使用nextInt时出现InputMismatchException

Question

我正在阅读一个文本文件以获取第一个Int，该Int用于设置网格的尺寸，然后它应读取一系列int行以填充该网格。我在数字的第三行上收到InputMismatchException。如何正确读取数字？

class Grid {
    protected int rows;// number of grid rows
    protected int cols;// number of grid columns

    protected boolean[][] grid;// the grid containing blobs
    boolean[][] visited;// used by blobCount

    public Grid(String fileName) throws FileNotFoundException {
        //reading file using scanner
        Scanner sc = new Scanner(new File(fileName));
        //first number is the dimension for rows
        this.rows = sc.nextInt();
        //since it is square matrix second dimension is same as first
        this.cols = this.rows;
        grid = new boolean[rows][cols];

        for (int i = 0; i < rows; i++)
            for (int j = 0; j < cols; j++) {
                //reading from file 1 and 0 if 1 then store true else store false in grid                
                int number = sc.nextInt();
                if (number == 1 )
                    grid[i][j] = true;
                else
                    grid[i][j] = false;
            }
    }

public class BlobCountCF {
    public static void main(String[] args) throws FileNotFoundException {

        Scanner input = new Scanner(System.in);
        System.out.println("Enter filename: ");
        String fileName = input.nextLine();

        Grid grid = new Grid(fileName);

        // display grid and blob count
        System.out.println(grid);
        System.out.println("\nThere are " + grid.blobCount() + " blobs.\n");
    }
}

我应该最后显示网格（15行，每行15个数字），然后显示斑点。该文件的第一行包含数字15，一个空行，然后是15行的15个1和0。我相信它正在尝试将每个行读为一个int，但是我不确定是否是这种情况。