Java--Calculate perfect number

 Perfect number : is a positive integers which is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself

(or)

Perfect number : is a positive integers which is equal to the sum of its proper positive factors, that is, the sum of its positive factors excluding the number itself

For example 

 6 has factors 1,2,3 and 6(number itself)

         import java.util.*;

class perfect{ public static void main(String args[]) { int n,sum=0; System.out.println("Enter a number: ");    Scanner obj=new Scanner(System.in); n=obj.nextInt();    for(int i=1;i<n;i++)        {        if(n%i==0)          sum+=i;        }    if(n==sum)        System.out.println(n+" is a Perfect number");    else        System.out.println(n+" is not Perfect number");     }
}