Program to check whether given number is Perfect or not in Java

Before proceeding to our program code, we must see what is perfect number.
What is perfect number?
In number theory, a perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. For instance, 6 has divisors 1, 2 and 3 (excluding itself), and 1 + 2 + 3 = 6, so 6 is a perfect number. Illustration of the perfect number status of the number 6.
Code
// Program to check whether the given number is PERFECT or NOT.
// Logic (like 6 and 28) (1 + 2 + 3 + 6) = (2*6)
class  PerfectTest
{
public static void main( String args[ ] )
{
 int  i, t, n, sum;
 n = 28;
 sum = 0;
 for( i=1 ; i<=n/2 ; i++ )
 {
  if( n % i == 0 )
  {
   sum = sum + i;
  }
 }

 if( n == sum )
  System.out.println( "\n The Number " + n + " is a PERFECT Number." );
 else
  System.out.println( "\n The Number " + n + " is NOT a PERFECT Number." );
}
}

Output:
The Number 28 is a PERFECT Number.