Program to check whether the number is an Armstrong number in Java

class P16
{
public static void main(String args[])
{
int sum=0,ch,i,j,num,no;


no= 153;
num=no;


do
{
sum=sum+(no%10)*(no%10)*(no%10);
no=no/10;
}
while(no!=0);


if(sum==num)
System.out.println("The number "+num+" is an Armstrong number ");
else
System.out.println("The number "+num+" is not an Armstrong number ");
}
}