Power of Four

这个不错，红红火火恍恍惚惚哼哼哈嘿

public class Solution {
    public boolean isPowerOfFour(int num) {
        int count1 = 0;
        int count0 = 0;
        while (num > 0) {
            count1 += num & 1;
            count0 += num ^ 1;
            num >>= 1;
        }
        if (count1 == 1 && count0 % 2 == 0) {
            return true;
        } else {
            return false;
        }
    }
}