Complement of Base 10 Integer LeetCode solution in Java

1
class Solution {
2
  public int bitwiseComplement(int n) {
3
    String bin = Integer.toBinaryString(n);
4
    String res = "";
5
    for (char c : bin.toCharArray()) {
6
      if (c == '1') res += "0";
7
      else res += "1";
8
    }
9
    return Integer.parseInt(res, 2);
10
  }
11
}