java - 我在 TicTacToe 游戏中设置 'piece' 的方法不起作用

Question

在主方法中调用方法 setPiece(int x, int y, charpiece) 时，我希望棋盘上填充参数中给出的字符，但由于某些原因，我没有得到我所期望的结果当我在调用该方法后打印出电路板时。

public class TicTacToe {
    private char[][] board;

public TicTacToe() {
    board = new char[3][3];
    for (int r = 0; r < 3; r++) {
        for (int c = 0; c < 3; c++) {
            board[r][c] = ' ';
        }
    }

}

public void setPiece(int x, int y, char piece){
    board[x][y] = piece;

}


public String toString(){
    String result = "";
    for (int r = 0; r < 3; r++) {
        for (int c = 0; c < 3; c++) {
            board[r][c] = ' ';      
            System.out.print(board[r][c] + " | ");
        }
        System.out.println();

    }
    return result;
}


public static void main(String[] args) {
    TicTacToe board = new TicTacToe();  
    board.setPiece(1, 2, 'x');
    System.out.println(board); //I am expecting here the board to be filled with 'x', but it won't work so. 

}

}

我在这里做错了什么？我应该如何重写我的方法以获得我想要的结果？

Answer 1

在 toString board[r][c] = ' ';错了

public String toString() {
    String result = "";
    for (int r = 0; r < 3; r++) {
        for (int c = 0; c < 3; c++) {
            System.out.print(board[r][c] + " | ");
        }
        System.out.println();

    }
    return result;
}