Question

尝试为数独板创建数据结构，我想将其打印到控制台以供初学者使用。我正在使用一个二维数组来表示数独游戏中的每个单元格，而且我有一个真正的nooby问题打印出来。

public class Main {

public static void main(String[] args) {

    int[][] puzzleBoard = {};

    //Row 1
    puzzleBoard[1][1] = 0;
    puzzleBoard[2][1] = 0;
    puzzleBoard[3][1] = 0;
    puzzleBoard[4][1] = 0;
    puzzleBoard[5][1] = 0;
    puzzleBoard[6][1] = 0;
    puzzleBoard[7][1] = 0;
    puzzleBoard[8][1] = 0;
    puzzleBoard[9][1] = 0;

    //Row 2
    puzzleBoard[1][2] = 0;
    puzzleBoard[2][2] = 0;
    puzzleBoard[3][2] = 0;
    puzzleBoard[4][2] = 0;
    puzzleBoard[5][2] = 0;
    puzzleBoard[6][2] = 0;
    puzzleBoard[7][2] = 0;
    puzzleBoard[8][2] = 0;
    puzzleBoard[9][2] = 0;

    //Row 3
    puzzleBoard[1][3] = 0;
    puzzleBoard[2][3] = 0;
    puzzleBoard[3][3] = 0;
    puzzleBoard[4][3] = 0;
    puzzleBoard[5][3] = 0;
    puzzleBoard[6][3] = 0;
    puzzleBoard[7][3] = 0;
    puzzleBoard[8][3] = 0;
    puzzleBoard[9][3] = 0;

    //Row 4
    puzzleBoard[1][4] = 0;
    puzzleBoard[2][4] = 0;
    puzzleBoard[3][4] = 0;
    puzzleBoard[4][4] = 0;
    puzzleBoard[5][4] = 0;
    puzzleBoard[6][4] = 0;
    puzzleBoard[7][4] = 0;
    puzzleBoard[8][4] = 0;
    puzzleBoard[9][4] = 0;

    //Row 5
    puzzleBoard[1][5] = 0;
    puzzleBoard[2][5] = 0;
    puzzleBoard[3][5] = 0;
    puzzleBoard[4][5] = 0;
    puzzleBoard[5][5] = 0;
    puzzleBoard[6][5] = 0;
    puzzleBoard[7][5] = 0;
    puzzleBoard[8][5] = 0;
    puzzleBoard[9][5] = 0;

    //Row 6
    puzzleBoard[1][6] = 0;
    puzzleBoard[2][6] = 0;
    puzzleBoard[3][6] = 0;
    puzzleBoard[4][6] = 0;
    puzzleBoard[5][6] = 0;
    puzzleBoard[6][6] = 0;
    puzzleBoard[7][6] = 0;
    puzzleBoard[8][6] = 0;
    puzzleBoard[9][6] = 0;

    //Row 7
    puzzleBoard[1][7] = 0;
    puzzleBoard[2][7] = 0;
    puzzleBoard[3][7] = 0;
    puzzleBoard[4][7] = 0;
    puzzleBoard[5][7] = 0;
    puzzleBoard[6][7] = 0;
    puzzleBoard[7][7] = 0;
    puzzleBoard[8][7] = 0;
    puzzleBoard[9][7] = 0;

    //Row 8
    puzzleBoard[1][8] = 0;
    puzzleBoard[2][8] = 0;
    puzzleBoard[3][8] = 0;
    puzzleBoard[4][8] = 0;
    puzzleBoard[5][8] = 0;
    puzzleBoard[6][8] = 0;
    puzzleBoard[7][8] = 0;
    puzzleBoard[8][8] = 0;
    puzzleBoard[9][8] = 0;

    //Row 9
    puzzleBoard[1][9] = 0;
    puzzleBoard[2][9] = 0;
    puzzleBoard[3][9] = 0;
    puzzleBoard[4][9] = 0;
    puzzleBoard[5][9] = 0;
    puzzleBoard[6][9] = 0;
    puzzleBoard[7][9] = 0;
    puzzleBoard[8][9] = 0;
    puzzleBoard[9][9] = 0;

    int rows = 9;
    int columns = 9;

    int i, j;

    for (i = 1; i < rows; i++){
        for(j = 1; j < columns; j++){
            System.out.print(puzzleBoard[i][j] + " ");

        }
        System.out.println( "" );
    }
}

}

Answer 1

您没有为数组指定大小。

int[][] puzzleBoard = {};应为int[][] puzzleBoard = new int[10][10];

如果只填充0，则无需使用for循环或逐行初始化数组。

然后数组被0索引。因此，第一个元素位于[0][0]位置，最后一个元素位于位置[9][9]。

您还可以删除两个变量rows和columns。

最后，你应该修改你的for循环从0开始。

for (i = 0; i < puzzleBoard.length; i++){
        for(j = 0; j < puzzleBoard[i].length; j++){
            System.out.print(puzzleBoard[i][j] + " ");    
        }
        System.out.println( "" );
    }

要了解有关Java中数组的更多信息，建议您阅读this。

Answer 2

您也应该使用for循环初始化数组元素！

另外，请记住，Java数组是基于零的，所以最顶层的单元格是puzzleboard[0][0]！

您还应指定数组的大小 - int[][] puzzleBoard = new int[10][10];

Answer 3

您应该使用java.util.Arrays.deepToString()打印2D数组：

返回＆＃34;深度内容＆＃34;的字符串表示形式。的   指定的数组。如果数组包含其他数组作为元素，则   字符串表示包含其内容等。这种方法   用于将多维数组转换为字符串。

字符串表示由数组元素的列表组成，   用方括号括起来（＆＃34; []＆＃34;）。相邻的元素是分开的   人物＆＃34;，＆＃34; （逗号后跟空格）。元素是   通过String.valueOf（Object）转换为字符串，除非它们是   他们自己的数组。

如何打印出我的二维数组？

3 个答案: