Talking Calculator Source Code (V2)

import java.util.Scanner;

public class TalkingCalculatorV2 {
    String userInput;
    String userName;

    Scanner myScanner = new Scanner(System.in);

    public static void main(String [] args) {
      TalkingCalculatorV2 calculator = new TalkingCalculatorV2();
      calculator.start();
    }



    public void start() {
      System.out.println("Hello, what is your name?");

      userInput = myScanner.next();
      userName = userInput;

      if(userName.equalsIgnoreCase("graystriped")) {
          System.out.println("OMG! You coded me!!!!!!!!!!!!! Welcome Mr. Coder!");
      }
      else {
          System.out.println(userName + ". That's a cool name!");
      }

      System.out.println("Do you want to do some math? Or just talk?");

      userInput = myScanner.next();

      if(userInput.equalsIgnoreCase("math")) {
        calculate();
      }

      else if(userInput.equalsIgnoreCase("talk")) {
        talk();
      }

      else {
        System.out.println("Hey " + userName + ". Why are you not answering me correctly? " + userInput + " doesn't answer my question!");


        whatNext();
      }
    }



    public void calculate() {
      double firstNum = 0;
      double secondNum = 0;


      System.out.println("Do you want to add, subtract, multiply, or divide?");

      userInput = myScanner.next();


      if(!userInput.equalsIgnoreCase("add") && !userInput.equalsIgnoreCase("subtract") && !userInput.equalsIgnoreCase("multiply") && !userInput.equalsIgnoreCase("divide")) {
        System.out.println(userInput + " doesn't answer my question. Be careful " + userName);

        calculate();
      }

      System.out.println("What do you want to " + userInput + "?");;


      System.out.print("First number: ");

      if(myScanner.hasNextDouble()) {
        firstNum = myScanner.nextDouble();

      }


      else {
        System.out.println(userName + ", do you hate me? If I didn't catch that it could've killed me! " + myScanner.next() + " is not a number!");


        calculate();

        }


      System.out.println("\nGreat!");

      System.out.print("Now for the second number: ");



      if(myScanner.hasNextDouble()) {
        secondNum = myScanner.nextDouble();
      }

      else {
        System.out.println(userName + ", do you hate me? If I didn't catch that it could've killed me!" + myScanner.next() + " is not a number!");;

        calculate();
      }


      System.out.println("\n");


      if(userInput.equalsIgnoreCase("add")) {
        double answer = firstNum + secondNum;
        System.out.println("Here is your answer: " + answer);

      }


      else if(userInput.equalsIgnoreCase("subtract")) {
        double answer = firstNum - secondNum;
        System.out.println("Here is your answer: " + answer);

      }

      else if(userInput.equalsIgnoreCase("multiply")) {
          double answer = firstNum * secondNum;
        System.out.println("Here is your answer: " + answer);
      }

      else if(userInput.equalsIgnoreCase("divide")) {
          double answer = firstNum / secondNum;
        System.out.println("Here is your answer: " + answer);

      }

      whatNext();
    }



    public void talk() {
      System.out.println("So, what is your favorite color?");

      userInput = myScanner.next();


      if(userInput.equalsIgnoreCase("green")) {
        System.out.println("Really? Cool! Me too!");
      }

      else {
        System.out.println(userInput + "? My favorite color is better! My favorite color is green!");
      }

      System.out.println("What is your favorite animal?");

      userInput = myScanner.next();


      if(userInput.equalsIgnoreCase("shark")) {
        System.out.println("Cool! Me too!");


      }

      else if(userInput.equalsIgnoreCase("fish")) {
        System.out.println("Fish are cool too, they're related to my favorite animal, the shark.");
      }

      else if(userInput.equalsIgnoreCase("cat")) {
        System.out.println("A cat? Seriously? I like sharks, they would eat your cat.");
      }

      else {
        System.out.println(userInput + " are cool too, but I prefer sharks.");
      }

      long guess = 0;

      int randomNumber = (int)(Math.random()*10);


      System.out.println("I have a number between 0 and 10 in my mind. Can you find it out? If you enter anything that isn't a number I will die!");


      if(myScanner.hasNextDouble()) {
        guess = (long) myScanner.nextDouble();

        if(guess == randomNumber) {
          System.out.println("That's correct!");

      }

      else {
        System.out.println("Sorry, that's not it, try again some other time.");

        System.out.println("The number I was thinking of was " + randomNumber);
      }
      }

      else {
        System.out.println("You tried to kill me! That wasn't a number!");

        myScanner.next();

      }

      whatNext();
    }



    public void whatNext() {
      System.out.println("\n\nWhat do you want to do? Math? Talk? Or exit?");

      userInput = myScanner.next();

      if(userInput.equalsIgnoreCase("math")) {
        calculate();
      }

      else if(userInput.equalsIgnoreCase("talk")) {
        talk();
      }

      else if(userInput.equalsIgnoreCase("exit")) {
        System.exit(1);

      }

      else {
        System.out.println(userName + "!!!! Why are you trying to confuse me??? " + userInput + " is not a choice!");

        whatNext();
      }
    }
   }