Check if All A's Appears Before All B's LeetCode solution in Java

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class Solution {
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  public boolean checkString(String s) {
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    for (int i = 0; i < s.length(); i++) {
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      if (s.charAt(i) == 'b') {
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        for (int j = i + 1; j < s.length(); j++) {
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          if (s.charAt(j) == 'a') {
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            return false;
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          }
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        }
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      }
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    }
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    return true;
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  }
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}