231. Power of Two java solutions

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

Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

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public class Solution {
    public boolean isPowerOfTwo(int n) {
        if(n < 1 ) return false;
        return (n&(n-1)) == 0;
    }
}