simple calculator

//calculator program, will add, subtract, multiply, and maybe divide (nope i didn't make that part)
import java.util.Scanner;
class Main
{
  public static void main(String args[])
  {
    System.out.println("what would you like to do? \n1: add\n2: subtract\n3: multiply");
    Scanner reader = new Scanner(System.in);
    byte operationType = reader.nextByte();
    if (operationType == 1)
    {
      Calculations.add();
    }
    else if (operationType == 2)
    {
      Calculations.subtract();
    }
    else if (operationType == 3)
    {
      Calculations.multiply();
    }
  }
}

class Calculations
{
  static void add()
  {
    Scanner reader2 = new Scanner(System.in);
    int x = reader2.nextInt();
    int y = reader2.nextInt();
    int answer = x + y;
    System.out.println(x
                         + " + "
                         + y
                         + " = "
                         + answer);
  }
  static void subtract()
  {
    Scanner reader2 = new Scanner(System.in);
    int x = reader2.nextInt();
    int y = reader2.nextInt();
    int answer = x - y;
    System.out.println(x
                      + " - "
                      + y
                      + " = "
                      + answer);
  }
  static void multiply()
  {
    Scanner reader2 = new Scanner(System.in);
    int x = reader2.nextInt();
    int y = reader2.nextInt();
    int answer = x * y;
    System.out.println(x
                      + " * "
                      + y
                      + " = "
                      + answer);
  }
}