Game Of Life - OpenProcessing

mySketch
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GRIDSIZE = 20;
​
class Row {
  ArrayList < int > cells;
  int length = 0;
​
  Row(int size) {
    cells = new ArrayList < int > ();
    length = size;
​
    for (int c = 0; c < length; c++)
    {
      cells.add(0);
    }
  }
​
  int get(int cell) {
    return cells.get(cell);
  }
}
​
ArrayList < Row > grid = new ArrayList < Row > ();
​
void setup() {
​
  size(800, 800);
  background(200, 200, 200);
​
  for (int j = 0; j < (width / GRIDSIZE); j++) {
    grid.add(new Row((width / GRIDSIZE)));
  }
​
}
​
void draw() {
  noStroke();
​
  for (int y = 0; y < int((width / GRIDSIZE)); y++) {
    for (int x = 0; x < int((width / GRIDSIZE)); x++) {
      if (grid.get(y).cells.get(x) == 0) {
        fill(0, 0, 0);
      } else
        fill(255, 255, 255);
      rect(x * GRIDSIZE + GRIDSIZE / 10, y * GRIDSIZE + GRIDSIZE / 10, (GRIDSIZE - GRIDSIZE / 5), (GRIDSIZE - GRIDSIZE / 5));
    }
  }
​
  if (mousePressed) {
​
    int mX = (mouseX - mouseX % GRIDSIZE) / GRIDSIZE;
    int mY = (mouseY - mouseY % GRIDSIZE) / GRIDSIZE;
    grid.get(mY).cells.set(mX, 1);
​
  }
}