Java在用户按下按钮时停止do-while循环

Question

Java新手。 因此，我希望用户能够通过键入“退出”来随时停止付款过程。 我该如何实现？ 尝试了do-while循环，但无法正常工作。 这是代码

  public void payItems() {
    Scanner s = new Scanner(System.in);
    String word;
    do {
        System.out.println("Enter name: ");
        String name = s.next();
        s.nextLine();
        //where should I put word = s.next
        System.out.println("Enter address: ");
        String address = s.nextLine();
        System.out.println("Enter card number: ");
        int cardNo = s.nextInt();
        System.out.println("Enter card expiration date: (DDMMYY)");
        int expirationDate = s.nextInt();
        Customer newcust = new Customer(name, address, cardNo, expirationDate);
    } while (!word.equals("quit"));
}

Answer 1

您只需按以下步骤更改代码

 boolean status=true;
    do {
        Scanner s = new Scanner(System.in);
        System.out.println("Enter name: ");
        String name = s.nextLine();
        System.out.println("Enter address: ");
        String address = s.nextLine();
        System.out.println("Enter card number: ");
        int cardNo = s.nextInt();
        System.out.println("Enter card expiration date: (DDMMYY)");
        int expirationDate = s.nextInt();
        System.out.println("You want to add more or quit(type continue to add another, type quit to exit): ");
        String word=s.next();
        if(word.equals("quit")){
            status=false;
        }
    } while (status);

Answer 2

因此，您必须执行以下操作：

Scanner s = new Scanner(System.in);
System.out.println("Enter name: ");
String name = s.next();
s.nextLine();
if (name.equals("quit") 
   return;
//where should I put word = s.next
System.out.println("Enter address: ");
String address = s.nextLine();
if (address.equals("quit") 
   return;
System.out.println("Enter card number: ");
int cardNo = s.nextInt();
System.out.println("Enter card expiration date: (DDMMYY)");
int expirationDate = s.nextInt();
Customer newcust = new Customer(name, address, cardNo, expirationDate);

但是对于cardNo和expiration无效，因为它们是int值，所以您不能输入“ quit”。