nums[i];
}
//Arrays.sort(numsObj, Collections.reverseOrder());
//Arrays.sort(numsObj, new Comparator<Integer>(){
// @Override
// public int compare(Integer a, Integer b){
// return b - a;
// }
//});
Arrays.sort(numsObj, (o1, o2)->(o2 - o1));
Object a = numsObj;
```
