如何修复java.lang.arrayindexoutofboundsexception：0？ [英] how to fix java.lang.arrayindexoutofboundsexception: 0?

问题描述

我是 java 的新手。任何人都可以帮我解决错误 arrayindexoutofboundsexception 。

I'm a newbie to java. Can anyone pls help me with resolving the error arrayindexoutofboundsexception.

public class Minesweeper { 
   public static void main(String[] args) { 

      int M = Integer.parseInt(args[0]);
      int N = Integer.parseInt(args[1]);
      double p = Double.parseDouble(args[2]);

      // game grid is [1..M][1..N], border is used to handle boundary cases
      boolean[][] bombs = new boolean[M+2][N+2];
      for (int i = 1; i <= M; i++)
         for (int j = 1; j <= N; j++)
            bombs[i][j] = (Math.random() < p);

      // print game
      for (int i = 1; i <= M; i++) {
         for (int j = 1; j <= N; j++)
            if (bombs[i][j]) System.out.print("* ");
            else             System.out.print(". ");
         System.out.println();
      }

      // sol[i][j] = # bombs adjacent to cell (i, j)
      int[][] sol = new int[M+2][N+2];
      for (int i = 1; i <= M; i++)
         for (int j = 1; j <= N; j++)
            // (ii, jj) indexes neighboring cells
            for (int ii = i - 1; ii <= i + 1; ii++)
               for (int jj = j - 1; jj <= j + 1; jj++)
                  if (bombs[ii][jj]) sol[i][j]++;

      // print solution
      System.out.println();
      for (int i = 1; i <= M; i++) {
         for (int j = 1; j <= N; j++)
            if (bombs[i][j]) System.out.print("* ");
            else             System.out.print(sol[i][j] + " ");
         System.out.println();
      }

   }
}

此处是例外：

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0 at Minesweeper.main(Minesweeper.java:5) 

推荐答案

可能有两件事，因为它表示索引0（见第一个案例）：

Two things probably as it says index 0 (see first case for the same):

1. 您没有将参数传递给您的主类。

1. You are not passing arguments to your main class.

数组索引始终从0开始而不是1.因此您可能需要更改：

Array index always start from 0 and not 1. So you might need to change either:

• 你的循环从0开始并检查i< M或N


• 您使用数组索引作为i - 1而不是i。

您获得ArrayIndexOutOfBoundException的原因是假设您在数组中有2个元素。它将如下所示：

Reason you are getting ArrayIndexOutOfBoundException is lets say you have 2 elements in an array. It will be as below:

a[0] = 1;
a[1] = 2;

当你使用i = 1循环时; i< = 2您正在访问：

And when you are looping using i = 1; i<=2 you are accessing:

a[1] - which is perfect
a[2] - which was not expected?

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