Ввод с клавиатуры и Scanner

import java.io.IOException;
import java.util.Scanner;
 
public class Main {
 
    public static void main(String[] args) throws IOException {
        Scanner answerReader = new Scanner(System.in);
        System.out.println("Greetings! Welcome to the PizzaPlace. My name is PizzaBot 3000.\n" +
                "Are you ready to order?\n\n(TYPE "y" FOR YES, "n" FOR NO, "?" OR "help" FOR HELP)\n");
 
        answerReader.next();
        if (answerReader.hasNext("n")) {
 
            System.out.println("I understand. Please visit PizzaPlace again when you ready.");
            throw new Error("Client rejected service");
        }
    }
}

    public static void main(String[] args) {
        Scanner answerReader = new Scanner(System.in);
        System.out.println("Greetings! Welcome to the PizzaPlace. My name is PizzaBot 3000.\n" +
                "Are you ready to order?\n\n(TYPE "y" FOR YES, "n" FOR NO, "?" OR "help" FOR HELP)\n");
 
        String answer = answerReader.next();
        switch(answer) {
            case "n":
                System.out.println("I understand. Please visit PizzaPlace again when you ready.");
                throw new Error("Client rejected service");
            case "y":
                System.out.println("I understand. Yes.");
                break;
            case "help":;
            case "?":
                System.out.println("I understand. I cannot help you.");
                break;
            default: 
                System.out.println("Incorrect input.");
        }
    }

...
System.out.println("Greetings! Welcome to the PizzaPlace. My name is PizzaBot 3000.\n" + "Are you ready to order?\n\n(TYPE "y" FOR YES, "n" FOR NO, "?" OR "help" FOR HELP)\n");
 
        answerReader.toString();
        if (answerReader.hasNext("n")) 
...

    public static void main(String[] args) {
        Scanner answerReader = new Scanner(System.in);
        System.out.println("Greetings! Welcome to the PizzaPlace. My name is PizzaBot 3000.\n" +
                "Are you ready to order?\n\n(TYPE "y" FOR YES, "n" FOR NO, "?" OR "help" FOR HELP)\n");
 
        String answer;
        do
        {
            answer = answerReader.next();
            switch(answer) {
                case "n":
                    System.out.println("I understand. Please visit PizzaPlace again when you ready.");
                    throw new Error("Client rejected service");
                case "y":
                    System.out.println("Processing Yes.");
                    break;
                case "help":;
                case "?":
                    System.out.println("I understand. I cannot help you.");
                    break;
                default: 
                    System.out.println("Incorrect input.");
            }
        } while(answer.compareTo("y") != 0);
        answerReader.close();
    }