如果您试图获取所有相邻单元格并对其进行处理(例如添加它们),那么您需要进行某种边界检查,例如从中进行一些修改可能会起作用:
for (int i = 0; i < numOfRows; i++) {
for (int j = 0; j < numOfCols; j++) {
// check all bounds out of range:
int iMin = Math.max(0, i - 1);
int iMax = Math.min(numOfRows - 1, i + 1);
int jMin = Math.max(0, j - 1);
int jMax = Math.min(numOfCols - 1, j + 1);
// loop through the above numbers safely
for (int innerI = iMin; innerI <= iMax; innerI++) {
for (int innerJ = jMin; innerJ <= jMax; innerJ++) {
if (i != innerI && j != innerJ) {
// do what needs to be done
}
}
}
}
}