我不知道为什么我的界限不正确以及为什么会抛出这个错误。
线程中的异常" main" 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;
}
}
所以我调用createWalk2D();然后我得到错误,eclipse将我指向这行代码:
clearPath2D[right][down] = 4;
我认为这是因为我正在循环使用incorreclty。我找不到一个解决方案,用谷歌搜索了大约一个小时三天。
这不是所有代码,但这是我认为将其抛弃的部分。提前感谢您对错误的任何帮助。如果您需要整个代码,请告诉我。
编辑: 没关系,我弄清楚了。
我必须在数组的初始声明中添加1
在这种情况下,它意味着改变
clearPath2D = new int[gridSize][gridSize];
到
clearPath2D = new int[gridSize + 1][gridSize + 1];
答案 0 :(得分:1)
您的当前问题出现在此部分代码中:
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:
if (currentStep.x == gridSize-1) {
rightReached = 1;
random = 1;
}
if (currentStep.y == gridSize-1) {
bottomReached = 1;
random = 0;
}