Dispaly the sum of all perfect number within 1 to 1000 in java

class PerfectSum
{
    public static void main(String[] args)
    {
        int i, j, end, sum,sum1=0;

   
    System.out.println("Sum Of All Perfect numbers between 1 to 1000\n");
    
    for(i=1; i<=1000; i++)
    {
        sum = 0;

       for(j=1; j<i; j++)
        {
            if(i % j == 0)
            {
                sum += j;
            }
        }
      
        if(sum == i)
        {
            System.out.println(" "+i);
            sum1=sum1+i;
        }
    }
    System.out.print(" Sum Of All Perfect No. is: "+sum1);
    }
}