Largest 3-Same-Digit Number in String LeetCode solution in Java

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class Solution {
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  public String largestGoodInteger(String num) {
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    String ans = "";
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    for (int i = 2; i < num.length(); i++)
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      if (num.charAt(i) == num.charAt(i - 1) && num.charAt(i - 1) == num.charAt(i - 2))
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        if (num.substring(i - 2, i + 1).compareTo(ans) > 0) // Check if the new one is larger
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        ans = num.substring(i - 2, i + 1);
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    return ans;
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  }
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}