Number Complement

The complement of an integer is the integer you get when you flip all the 0's to 1's and all the 1's to 0's in its binary representation.

• For example, The integer 5 is "101" in binary and its complement is "010" which is the integer 2.

Given an integer num, return its complement.

LeetCode Problem - 476

class Solution {
    public int findComplement(int num) {
        // Convert the given number to its binary string representation
        String binaryStr = Integer.toBinaryString(num);

        // Use StringBuilder to build the binary complement string
        StringBuilder sb = new StringBuilder();

        // Iterate through each character in the binary string
        for (char ch : binaryStr.toCharArray()) {
            // If the character is '0', append '1' to the StringBuilder
            if (ch == '0') sb.append(1);
            // If the character is '1', append '0' to the StringBuilder
            else sb.append(0);
        }

        // Convert the binary string representation of the complement back to an integer
        int number = Integer.parseInt(sb.toString(), 2);

        // Return the complement as an integer
        return number;
    }
}