Java Calculator

import java.util.Scanner;

public class Calculator {
  public static void main(String[] args) {
    try(Scanner a = new Scanner(System.in)) {
      //Variables
      String e = "";   //Store input text for math type
      int b = 1;      //Store input for number 1
      int c = 1;      //Store input for number 2

      //Get input for math type
      System.out.print("Type: ");
      e = a.nextLine();

      //Get input for number 1
      System.out.print("Num1: ");
      b = a.nextInt();

      //Get input for number 2
      System.out.print("Num2: ");
      c = a.nextInt();

      int[] d = {     //Do math
        b+c,          //Add
        b-c,          //Subtract
        b*c,          //Multiply
        b/c           //Divide
      };

      //Decide what to do with input
      switch(e.toLowerCase()) {
      //Addition
        case "1":
        case "a":
        case "add":
        case "addition":
        case "+":
          System.out.println("\nAddition: "+d[0]);
          break;
      //Subtraction
        case "2":
        case "s":
        case "sub":
        case "subtract":
        case "subtraction":
        case "-":
          System.out.println("\nSubtraction: "+d[1]);
          break;
      //Mutliplication
        case "3":
        case "m":
        case "multi":
        case "multiply":
        case "multiplication":
        case "*":
        case "x":
          System.out.println("\nMutliplication: "+d[2]);
          break;
      //Division
        case "4":
        case "d":
        case "div":
        case "divide":
        case "division":
        case "/":
          System.out.println("\nDivision: "+d[3]);
          break;
      //All
        case "5":
        case "all":
          System.out.println("\nAddition: "+d[0]
            +"\nSubtraction: "+d[1]
            +"\nMultiplication: "+d[2]
            +"\nDivision: "+d[3]);
          break;
        default:
          System.out.println("Invalid Type."
            +"\nValid Types: "
            +"\n1, a, add, addition, +"
            +"\n2, s, sub, subtract, subtraction, -"
            +"\n3, m, multi, multiply, multiplication, *"
            +"\n4, d, div, divide, division, /"
            +"\n5, all");
          main(args);
          break;
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}