Оператори и Изрази 10

import org.omg.CORBA.MARSHAL;
import org.omg.Messaging.SYNC_WITH_TRANSPORT;

import java.lang.reflect.Array;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner=new Scanner (System.in);

        int number=Integer.parseInt(scanner.nextLine());
        int copyNumber=number;

        int sum=0;
        while (number!=0){

            int digit=number%10;
            number=number/10;
            sum=sum+digit;
        }
        System.out.println(sum);
        number=copyNumber;

        while (number!=0){

            int digit=number%10;
            number=number/10;
            System.out.print(digit);
        }
        System.out.println();

        number=copyNumber;
        String stringNum= Integer.toString(number);
        char firstDigit=stringNum.charAt(0);
        char lastDigit=stringNum.charAt(stringNum.length()-1);

        char [] numbers = stringNum.toCharArray();

        Array.setChar(numbers,stringNum.length()-1,firstDigit);
        Array.setChar(numbers,0,lastDigit);

        char thirdDigit=stringNum.charAt(2);
        char SecondDigit=stringNum.charAt(1);



        System.out.println(numbers);


        Array.setChar(numbers,2,SecondDigit);
        Array.setChar(numbers,1,thirdDigit);
        System.out.println(numbers);

    }
}