Question

当我键入1 1时，它将用H代替1 1中的N。我该如何更换？当我输入1时，我有读者x和Y，然后再输入1，它将用H替换N

    String[][] board = {
            { "N", "N", "N", "N", "N" },
            { "N", "N", "N", "N", "N" },
            { "N", "N", "N", "N", "N" },
            { "N", "N", "N", "N", "N" },
            { "N", "N", "N", "N", "N" }
    };

    for (int i = 0; i < board.length; i++) {
        System.out.print(board.length - i + " ");
        for (int j = 0; j < board[i].length; j++) {
            System.out.print(board[i][j] + " ");
        }
        if(i == board.length - 1) {
            System.out.println("");
            System.out.print(" ");
            for(int k = 1; k < board[i].length + 1; k++) {
                System.out.print(" " + k);
            }
        }
        System.out.println("");
    }

    System.out.print("Please enter position X: ");
    Scanner inputx = new Scanner(System.in);
    int readerx = inputx.nextInt();

    System.out.print("Please enter position Y: ");
    Scanner inputy = new Scanner(System.in);
    int readery = inputy.nextInt();

    /*replace board[readerx - 1][readery - 1] with H*/

Answer 1

我编写了代码，但是从输出中看到的是您可能错误地对数组索引进行了编号。垂直按5 4 3 2 1顺序打印。如果您故意这样做，那么您可以共享所需的输出，那么我就可以更改答案。

如下更改代码：

public class Main {
    public static void main(String[] args) throws IOException {
        String[][] board = {
                { "N", "N", "N", "N", "N" },
                { "N", "N", "N", "N", "N" },
                { "N", "N", "N", "N", "N" },
                { "N", "N", "N", "N", "N" },
                { "N", "N", "N", "N", "N" }
        };

        printArray(board);

        System.out.print("Please enter position X: ");
        Scanner inputx = new Scanner(System.in);
        int readerx = inputx.nextInt();

        System.out.print("Please enter position Y: ");
        Scanner inputy = new Scanner(System.in);
        int readery = inputy.nextInt();

        board[readerx][readery] = "H";

        printArray(board);
    }

    private static void printArray(String[][] board) {
        for (int i = 0; i < board.length; i++) {
            System.out.print(board.length - i + " ");
            for (int j = 0; j < board[i].length; j++) {
                System.out.print(board[i][j] + " ");
            }
            if(i == board.length - 1) {
                System.out.println("");
                System.out.print(" ");
                for(int k = 1; k < board[i].length + 1; k++) {
                    System.out.print(" " + k);
                }
            }
            System.out.println("");
        }
    }
}

输出为：

5 N N N N N 
4 N N N N N 
3 N N N N N 
2 N N N N N 
1 N N N N N 
  1 2 3 4 5
Please enter position X: 1
Please enter position Y: 1
5 N N N N N 
4 N H N N N // here it changed
3 N N N N N 
2 N N N N N 
1 N N N N N 
  1 2 3 4 5

编辑：如果您希望当前的索引顺序，则应使用下面的补货代码，该代码首先计算目标数组：

int targetArray = board.length - readerx;
board[targetArray][readery - 1] = "H";

如何在Java中替换数组

1 个答案: