Question

我在java中编写一个Sudoku求解器，并想知道如何使用charAt或其他东西将字符串中的值赋值给2d数组？例如，这是印刷板看起来像：

     1  2  3    4  5  6      7  8  9      
  +-----------+-----------+-----------+
A |  0  0  0  |  0  0  5  |  0  9  0  |
B |  1  4  0  |  0  0  0  |  6  7  0  |
C |  0  8  0  |  0  0  2  |  4  5  1  |
  +-----------+-----------+-----------+
D |  0  6  3  |  0  7  0  |  0  1  0  |
E |  9  0  0  |  0  0  0  |  0  0  3  |
F |  0  1  0  |  0  9  0  |  5  2  0  |
  +-----------+-----------+-----------+
G |  0  0  7  |  2  0  0  |  0  8  0  |
H |  0  2  6  |  0  0  0  |  0  3  5  |
I |  0  0  0  |  4  0  9  |  0  6  0  |
  +-----------+-----------+-----------+

这是我到目前为止用于为printboard分配值的方式：

public void printBoard() {

        System.out.print("   ");
        for (int j = 0; j < 3; j++)
            System.out.print("  " + (j+1));
        System.out.print("  ");
        for (int j = 3; j < 6; j++)
            System.out.print("  " + (j+1)); 
        System.out.print("    ");
        for (int j = 6; j < 9; j++)
            System.out.print("  " + (j+1)); 
        System.out.print("      ");
        System.out.println();
        System.out.print("  +-----------+-----------+-----------+\n");
        char row_letter = 'A';
        for (int i = 0; i < 3; i++) {
            System.out.print(row_letter + " |"); 
            row_letter++;
            System.out.print("  " + board[i][0] + 
                             "  " + board[i][1] +
                             "  " + board[i][2] + "  |" + 
                             "  " + board[i][3] + 
                             "  " + board[i][4] +
                             "  " + board[i][5] + "  |" +
                             "  " + board[i][6] + 
                             "  " + board[i][7] +
                             "  " + board[i][8] + "  |");
            System.out.println("");
        }
        System.out.print("  +-----------+-----------+-----------+\n");
        for (int i = 3; i < 6; i++) {
            System.out.print(row_letter + " |"); 
            row_letter++;
            System.out.print("  " + board[i][0] + 
                             "  " + board[i][1] +
                             "  " + board[i][2] + "  |" + 
                             "  " + board[i][3] + 
                             "  " + board[i][4] +
                             "  " + board[i][5] + "  |" +
                             "  " + board[i][6] + 
                             "  " + board[i][7] +
                             "  " + board[i][8] + "  |");
            System.out.println("");
        }
        System.out.print("  +-----------+-----------+-----------+\n");
        for (int i = 6; i < 9; i++) {
            System.out.print(row_letter + " |"); 
            row_letter++;
            System.out.print("  " + board[i][0] + 
                             "  " + board[i][1] +
                             "  " + board[i][2] + "  |" + 
                             "  " + board[i][3] + 
                             "  " + board[i][4] +
                             "  " + board[i][5] + "  |" +
                             "  " + board[i][6] + 
                             "  " + board[i][7] +
                             "  " + board[i][8] + "  |");
            System.out.println("");
        }   
        System.out.print("  +-----------+-----------+-----------+\n");
    }

public static void main(String[] args) {
        int[][] board = new int[9][9];
        board[0][3] = 1;
        board[0][5] = 5;
        board[1][0] = 1;
        board[1][1] = 4;
        board[1][6] = 6;
        board[1][7] = 7;
        board[2][1] = 8;
        board[2][5] = 2;
        board[2][6] = 4;
        board[3][1] = 6;
        board[3][2] = 3;
        board[3][4] = 7;
        board[3][7] = 1;
        board[4][0] = 9;
        board[4][8] = 3;
        board[5][1] = 1;
        board[5][4] = 9;
        board[5][6] = 5;
        board[5][7] = 2;
        board[6][2] = 7;
        board[6][3] = 2;
        board[6][7] = 8;
        board[7][1] = 2;
        board[7][2] = 6;
        board[7][7] = 3;
        board[7][8] = 5;
        board[8][3] = 4;
        board[8][5] = 9;

我想知道如何使用像:"000005090140000670080002451063070010900000003007200080026000035000409060"这样的81位字符串要在某个位置为printboard指定值，0表示未解决。

Answer 1

严格回答问题，公式

81 / 9 * row + col

只要您使用零索引行和列，

将为您提供表示所需电路板位置的字符串中的字符位置。像

这样的东西

public String GetBoardValue(int row, int col)
{
    return boardString.CharAt(81 / 9 * row + col);
}

但要小心，这样的代码非常脆弱，容易破解。此处使用的数字81和9仅在字符串长度为81个字符时才起作用。编程中的“幻数”很糟糕。

正如马库斯所提到的，你需要考虑你想要在这里实现的目标。以这种方式表示董事会的纯字符串表示没有内在价值或意义。至少2D阵列是与Sudoku游戏板更紧密匹配的数据表示。但是，创建自己的对象来封装电路板数据并提供特定于Sudoku电路板的访问器将是一个更好的方法。它将赋予数据意义并且更容易使用。编程的目标是编写有意义的代码，以便读取代码的其他人理解它并可以使用它。因为在很多情况下，当你有一段时间没有看过这段代码时，那个人会在几个月后离开你。如果你花时间阅读代码只是为了理解你的意思，那么有更好的方法来编写代码。

如何将字符串中的值分配给2d数组？

1 个答案: