Swapping of Numbers with and without Temporary Variable using Java

import java.util.Scanner;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
class Swapping {
    public static void main(String args[]) throws Exception {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(System. in ));
            System.out.println("1-Swapping with temp variable");
            System.out.println("2-Swapping without temp variable");
            System.out.println();
            System.out.print("Select any option: ");
            int select = Integer.parseInt(br.readLine());
            switch (select) {
                case 1:
                    int x, y, temp;
                    System.out.print("Enter x and y: ");
                    Scanner input = new Scanner(System. in );
                    x = input.nextInt();
                    y = input.nextInt();
                    System.out.println("Before Swapping\nx = " + x + "\ny = " + y);
                    temp = x;
                    x = y;
                    y = temp;
                    System.out.println("After Swapping\nx = " + x + "\ny = " + y);
                    break;
                case 2:
                    int a, b;
                    System.out.print("Enter x and y: ");
                    Scanner in = new Scanner(System. in );
                    a = in .nextInt();
                    b = in .nextInt();
                    System.out.println("Before Swapping\nx = " + a + "\ny = " + b);
                    a = a + b;
                    b = a - b;
                    a = a - b;
                    System.out.println("After Swapping\nx = " + a + "\ny = " + b);
                    break;
                default:
                    System.out.println("Wrong choice");
            }
        } catch (IOException e) {
            System.out.println("main method:" + e);
        }
    }
}