Maximum Binary String After Change LeetCode solution in Java

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class Solution {
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  public String maximumBinaryString(String binary) {
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    int n = binary.length();
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    StringBuffer ans = new StringBuffer("");
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    StringBuffer buffer = new StringBuffer("");
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    int onesAfter1stZero = 0;
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    boolean found1stZero = false;
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    for (int i = 0; i < n; i++) {
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      if (found1stZero) {
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        if (binary.charAt(i) == '0') ans.append('1');
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        else buffer.append('1');
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      } else {
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        if (binary.charAt(i) == '0') {
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          found1stZero = true;
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          buffer.append('0');
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        } else ans.append('1');
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      }
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    }
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    ans.append(buffer);
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    return ans.toString();
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  }
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}