swao two variables

package com.company;

import java.util.Scanner;

public class TrainingCodes2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int a = Integer.parseInt(scanner.nextLine());
        int b = Integer.parseInt(scanner.nextLine());
        int tmp = a;
        if (a > b){
            System.out.println(a = b);
            System.out.println(b = tmp);
        }else{
            System.out.println("error");
        }


    }
}