2015-12-02 109 views
1

我不知道为什么我在我的范围内不正确以及为何引发此错误。线程“main”中的异常

在线程异常 “主” java.lang.ArrayIndexOutOfBoundsException

private int gridSize = 3; 
private Point currentStep = new Point(0, 0); 
private Point firstStep = new Point(0, 0); 
private Point lastStep = new Point(gridSize, gridSize); 
private int pedometer = 0; 
private int random; 
private int down = 0; 
private int right = 0; 
private byte bottomReached = 0; 
private byte rightReached = 0; 
private int[][] clearPath2D; 

public void createWalk2D() { 

    clearPath2D = new int[gridSize][gridSize]; 
    for (currentStep = firstStep; currentStep != lastStep; pedometer++) { 

     step2D(); 

     if (rightReached == 1 && bottomReached == 1) { 
      break; 
     } 
    } 

    clearField(); 
} 

    public void step2D() { 

    random = stepRand.nextInt(); 

    // add a new step to the current path 
    currentStep.setLocation(right , down); 
    clearPath2D[right][down] = 4; 

    // calculates the next step based on random numbers and weather a side 
    // is being touched 

    if (currentStep.x == gridSize) { 
     rightReached = 1; 
     random = 1; 
    } 

    if (currentStep.y == gridSize) { 
     bottomReached = 1; 
     random = 0; 
    } 

    // decides the direction of the next step 
    if (random >= 0.5 && bottomReached == 0) { 
     down++; 
    } else if (random < 0.5 && rightReached == 0) { 
     right++; 
    } else if (rightReached == 1 && bottomReached == 1) { 
     done = true; 
    } 

} 

所以我所说的createWalk2D();然后我得到了错误和日食指向我的这一行代码:

clearPath2D[right][down] = 4; 

我认为这是因为我在循环incorreclty。我一直无法找到解决方案,并在三个不同的日子里搜索了大约一个小时。

这不是所有的代码,但这是我认为是抛弃它的部分。提前感谢您对错误的任何帮助。如果你需要整个代码,请让我知道。编辑: 没关系我想通了。

我在这种情况下,以1添加到阵列

的初始宣布它意味着改变

clearPath2D = new int[gridSize][gridSize]; 

clearPath2D = new int[gridSize + 1][gridSize + 1]; 
+0

自己调试代码。在行'clearPath2D [right] [down] = 4'输出到控制台前的值为'right','clearPath2D.length','down'和'clearPath2D [right] .length'。您的右侧和下侧值应始终小于数组的长度。 –

+0

'clearField();'做了什么? –

+0

可能的重复[什么导致java.lang.ArrayIndexOutOfBoundsException,以及如何防止它?](http://stackoverflow.com/questions/5554734/what-c​​auses-a-java-lang-arrayindexoutofboundsexception-and-how- do-i-prevent-it) – Raf

回答

1

你眼前的问题是在这部分代码:

if (currentStep.x == gridSize) { 
     rightReached = 1; 
     random = 1; 
    } 

    if (currentStep.y == gridSize) { 
     bottomReached = 1; 
     random = 0; 
    } 

您应该针对gridSize-1进行测试,因为这是最大有效索引。如在:

if (currentStep.x == gridSize-1) { 
     rightReached = 1; 
     random = 1; 
    } 

    if (currentStep.y == gridSize-1) { 
     bottomReached = 1; 
     random = 0; 
    } 
+0

感谢您的回复!我想出了一个不同的方式,但我非常确定这种方式也能起作用 –

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