Java在用户按下按钮时停止执行循环操作

Question

Java新手。因此，我希望用户能够通过键入“退出”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，但它不工作。下面是代码

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

所以你必须做somethink这样的：

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); 

但它不工作cardNo和到期因为这些是int值，所以你不能输入“quit”。

Answer 2

只要你可以改变你的代码如下

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);