Question

我想用Java创建游戏Battleship，但我不知道如何制作这样的数组：

#standardSQL
WITH dates AS (
  SELECT day FROM UNNEST(GENERATE_DATE_ARRAY(DATE '2018-07-05', '2018-07-09', INTERVAL 1 DAY)) AS day
), targets AS (
  SELECT DATE '2018-07-06' AS day, 'UK' AS Market, NUMERIC '2.4' AS quantity
  UNION ALL SELECT '2018-07-06', "US", 8.4
  UNION ALL SELECT '2018-07-06', "US", 1.2
  UNION ALL SELECT '2018-07-08', "UK", 3.0
  UNION ALL SELECT '2018-07-08', "US", 10.9
), sales AS (
  SELECT DATE '2018-07-08' AS day, 'UK' AS Market, 4 AS quantity
  UNION ALL SELECT '2018-07-06', 'US', 15
)
SELECT 
  dates.day AS day,
  t.market AS market,
  targetQuantity,
  quantity
FROM dates 
LEFT JOIN (SELECT day, market, SUM(quantity) AS targetQuantity FROM targets GROUP BY day, market) t
  ON dates.day = CAST(t.day AS DATE)
LEFT JOIN (SELECT day, market, SUM(quantity) AS quantity FROM sales GROUP BY day, market) s
  ON dates.day = CAST(s.day AS DATE) AND t.market = s.market
ORDER BY day, market

我希望可以轻松设置字段的元素。这样我就可以通过用户输入轻松地操作该字段。

例如：

我希望D6成为*

10 - - - - - - - - - - 
9 - - - - - - - - - - 
8 - - - - - - - - - - 
7 - - - - - - - - - - 
6 - - - - - - - - - - 
5 - - - - - - - - - - 
4 - - - - - - - - - - 
3 - - - - - - - - - - 
2 - - - - - - - - - - 
1 - - - - - - - - - - 
  A B C D E F G H I J

Answer 1

我建议您实施。这是一个Grid类，它允许您定义String 10x10的网格。如您所见，您可以使用1-10和列A-J之间的行来读写元素。 main方法仅显示用法示例：

public class Grid {

    public Grid() {
        for (int i = 0; i < elements.length; i++) {
            elements[i] = "-";
        }
    }

    private String elements[] = new String[100];

    public void print() {

        for (int i = 0; i < elements.length; i++) {
            if (i % 10 == 0) {
                System.out.println();
                System.out.print(String.format("%2d",10 - i / 10));
            }
            System.out.print(" " + elements[i]);
        }

        System.out.print("\n  ");

        for (int i = 0; i < 10; i++) {
            System.out.print(" " + (char)(i + 'A'));
        }
    }

    public String get(int row, char col) {
        return elements[(10-row)*10-('A'-col)];
    }

    public void set(int row, char col, String value) {
        if (row>=1 && row<=10 && col>='A' && col<='J') {
            elements[(10-row)*10-('A'-col)]=value;
        }
    }


    public static void main(String[] args) {
        Grid grid = new Grid();

        grid.set(1, 'A', "x");
        grid.set(1, 'B', "t");
        grid.set(10, 'A', "y");
        grid.set(10, 'J', "r");
        grid.set(5, 'J', "r");
        grid.set(1, 'J', "x");
        grid.set(6, 'D', "*");

        grid.print();
    }
}

Main被执行的结果是：

10 y - - - - - - - - r
 9 - - - - - - - - - -
 8 - - - - - - - - - -
 7 - - - - - - - - - -
 6 - - - * - - - - - -
 5 - - - - - - - - - r
 4 - - - - - - - - - -
 3 - - - - - - - - - -
 2 - - - - - - - - - -
 1 x t - - - - - - - x
   A B C D E F G H I J

Answer 2

您是否正在寻找符合这些条件的东西？

API：

课程：

战场
位置
瓷砖（枚举）

互动：

新董事会：new Battleground() b
印制板：System.out.print(b)
设置图块：b.set(Position.get(10, 'J'), Tile.IntactShip)

代码：

public class Game
{
    public static void main (String[] args) throws java.lang.Exception
    {
        Game game = new Game();
        game.demo();
    }

    public void demo()
    {
        Battleground b = new Battleground();
        b.set(Position.get(7, 'C'), Tile.IntactShip);
        b.set(Position.get(7, 'D'), Tile.IntactShip);
        b.set(Position.get(7, 'E'), Tile.IntactShip);
        b.set(Position.get(7, 'F'), Tile.IntactShip);
        b.set(Position.get(5, 'E'), Tile.IntactShip);
        b.set(Position.get(4, 'E'), Tile.IntactShip);
        System.out.println(b);
    }
}

class Battleground
{
    private Tile[][] tiles = new Tile[10][10];

    public Battleground()
    {
        fill(Tile.Unknown);
    }

    public Tile get(Position pos)
    {
        return tiles[pos.row-1][pos.column-'A'];
    }

    public void set(Position pos, Tile tile)
    {
        tiles[pos.row-1][pos.column-'A'] = tile;
    }

    public void fill(Tile tile)
    {
        for (Position p = Position.FIRST; p != null; p = p.next())
            set(p, tile);
    }

    public String toString()
    {
        StringBuilder sb = new StringBuilder();
        for (int row = 10; row >= 1; row--)
        {
            sb.append((row > 9 ? "" : " ") + row);
            for (char col = 'A'; col <= 'J'; col++)
                sb.append(" " + tiles[row-1][col-'A']);
            sb.append("\n");
        }
        sb.append("  ");
        for (char col = 'A'; col <= 'J'; col++)
            sb.append(" " + col);
        sb.append("\n");
        return sb.toString();
    }
}

class Position
{
    public static final Position FIRST = get(10, 'A');

    public final int row;
    public final char column;

    private Position(int row, char col)
    {
        this.row = row;
        this.column = col;
    }

    public static Position get(int row, char col) throws java.lang.IllegalArgumentException
    {
        if (row < 1 || row > 10 || col < 'A' || col > 'J')
            throw new IllegalArgumentException();
        return new Position(row, col);
    }

    public Position next()
    {
        if (row == 1 && column == 'J')
            return null;
        if (column == 'J')
            return new Position(row-1, 'A');
        return new Position(row, (char)(column+1));
    }
}

enum Tile
{
    Unknown('.'),
    Empty('*'),
    IntactShip('O'),
    DestroyedShip('X');

    private char symbol;

    Tile(char symbol) {
        this.symbol = symbol;
    }

    public String toString() {
        return "" + symbol;
    }
}

多维数组设置元素的简便方法

2 个答案: