Delete Characters to Make Fancy String LeetCode solution in Java

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class Solution {
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  public String makeFancyString(String s) {
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    char prev = s.charAt(0);
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    int freq = 1;
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    StringBuilder res = new StringBuilder();
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    res.append(s.charAt(0));
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    for (int i = 1; i < s.length(); i++) {
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      if (s.charAt(i) == prev) freq++;
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      else {
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        prev = s.charAt(i);
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        freq = 1;
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      }
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      if (freq < 3) res.append(s.charAt(i));
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    }
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    return res.toString();
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  }
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}