使用二维数组列表创建一个棋盘和棋子

Question

我目前正在尝试创建一个程序，将吐出像这样的棋盘(它在实际程序中看起来更好，只是编辑器不喜欢我使用"-"符号，所以我把它们放在引号里):

-----------------
| | | | |K| | | |
-----------------
| |P| | | |P| | |
-----------------
| | | | | | | | |
-----------------
| | | | | | | | |
-----------------
| | | | | | | | |
-----------------
| | | | | | | | |
-----------------
| | | | | |N| | |
-----------------
| | | | |K| | | |
-----------------

我使用两个方法，一个showBoard方法和一个addPiece方法。我目前使用的是addPiece方法，并且我正试图使该方法接受三个输入:行int、列int和字符串名称(例如，K代表king)。然而，我无法让addPiece方法把这些片段放到我想要它们去的地方，甚至根本无法做到。以下是目前为止的内容:

public class ChessBoard {
public static String[][] board = new String[8][8];
public static int row = 0;
public static int col = 0;
public static void addPiece(int x, int y, String r){
    board[x][y] = new String(r);
}
public static void showBoard(){
    for (row = 0; row < board.length; row++)
    {
        System.out.println("");
        System.out.println("---------------");
        for(col = 0; col < board[row].length; col++)
        {
            System.out.print("| ");
        }
    }
    System.out.println("");
    System.out.println("---------------");
}
public static void main(String[] args) {
System.out.println(board.length);
showBoard();
addPiece(1,2,"R");
}
}

我知道这与我编写addpiece方法的方式有关，但我仍然对如何编写该方法感到困惑，这是我最好的尝试(这不起作用)。有人有什么建议吗?谢谢!

Answer 1

永远不要打印片段值

for(col = 0; col < board[row].length; col++)
{
    if ( board[row][col] != null ) {
        System.out.print("|" + board[row][col]);
    }
    else 
        System.out.print("| ");
}

而且你还需要在展示板之前添加pience:

addPiece(1,2,"R"); //before
showBoard();

Answer 2

为什么使用new String(r)?您的board数组已经是字符串数组，只需使用:

board[x][y] = r;

当你在main中添加showBoard方法后的片段时，将它们切换到

addPiece(1,2,"R");
showBoard();

Answer 3

注意addPiece正在改变板的状态。如果你想看到改变，你需要重新显示新的板状态。

public class ChessBoard {
    public static String[][] board = new String[8][8];
    public static void addPiece(int x, int y, String r){
        board[x][y] = r;//no need for new String(), board is already made of Strings.
    }
    public static void showBoard(){
        //it's generally better practice to initialize loop counters in the loop themselves
        for (int row = 0; row < board.length; row++)
        {
            System.out.println("");
            System.out.println("---------------");
            for(int col = 0; col < board[row].length; col++)
            {
                System.out.print("|"); //you're only printing spaces in the spots
                if(board[column][row] == null){
                  System.ot.print(" ");
                }else{
                  System.out.print(board[column][row]);
                }
            }
        }
        System.out.println("");
        System.out.println("---------------");
    }
    public static void main(String[] args) {
        System.out.println(board.length);
        showBoard();        //board does not have R in it yet.
        addPiece(1,2,"R");  //board now has R in it.
        showBoard();        //display the new board with R in it.
    }
}