Baidu interview question - judge whether a positive integer is to the power of K of 2

The code is as follows ：

import java.util.Scanner;
public class test{
    // Determine whether a positive integer is 2 Of K Power 
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        int input = scanner.nextInt();
        if((input & (input - 1)) == 0){
            System.out.println("Yes!");
        }
        else{
            System.out.println("No!");
        }
    }
}

analysis ：