java - 如何对二维数组的元素使用方法？

Question

如何对二维数组的元素使用方法？

我有一个类board，并初始化了一个cell类型的二维数组。本质上，我想使用单元格元素，并使用该类中的方法。但是，我不确定如何实现它，因为当我尝试时出现错误

board[1][1].cellmethod()

董事会代码:

public class Board {
    private int col = 1, row= 1;
    private cell[][] board;
    private RandomNumberGenerator rand = new RandomNumberGenerator();


    public Board(){
        board = new cell[col][row];
    //Initialize board with cells
        for (int r = 0 ; r<=row; r++){
            for(int c = 0; c<= col; c++){
                board[c][r] = new cell(rand.getRandIntBetween(1,6), translateOffsetToPixel(c,r).getX(), translateOffsetToPixel(c,r).getY());
            }
        }
    }

细胞类别

public class cell {
    //which shape the cell will consist
    private int shape;

    //offset of where the cell is located by cell number -> need to translate the given coordinates to pixel
    private int x, y;

    private int SHAPE_WIDTH = 50;   //Width of each shape (pixels)
    private int SHAPE_HEIGHT = 50;  //Height of each shape (pixels)

    private Rect rect;
    private boolean visible;

    public cell(int shape, int x, int y){
        this.shape = shape;
        this.x = x;
        this.y = y;
        rect = new Rect( x, y, x + SHAPE_WIDTH, y + SHAPE_HEIGHT);
        visible = false;
    }

    public int getX() {return x;}
    public int getY() {return y;}
    public int getShape() {return shape;}



}

我在哪里调用董事会对象

public class PlayState extends State{
    private Board board;


    @Override
    public void init() {
        board = new Board();

    }

    @Override
    public void update(float delta) {

    }

    @Override
    public void render(Painter g) {
        for(int r = 0; r<=board.getRow(); r++){
            for(int c = 0; c<=board.getCol(); c++){
                board[0][0].  // ERROR, can't implement any cell methods
            }
        }

    }

Answer 1

您的 board 数组的大小为一(行和列)。

private int col = 1, row= 1;

因此，您的 board 在 board[0][0] 处只有一个可用元素，即第一行和第一列。访问 board[1][1] 因此会抛出 ArrayIndexOutOfBoundsException。

请记住，array 索引的最大值仅为 array.length - 1。

<小时/>

在您的实际实现中

board = new Board();

board 不是数组；它是一个 Board 对象。因此，显然您无法使用索引 [][] 访问它。您需要通过 getter 方法公开底层的 board[][]。

public cell[][] getBoard() {
    return board;
}

然后您可以在 render() 方法中使用 getter 作为

@Override
public void render(Painter g) {
    cell[][] boardArr = board.getBoard();
    for(int r = 0; r<=board.getRow(); r++){
        for(int c = 0; c<=board.getCol(); c++){
            boardArr[r][c].cellMethod();
        }
    }
}