Convert Integer A to Integer B

1. A代表的二进制数转为B代表的二进制数，编辑距离是多少，

 public static int bitSwapRequired(int a, int b) {
				int count = 0;
				int a_xor_b = a ^ b;
				while (a_xor_b != 0) {
				++count;
				a_xor_b &= (a_xor_b - 1);
		} 
		return count;
		}