java - 在控制台中输入多个数字

Question

所以我有以下的chuckj代码，我想要它做的是让用户在netbeans控制台中输入5个数字。我想要做的方式是他可以通过用a分隔数字来输入一些数字空格或逐行，例如如下所示

但我想要的是“输入一串数字”仅在需要时才可见，例如当他需要输入下一个数字时。可以这样做吗？

下面是通过下面的代码完成的

Scanner reader = new Scanner(System.in);
        int number;
        List<Integer> numbers = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            System.out.println("Enter a string of numbers");
            number = reader.nextInt();
            numbers.add(number);
        }

        System.out.println("size" + numbers.size());
        for(int takenNumber : numbers){
            System.out.println(takenNumber);
        }

Answer 1

你可以这样做:

Scanner reader = new Scanner(System.in);
List<Integer> numbers = new ArrayList<>();

int numbersEntered = 0; // Stores how many numbers the user has entered so far
while (numbersEntered < 5) { // Keep asking if they have not entered 5 numbers yet
    System.out.println("Enter a string of numbers");
    String[] input = reader.nextLine().split(" "); // Split the input by spaces into an array
    numbersEntered += input.length; // Add the number of numbers they entered to the variable
    for (int i = 0; i < input.length; i++) {
        if (numbers.size() < 5) { // Only add the numbers if the list is not full
             numbers.add(Integer.parseInt(input[i])); // Add each number they entered to the numbers list
        }
    }
}