Java ArrayIndexOutOfBoundsException(Minesweeper)

时间:2018-02-06 14:06:52

标签: java arrays indexoutofboundsexception minesweeper

我正在尝试制造一个简单的扫雷艇,在n * n板上种植n * n / 3个地雷。地雷用*标记,空格用0标记。(它还没有作为游戏起作用:我试图制作扫雷的答题纸)请注意我没有故意使用任何方法。

我经常在第23行遇到错误:

  

线程中的异常" main" java.lang.ArrayIndexOutOfBoundsException:15

我已经尝试了几个小时来解决这个问题,但似乎都没有用。任何人都可以指出错误以及我应该如何修复我的代码?感谢。

import java.util.Scanner;
public class Minesweeper {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        char board[][] = new char [n][n]; // makes board of n*n
        int a, b;
        for (int i = 0; i < board.length; i++) {
            for (int j = 0; j < board[i].length; j++) {
                board[i][j] = '0';
            }
        }
        for (int i = 0; i < n * n / 3; i++) { // '*' is a mine
            a = (int)(Math.random() * (n - 1) + 1.0);
            b = (int)(Math.random() * (n - 1) + 1.0);
            board[a][b] = '*';
        }

        for (int i = 0; i < board.length; i++) {
            for (int j = 0; j < board[i].length; j++) {
                for (int k = i - 1; k <= i + 1 && k >= 0 && k <= n; k++) {
                    for (int l = j - 1; l <= j + 1 && l >= 0 && l <= n; l++) {
                        if (board[k][l] == '*' && !(k == i && l == j)) {
                            board[i][j] = (char)(Character.getNumericValue(board[i][j]) + 1);
                        }
                    }
                }
            }
        }

        for (int i = 0; i < board.length; i++) {
            for (int j = 0; j < board[i].length; j++) {
                System.out.println(board[i][j]);
            }
        }
    }

}

1 个答案:

答案 0 :(得分:1)

           for (int k = i - 1; k <= i + 1 && k >= 0 && k <= n; k++) {
                for (int l = j - 1; l <= j + 1 && l >= 0 && l <= n; l++) {

应该是k&lt; n和l&lt; ñ。 n已经超出界限。

另外

    for (int i = 0; i < n * n / 3; i++) { // '*' is a mine
        a = (int)(Math.random() * (n - 1) + 1.0);
        b = (int)(Math.random() * (n - 1) + 1.0);
        board[a][b] = '*';
    }

似乎错了,我认为应该是

    for (int i = 0; i < n * n / 3; i++) { // '*' is a mine
        a = (int)(Math.random() * n);
        b = (int)(Math.random() * n);
        board[a][b] = '*';
    }