Find if a number is a power of 2 or not

 import java.util.*;

public class powerof2 {

    public static void power(int n) {

        if ((n & n - 1) == 0) {

            System.out.println("the number is a power of 2");

        } else {

            System.out.println("the number is not  a power of 2");

        }

    }

    public static void main(String[] args) {

        System.out.println("Enter n:");

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        power(n);

    }

}