java - 如何退出这个循环呢？

Question

我想只需按 Enter 键即可退出循环。这个怎么做？现在，当我输入任何非数字值并按 Enter 时，循环就会退出。如何不输入任何内容按 Enter 退出？

ArrayList<Integer> numbers = new ArrayList<Integer>();
int numberIn;
Scanner scan = new Scanner(System.in);
System.out.println("Enter numbers!");

while (scan.hasNextInt()) {
    numberIn = scan.nextInt();
    numbers.add(numberIn);
}

System.out.println("Numbers: " + numbers + ".");

Answer 1

这对我有用:

ArrayList<Integer> numbers = new ArrayList<Integer>();
int numberIn;
Scanner scan = new Scanner(System.in);
System.out.println("Enter numbers!");

String input;
while (!(input = scan.nextLine()).isEmpty()) {
    numberIn = Integer.parseInt(input);
    numbers.add(numberIn);
}

System.out.println("Numbers: " + numbers + ".");