Flip String to Monotone Increasing LeetCode solution in Java

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class Solution {
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  public int minFlipsMonoIncr(String s) {
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    int n = s.length();
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    int zeroToOne = 0;
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    int countOfOnes = 0;
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    for (int i = 0; i < n; i++) {
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      if (s.charAt(i) == '0') zeroToOne = Math.min(zeroToOne + 1, countOfOnes);
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      else countOfOnes = countOfOnes + 1;
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    }
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    return zeroToOne;
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  }
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}