Cells in a Range on an Excel Sheet LeetCode solution in Java

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class Solution {
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  public List<String> cellsInRange(String s) {
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    char sc = s.charAt(0), ec = s.charAt(3);
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    char sr = s.charAt(1), er = s.charAt(4);
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    List<String> res = new ArrayList<>();
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    for (char i = sc; i <= ec; ++i) {
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      for (char j = sr; j <= er; ++j) {
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        res.add(new String(new char[] {i, j}));
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      }
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    }
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    return res;
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  }
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}