的java多维数组移调 [英] java multi-dimensional array transposing

问题描述

我有一个基于行的多维数组：

I have a row-based multidimensional array:

/** [row][column]. */
public int[][] tiles;

我想这个数组转换为基于列的阵列，像下面这样：

I would like to transform this array to column-based array, like following:

/** [column][row]. */
public int[][] tiles;

...但我真的不知道从哪里开始。

...But I really don't know where to start

推荐答案

试试这个：

@Test
    public void transpose() {

        final int[][] original = new int[][] { { 1, 2, 3, 4 }, { 5, 6, 7, 8 }, { 9, 10, 11, 12 } };
        for (int i = 0; i < original.length; i++) {
            for (int j = 0; j < original[i].length; j++) {
                System.out.print(original[i][j] + " ");
            }
            System.out.print("\n");
        }
        System.out.print("\n\n matrix transpose:\n");
        // transpose
        if (original.length > 0) {
            for (int i = 0; i < original[0].length; i++) {
                for (int j = 0; j < original.length; j++) {
                    System.out.print(original[j][i] + " ");
                }
                System.out.print("\n");
            }
        }
    }

输出：

1 2 3 4 
5 6 7 8 
9 10 11 12 


 matrix transpose:
1 5 9 
2 6 10 
3 7 11 
4 8 12 

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