我应该如何编写这段代码？

Question

again: 
     while (!s.hasNextInt()) s.next(); 
     amount = s.nextInt(); 
    if(amount < 0 || amount > numberOfCards) { 
     System.out.println("You need to enter a number between 0 and "+numberOfCards); 
     goto again; 
    } 

它在C＃中正常工作，但在Java中没有转到。我可以想到大量复杂的重做方式，但我对什么是最干净的最推荐的编写代码的方式感兴趣。

Answer 1

笨的办法：

while (true) { 
    while (!s.hasNextInt()) s.next(); 
     amount = s.nextInt(); 
    if(amount < 0 || amount > numberOfCards) { 
     System.out.println("You need to enter a number between 0 and "+numberOfCards); 
    } else { 
     break; 
    } 
} 

Answer 2

把它包在一个循环：

while (amount < 0 || amount > numberOfCards) { 
    while (!s.hasNextInt()) s.next(); 
    amount = s.nextInt(); 
    if(amount < 0 || amount > numberOfCards) { 
     System.out.println("You need to enter a number between 0 and "+numberOfCards); 
    } 
}