Eragon20 - 6 months ago 36

Java Question

I have a series of

`if`

`if (board[x+1][y]==true) {`

ar+=1;

}

if (board[x][y+1]==true) {

ar+=1;

}

if (board[x-1][y]==true) {

ar+=1;

}

if (board[x][y-1]==true) {

ar+=1;

}

if (board[x+1][y+1]==true) {

ar+=1;

}

if (board[x+1][y-1]==true) {

ar+=1;

}

if (board[x-1][y+1]==true) {

ar+=1;

}

if (board[x-1][y-1]==true) {

ar+=1;

}

Is there a way to simplify/condense these statements with Java?

Answer

Simply loop around the position that you care about. Skipping the center of the "box".

Tip: You access a 2D array by row **then** column, or `[y][x]`

(at least, that's how you'd translate the board from looking at the code).

```
for (int xDiff = -1; xDiff <= 1; xDiff++) {
for (int yDiff = -1; yDiff <= 1; yDiff++) {
if (xDiff == 0 && yDiff == 0) continue;
if (board[y+yDiff][x+xDiff]) {
ar += 1;
}
}
}
```

Beware - Out of bounds exception is not handled

Source (Stackoverflow)