Maximum 69 Number LeetCode solution in Java

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class Solution {
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  public int maximum69Number(int num) {
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    int i;
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    String s = String.valueOf(num);
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    int l = s.length();
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    int max = num;
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    for (i = 0; i < l; i++) {
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      char c[] = s.toCharArray();
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      if (c[i] == '9') {
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        c[i] = '6';
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      } else {
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        c[i] = '9';
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      }
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      String p = new String(c);
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      int k = Integer.parseInt(p);
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      max = Math.max(max, k);
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    }
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    return max;
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  }
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}