Add to Array-Form of Integer LeetCode solution in Java

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class Solution {
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  public List<Integer> addToArrayForm(int[] num, int k) {
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    List<Integer> res = new ArrayList<>();
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    int i = num.length;
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    while (--i >= 0 || k > 0) {
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      if (i >= 0) k += num[i];
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      res.add(k % 10);
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      k /= 10;
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    }
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    Collections.reverse(res);
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    return res;
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  }
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}