Leetcode: Power of Two

Given an integer, write a function to determine if it is a power of two.

 1 public class Solution {
 2     public boolean isPowerOfTwo(int n) {
 3         boolean one = false;
 4         for (int i=0; i<32; i++) {
 5             if (((n>>i) & 1) == 1) {
 6                 if (i == 31) return false;
 7                 if (!one) one = true;
 8                 else return false;
 9             }
10         }
11         return one;
12     }
13 }