Check whether a Number Is a Perfect Number or Not

//A perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself. Equivalently, a perfect number is a number that is half the sum of all of its positive divisors. The first perfect number is 6, because 1, 2 and 3 are its proper positive divisors, and 1 + 2 + 3 = 6. Equivalently, the number 6 is equal to half the sum of all its positive divisors: ( 1 + 2 + 3 + 6 ) / 2 = 6.

public class IsPerfectNumber
 {
public boolean isPerfectNumber(int number)
{
 int temp = 0;
 for(int i=1;i<=number/2;i++)
{
 if(number%i == 0)
{ temp += i; }
 }
 if(temp == number)
{ System.out.println("It is a perfect number");
return true; }
 else
 {
System.out.println("It is not a perfect number");
 return false;
}
 }
 public static void main(String a[])
{
IsPerfectNumber ipn = new IsPerfectNumber()
; System.out.println("Is perfect number: "+ipn.isPerfectNumber(28));
 }
}