Question

Java新手。因此，我希望用户能够通过键入＆＃34; quit＆＃34;随时停止付款流程。我怎样才能做到这一点？尝试了do-while循环，但它不起作用。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

即可

 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

所以你必须做这样的事情：

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);

但它不适用于cardNo和expiration，因为这些是int值，因此您无法输入“quit”。

当用户按下按钮时，Java停止do-while循环

2 个答案: