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阅读题

阅读下面的代码如何解决五子棋验证

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public class Game {     int[][] board;    int size = 15;     boolean overFiveAt(int x, int y) {        int[][] directions = {{0, -1}, {1, -1}, {1, 0}, {1, 1}};        for (int i = 0; i < directions.length; i++) {            int[] direction = directions[i];            if (overFiveByDirection(x, y, direction[0], direction[1])) {                return true;            }        }        return false;    }     boolean overFiveByDirection(int x, int y, int dx, int dy) {        int count = 0;        count += countOnDirection(x, y, dx, dy);        count += countOnDirection(x, y, -dx, -dy);        count --;        return count >= 5;    }     int countOnDirection(int x, int y, int dx, int dy) {        int referenceToken = board[y][x];        int count = 1;        while (true) {            x += dx;            y += dy;            if (!inBoard(x, y)) {                break;            }            int token = board[y][x];            if (token == referenceToken) {                count ++;            } else {                break;            }        }        return count;    }     boolean inBoard(int x, int y) {        return x >= 0 && x < size && y >= 0 && y < size;    }}