Question

我正在使用java，我想根据用户输入多次水平打印2d数组。但是，我的阵列垂直打印，有人可以帮忙吗？

    n=3; //user input
    char[][] board = new char[2][3];
    char[][] f = new char[board.length][n * board[0].length];
    for (int i = 1; i < n + 1; i++) {
        int Start = (i * board[0].length) - board[0].length;
        int End = i * board[0].length;
        for (int row = 0; row < f.length; row++) {
            for (int col = nStart; col < nEnd; col++) {
                f[row][col] = board[row][col - nStart];
                System.out.print(f[row][col]);
            }
            System.out.println();
        }
    } 
For example board array = 
xx
xx
I would like 
xxxxxx
xxxxxx

Answer 1

如果要水平打印2d数组，则必须在下一行之前重复打印行n次：

int n = 3; // user input
char[][] board = new char[][] { { 'x', 'x', 'x' }, { '0', '0', '0' } }; //example board

for (int row = 0; row < board.length; row++)
{
    for (int i = 0; i < n; i++)
    {
        for (int col = 0; col < board[row].length; col++)
        {
            System.out.print(board[row][col]);
        }
        System.out.print("\t"); //arrays separated by tab
    }
    System.out.println();
}

输出：

xxx xxx xxx 
000 000 000

我希望这有帮助。

Answer 2

您的解决方案工作正常，只是您在代码的最后几行中犯了一点错误。我想你想使用 System.out.println（）在每个条目之间打印一个空格，但 println 会在最后打印一个换行符。所以你的代码应该是这样的：

n=3; //user input
char[][] board = new char[2][3];
char[][] f = new char[board.length][n * board[0].length];
for (int i = 1; i < n + 1; i++) {
    int Start = (i * board[0].length) - board[0].length;
    int End = i * board[0].length;
    for (int row = 0; row < f.length; row++) {
        for (int col = nStart; col < nEnd; col++) {
            f[row][col] = board[row][col - nStart];
            System.out.print(f[row][col]);
        }
        System.out.print(" "); // Print a space between every single output
    }
}

或者，如果你不想要一个空间完全删除线。或者将空格更改为逗号，点或任何您需要的内容。

Answer 3

删除复制的数组f。你需要的是交换row，col in循环。

n=3; //user input
char[][] board = new char[2][3];
for (int j = 0; j < board[0].length; j++) {
    for (int i = 0; i < n ; i++) {
            System.out.print(board[i][j]);
            System.out.print(" ");
    }
    System.out.println();
}

如何多次水平打印2d数组

3 个答案: