title: Try catch is causing an infinite loop(input.mismatch.Exception)
body: <p>I am trying to make a simple calculator program. However, I am also trying to make it so that if the user enters in something that is not a double, it will ask again for a double. However, when I try to enter in something like "e" for a double, it gave me an input.mismatch.exception. I put in a try catch block, and all that does is infinitely asks for input without giving a chance to put input, then errors out because it overloads the RAM giving me a stackoverflow (nice) error.
  code:</p>
  
  <pre><code>/**
   * @author camper
   * Jul 1, 2019
   * 3:28:04 PM
   */
  import java.util.Scanner;
  
  public class io2 {
  
      static double num1;
      static String op;
      static double num2;
  
      public static Scanner input = new Scanner(System.in);
  
      public static void main(String[] args) {
          doStuff();
  
      }
  
      public static void doStuff() {
  
          getNum1();
          getOp();
          getNum2();
  
          calc(num1, op, num2);
      }
  
      public static void calc(double a, String c, double b) {
  
          if (c.equals("+")) {
              System.out.println(a + b);
          } else if (c.equals("-")) {
              System.out.println(a - b);
          } else if (c.equals("*")) {
              System.out.println(a * b);
          } else if (c.equals("/")) {
              System.out.println(a / b);
          } else {
              System.out.println("That ain't no operator");
              doStuff();
          }
      }
  
  
  
      public static void getNum1() {
          try {
              System.out.println("Enter your first number:");
              num1 = input.nextDouble();
  
          }catch (Exception e) {
              getNum1();
          }
      }
  
      public static void getOp() {
          System.out.println("Enter what operator you want (+,-,*,/):");
          op = input.nextLine();
      }
  
      public static void getNum2() {
          System.out.println("Enter your second number:");
          num2 = input.nextDouble();
  
      }
  </code></pre>
  
  <p>}</p>