线程“AWT-EventQueue-0”中的异常 java.lang.ArrayIndexOutOfBoundsException: 10
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Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 10
提问by user2052855
I'm making a minesweeper using a recursive method to open all tiles adjacent to the block "0".
我正在使用递归方法制作扫雷艇，以打开与“0”块相邻的所有瓷砖。
Everything goes well until I get the exception I mentioned in the title. The exception is fired at if(removalList[num1][num2] == 1){return;}, but made sure to set all the initial values in the removal list to zero. (For your reference, 1means that the item has already been added to the removalListfor later removal).
一切都很顺利，直到我得到标题中提到的例外。在 处触发异常if(removalList[num1][num2] == 1){return;}，但确保将删除列表中的所有初始值设置为零。（供您参考，这1意味着该项目已添加到removalList稍后删除）。
I also checked to see if it was in bounds by doing if(num1 > gameWidth || num2 > gameHeight || num1 < 0 || num2 < 0){return;}. (gameHeight and width are both 10), but for some reason it thinks that it's out of bounds.
我还通过执行 来检查它是否在边界内if(num1 > gameWidth || num2 > gameHeight || num1 < 0 || num2 < 0){return;}. (gameHeight and width are both 10)，但由于某种原因，它认为它超出了边界。
Thanks for your help!
谢谢你的帮助！
private void function(int c5, int r5)
{
int num1 = c5;
int num2 = r5;
if(num1 > gameWidth || num2 > gameHeight || num1 < 0 || num2 < 0)
{
return;
}
if(removalList[num1][num2] == 1)
{
return;
}
if(blocks[num1][num2] == 0)
{
System.out.println("Added (" + num1 + ", " + num2 + ") to removal list.");
removalList[num1][num2] = 1;
function(num1-1, num2);
function(num1, num2-1);
function(num1+1, num2);
function(num1, num2+1);
}
else if(blocks[num1][num2] > 0 && blocks[num1][num2] < 9)
{
removalList[num1][num2] = 1;
return;
}
else
{
return;
}
}
回答by SudoRahul
If the size of an array is 10, the max possible accessible index in the array would be array[size-1]. If you try to access an index, greater than or equal to the size, then you'd get what is called an ArrayIndexOutOfBoundsException.
如果数组的大小为 ，则数组中10可能的最大可访问索引为array[size-1]。如果您尝试访问大于或等于大小的索引，那么您将获得所谓的ArrayIndexOutOfBoundsException.
E.g:-
例如：-
int[] test = new int[5];
test[0] = 1; // Allowed
test[1] = 2; // Allowed
test[2] = 3; // Allowed
test[3] = 4; // Allowed
test[4] = 5; // Allowed
test[5] = 6; // NOT Allowed - You'll get the ArrayIndexOutOfBoundsException here.
Hence, in your case,
因此，在你的情况下，
removalList[9][9]is allowed, but removalList[10][10]will give the ArrayIndexOutOfBoundsException.
removalList[9][9]是允许的，但removalList[10][10]会给出ArrayIndexOutOfBoundsException。
回答by Philipp Matthias Sch?fer
Without seeing further code, in particular the declaration of removalList, I can only guess. My guess is, that removalListhas gameWidth * gameHeightelements. So the indices run from 0to gameWidth - 1and from 0to gameHeight - 1. Your check allows indices of up to gameWidthand gameHeight, which would cause the exception you are getting.
没有看到进一步的代码，特别是 的声明removalList，我只能猜测。我的猜测是，这removalList有gameWidth * gameHeight元素。所以索引从0togameWidth - 1和 from 0to运行gameHeight - 1。您的检查允许索引最多gameWidth和gameHeight，这会导致您获得异常。
