The Hamming distance between two integers is the number of positions at which the corresponding bits are different.

Given two integers x and y, calculate the Hamming distance.

Note:
0 ≤ x, y < 231.

Example:

Input: x = 1, y = 4

Output: 2

Explanation:
1   (0 0 0 1)
4   (0 1 0 0)
       ↑   ↑

The above arrows point to positions where the corresponding bits are different.

public class Solution {
    public int hammingDistance(int x, int y) {
        int z=x^y;
        int count=0;
        while(z!=0){
            count++;
            z&=z-1;
        }
        return count;
    }
}

异或变形

leetcode_461 Hamming Distance