扫雷游戏异常错误

Question

您好，我目前正在尝试创建一个扫雷舰游戏，我有我的图形用户界面，并使用一个二维数组来存储一个位置是否有一个地雷，然而，当我尝试让游戏结束点击一个地雷使用以下代码：

if (board[row][col] == 1) {
    return GameStatus.Lost; }  
else {
    return GameStatus.Continue;
 }

我收到错误信息，因为

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 10
at Game.getGameStatus(Game.java:55)
at MineSweeperPanel$ButtonListener.actionPerformed(MineSweeperPanel.java:71)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Answer 1

检查您在row和col中调用的边界。例如，如果您有25行和25列，并且您引用的是board[25][25]，那么这就超出了数组的界限。虽然行数的总大小是25，但在数组中，索引将从0到25-1。

Answer 2

数组索引越界意味着你的数组中有(比方说) 10个元素，但你试图访问(比方说)第11个元素-它根本不存在。

健全性检查-数组从0开始索引，您在row和col中的值是否从1开始索引？

Answer 3

当它发生时？

当您尝试访问索引超过其长度的数组时，会发生越界异常。java数组的最大索引为(length -1)，例如：

String [] stringArray = new String[10];
stringArray[10]
// the code above will produce an out of bounds exception, because the it bigger than length -1, which is 10 - 1 = 9.

如果您不知道数组的大小或长度，可以从stringArray.length中知道。

怎么处理呢？

你应该确保你的程序不会访问索引长度大于- 1的数组。例如：

for(int i=0;i<stringArray.lenght;i++) {
    //write your code here
}

上面的代码将保证stringArray永远不会被访问超过它的最大索引。

你的案例

在您的情况下，您必须定义了数组限制，并尝试访问超出定义限制范围的数组数据。

另请阅读this以了解更多信息...

Example of 2d array having out of bound exception