Java在用戶按下按鈕時停止do-while循環

Question

Java新手。 因此，我希望用戶能夠通過鍵入“退出”來隨時停止付款過程。 我該如何實現？ 嘗試了do-while循環，但無法正常工作。 這是代碼

  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

您只需按以下步驟更改代碼

 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，您必須執行以下操作：

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);

但是對於cardNo和expiration無效，因為它們是int值，所以您不能輸入“ quit”。