How do I determine branch coverage (from a control flow graph)?

Question

I have the following piece of code (doesn't matter if it's a good method or not):

public boolean adjacent(Cell otherCell) {

  boolean result;
  boolean xdiffersone = Math.abs(getX() - otherCell.getX()) == 1;
  boolean ydiffersone = Math.abs(getY() - otherCell.getY()) == 1;

  if((xdiffersone && !ydiffersone) || (!xdiffersone && ydiffersone)) {

    result = true;
  }
  else {
    result = false;
  }

  return result;
}

The control flow graph of this method:

I know that statement coverage means whether all the nodes in a control flow graph have been executed/visited. But what exactly is branch coverage? How can I calculate/see that from a control flow graph (or from the code)?

Answer 1

Statement coverage is about graph nodes. Branch coverage is about graph edges.