0

我正在制作一个生活游戏。

以下代码旨在检查一个点有多少个邻居。

public int neighbours(int x, int y){
    int result = 0;
if(x!=0 && y!=0 && y!=getHeight() && x!= getLength()){
    if (life[x - 1][y + 1] == 1)
        result++;
    else if (life[x][y + 1] == 1)
        result++;
    else if (life[x + 1][y + 1] == 1)
        result++;
    else if (life[x + 1][y] == 1)
        result++;
    else if (life[x + 1][y - 1] == 1)
        result++;
    else if (life[x][y - 1] == 1)
        result++;
    else if (life[x - 1][y - 1] == 1)
        result++;
    else if (life[x - 1][y] == 1)
        result++;
} else if(x==0 && y==0){
    if (life[x][y + 1] == 1)
        result++;
    else if (life[x + 1][y + 1] == 1)
        result++;
    else if (life[x + 1][y] == 1)
        result++;
}
else if(x==0 && y==getHeight()){
    if (life[x + 1][y] == 1)
        result++;
    else if (life[x + 1][y - 1] == 1)
        result++;
    else if (life[x][y - 1] == 1)
        result++;
}
else if(y==getHeight() && x==getLength()){
    if (life[x][y - 1] == 1)
        result++;
    else if (life[x - 1][y - 1] == 1)
        result++;
    else if (life[x - 1][y] == 1)
        result++;
}
else if(y==0 && x==getLength()){
    if (life[x - 1][y + 1] == 1)
        result++;
    else if (life[x][y + 1] == 1)
        result++;
    else if (life[x - 1][y] == 1)
        result++;
}
else if (x==0){
    if (life[x][y + 1] == 1)
        result++;
    else if (life[x + 1][y + 1] == 1)
        result++;
    else if (life[x + 1][y] == 1)
        result++;
    else if (life[x + 1][y - 1] == 1)
        result++;
    else if (life[x][y - 1] == 1)
        result++;
}
else if(y==getHeight()){
    if (life[x + 1][y] == 1)
        result++;
    else if (life[x + 1][y - 1] == 1)
        result++;
    else if (life[x][y - 1] == 1)
        result++;
    else if (life[x - 1][y - 1] == 1)
        result++;
    else if (life[x - 1][y] == 1)
        result++;
}
else if(x==getLength()){
    if (life[x - 1][y + 1] == 1)
        result++;
    else if (life[x][y + 1] == 1)
        result++;
    else if (life[x][y - 1] == 1)
        result++;
    else if (life[x - 1][y - 1] == 1)
        result++;
    else if (life[x - 1][y] == 1)
        result++;
}
else if(y==0 && x!=getLength() && x!=0){
    if (life[x - 1][y + 1] == 1)
        result++;
    else if (life[x][y + 1] == 1)
        result++;
    else if (life[x + 1][y + 1] == 1)
        result++;
    else if (life[x + 1][y] == 1)
        result++;
    else if (life[x - 1][y] == 1)
        result++;
}
    return result;
}

如您所见，我试图解决所有异常，但程序不断给我以下错误：

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 30
at LifeGrid.neighbours(LifeGrid.java:165)
at LifeGrid.run(LifeGrid.java:179)
at TestLife.main(TestLife.java:15)

你们知道为什么当我处理所有可能的异常时仍然会发生越界异常吗？

4

2 回答 2

2

您需要检查 <getHeight/Width()，而不是 ==。如果它是 == getHeight 或 getWidth ，它将超出范围。

于 2013-11-11T19:53:39.867 回答
0

您的检查y == getHeight()需要是y == getHeight() - 1，因为这是您在棋盘底部边缘时将拥有的值。此外，您的检查x == getLength()需要是x == getLength() - 1，因为这是您在棋盘右侧边缘时将拥有的值。

于 2013-11-11T19:59:42.353 回答