can anybody explain how countMineNeighbours method works??

Question about the task

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private void countMineNeighbors() {
        for (int y = 0; y < SIDE; y++) {
            for (int x = 0; x < SIDE; x++) {
                GameObject gameObject = gameField[y][x];

                if (!gameObject.isMine) {
                    gameObject.countMineNeighbors = Math.toIntExact(getNeighbors(gameObject).stream().filter(neighbor -> neighbor.isMine).count());
                }
            }
        }
    }

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luca

Level 17 , Saint Petersburg, Russian Federation

2 February 2021, 19:21

So from what i understand the first part goes through each object from your playing field for (int y = 0; y < SIDE; y++) { for (int x = 0; x < SIDE; x++) GameObject gameObject = gameField[y][x]; then for each object that isn t a mine you set the int countMineNeighbors (gameObject.countMineNeighbors) Math.toIntExact converts a long to a int you need this because the count() method returns a long. Then the getNeighbors(gameObject) returns a Arraylist of object (all the neighbours of the object). the stream() is used to process the arrayList, the filter() select the objects reference to put in the stream(A stream is a sequence of objects references). Then the count() returns a long with the number of item in the stream. I m not really sure so here a link for stream https://www.geeksforgeeks.org/stream-in-java/