java.util.Scanner.throwFor(Scanner.java:937)

Question

在eclipse里可以运行，但是放到OJ里就报错

运行错误：

Exception in thread "main" java.util.NoSuchElementException

at java.base/java.util.Scanner.throwFor(Scanner.java:937)
at java.base/java.util.Scanner.next(Scanner.java:1594)
at java.base/java.util.Scanner.nextInt(Scanner.java:2258)
at java.base/java.util.Scanner.nextInt(Scanner.java:2212)
at Main.randomGeneratorArray(Main.java:33)
at Main.main(Main.java:92)

原代码

import java.util.Scanner;
public class develop_1165 {


    public static void bubbleSort(int[] arr) {
        for (int i = arr.length - 1; i > 0; i--) {
            for (int j = 0; j < i; j++) {
                if (arr[j] > arr[j + 1]) {
                    swap(arr, j, j + 1);
                }
            }
        }
    }

    public static void swap(int[] arr, int i, int j) {
        arr[i] = arr[i] ^ arr[j];
        arr[j] = arr[i] ^ arr[j];
        arr[i] = arr[i] ^ arr[j];
    }

    public static void displayArray(int[] arr) {
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
    }

    public static int[] randomGeneratorArray(int value, int size) {

        int[] arr = new int[size];

        Scanner sc = new Scanner(System.in);
        for (int i = 0; i < arr.length; i++) {
            int k = sc.nextInt();
            if (k <= value && k > 0) {
                arr[i] = k;
            }
        }

        return arr;
    }

    public static  int[] againArray(int[] arr1) {
        int[] arr2 = copyArray(arr1);
        for (int i = arr1.length - 1; i > 0; i--) {
            for (int j = 0; j < i; j++) {
                if (arr1[j] == arr1[i]) {
                    arr2 = deleteArray(arr2, i);
                }
            }
        }

        return arr2;
    }

    public static int[] deleteArray(int[] arr2, int num) {
        int[] arr3 =  new int[arr2.length - 1];
        if (num < arr2.length) {
            for (int i = 0; i < num; i++) {
                arr3[i] = arr2[i];
            }
            for (int i = num + 1, j = num; i < arr2.length && num < arr3.length; i++, j++) {
                arr3[j] = arr2[i];
            }

        }
        if (num <= arr2.length) {
            return arr2;
        }
        return arr3;

    }


    public static int[] copyArray(int[] arr1) {
        if (arr1 == null) {
            return null;
        }
        int[] arr2 = new int[arr1.length];
        for (int i = 0; i < arr1.length; i++) {
            arr2[i] = arr1[i];
        }
        return arr2;
    }

    public static void main (String[] args) {
        Scanner scan = new Scanner(System.in);
        int i = scan.nextInt();
        int value = 1000;
        int size;
        if (i > 0 && i <= 100) {
            size = i;
            int[] arr1 = randomGeneratorArray(value, size);
            System.out.println();
            int[] arr2 = againArray(arr1);
            bubbleSort(arr2);
            System.out.println(arr2.length);
            displayArray(arr2);
        }

    }

Answer 1

这个问题没遇到过。
不过，一个建议：Scanner就是控制输入，其他代码没必要也展示出来，这样可能会误导。