Eragon20 - 2 years ago 82
Java Question

# Simplification of successive 'if' statements in Java

I have a series of

`if`
statements, as shown below:

``````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?

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

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