Zig-Zag Arrays

import java.util.Scanner;
import java.util.Arrays;

public class SoftUni {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String line1 = "";
        String line2 = "";
        System.out.print("Enter the number of lines here: ");
        int lines = Integer.parseInt(sc.nextLine());
        for(int i = 0;i<lines;i++){
            String[] line = sc.nextLine().split(" ");
            int[] arr = Arrays.stream(line).mapToInt(e -> Integer.parseInt(e)).toArray();
            if(i % 2 == 0){
                line1 += arr[0] + " ";
                line2 += arr[1] + " ";
            }
            else{
                line1 += arr[1] + " ";
                line2 += arr[0] + " ";
            }

        }

        System.out.println(line1);
        System.out.println(line2);
    }

}