Two‘s complement of integer:
https://zh.wikipedia.org/wiki/%E4%BA%8C%E8%A3%9C%E6%95%B8
Bit Manipulation:
https://docs.oracle.com/javase/tutorial/java/nutsandbolts/op3.html
代码：
public class Solution {
public boolean isPowerOfTwo(int n) {
int count = 0;
if((n & Integer.MIN_VALUE) != 0){
//n = ~n + 1;
return false;
}
for(int i = 32; i > 0; i--){
count += n & 1;
n = n>>1;
}
return count == 1;
}
}
Jan 12 - Power of Two; Integer; Bit Manipulation;
原文：http://www.cnblogs.com/5683yue/p/5126123.html