Java program to find perfect number or not.

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));

    }

}

Output:

28 It is a perfect number Is perfect number: true