Java code to check whether a number is power of two

import java.util.Scanner;

public class CheckPowerTwo {
   
     
    public static void main(String args[])
    {
    Scanner ob= new Scanner(System.in);
    int a,i;
    System.out.println("Enter an integer");
    a=ob.nextInt();
   
    for( i=0;i<a;i++)
    {
    if(a==Math.pow(2,i))
    { System.out.println("The number is power of two");break;
    }
   
    }
    if(i==a)
        System.out.println("The number is not power of two");
   
   
    }
   
}