java - 如何在 while 循环内使用 Scanner hasNextInt() ？

Question

我无法退出 while 循环。

我不知道为什么 sc.hasNextInt() 在上次读取数字后不返回 false。

我应该使用其他方法还是我的代码有错误？

public static void main(String[] args) {

        // Creating an array by user keyboard input
        Scanner sc = new Scanner(System.in);

        System.out.println("Length of array: ");
        int[] numbers = new int[sc.nextInt()];

        System.out.printf("Type in integer elements of array ", numbers.length);
        int index = 0;
        **while ( sc.hasNextInt()) {**
            numbers[index++] = sc.nextInt();


        }
        // created method for printing arrays
        printArray(numbers);
        sc.close();


}

Answer 1

执行以下操作:

使用输入长度作为循环的结尾。

        // Creating an array by user keyboard input
        Scanner sc = new Scanner(System.in);

        System.out.println("Length of array: ");

        int len = sc.nextInt();
        int[] numbers = new int[len]; // use len here

        System.out.printf("Type in integer elements of array ", numbers.length);
        int index = 0;
        for (index = 0; index < len; index++) { // and use len here
            numbers[index] = sc.nextInt();
        }
        // created method for printing arrays
        printArray(numbers);
        sc.close();

并且不要关闭扫描仪。