java multi-dimensional array transposing

Question

I have a row-based multidimensional array:

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

I would like to transform this array to column-based

Answer 1

Use this function (replace String by int if necessary). It takes the matrix as string array and returns a new matrix which is the transpose. It checks for the edge case of an empty array, too. No prints.

private String[][] transposeTable(String[][] table) {
    // Transpose of empty table is empty table
    if (table.length < 1) {
        return table;
    }

    // Table isn't empty
    int nRows = table.length;
    int nCols = table[0].length;
    String[][] transpose = new String[nCols][nRows];

    // Do the transpose
    for (int i = 0; i < nRows; i++) {
        for (int j = 0; j < nCols; j++) {
            transpose[j][i] = table[i][j];
        }
    }

    return transpose;
}