java - 仅在用户输入给出"is"后才结束循环 - Java

Question

我正在尝试创建一个应用程序来接受汉堡包订单并添加附加内容。我希望汉堡的添加基于扫描仪输入，但我收到错误“线程“main”java.util.NoSuchElementException 中的异常:未找到行”。如果有人能帮助我理解我哪里出了问题，我将不胜感激。我是 Java 新手，请耐心等待。

我的代码:

public class Hamburger {

    private String name;
    private double price;
    private String breadRoll;
    private String meat;


    private String addition1Name;
    private double addition1Price;

    private String addition2Name;
    private double addition2Price;

    private String addition3Name;
    private double addition3Price;

    private String addition4Name;
    private double addition4Price;


    public Hamburger(double price, String meat) {
        this.name = "Basic Hamburger";
        this.price = price;
        this.breadRoll = "White Bread";
        this.meat = meat;
    }

    public void checkingAdditionCount(){

        Scanner scanner = new Scanner(System.in);

        System.out.println("Do you want to add more items?");
        String answer = scanner.nextLine().toLowerCase();

        boolean isCont = true;

        while (isCont && scanner.hasNextLine()){
            if (answer.equals("y")){
                additions();

            } else if (answer.equals("n")){
                addAllItemsAndBill();
                isCont = false;
                scanner.close();

            } else {
                System.out.println("Please enter valid choice");
                additions();
            }
        }




    public void addAllItemsAndBill() {
        System.out.println("Your total bill amount is " + this.price);

    }

    public void additions(){

        Scanner scanner = new Scanner(System.in);


        for (int count = 1; count < 5; count++){

            System.out.println("Enter the addition name: ");
            String additionName = scanner.nextLine();

            System.out.println("Enter the addition price: ");
            if (scanner.hasNextDouble()){
                double additionPrice = scanner.nextDouble();
                this.price += additionPrice;
            }
            scanner.nextLine();
            checkingAdditionCount();

        }
        scanner.close();

        this.addition1Name = name;
        this.addition1Price = price;

    }



    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public String getBreadRoll() {
        return breadRoll;
    }

    public void setBreadRoll(String breadRoll) {
        this.breadRoll = breadRoll;
    }

    public String getMeat() {
        return meat;
    }

    public void setMeat(String meat) {
        this.meat = meat;
    }
}

Answer 1

尝试代码，例如:

while(true) {
  if(scanner.nextLine().equals("y")) break;
}

它将循环直到用户输入不等于“y”:)