如何使用Java8流将多维字符串数组(String[][])转换为多维双精度数组(double[][])？

import java.util.Arrays;
import java.util.stream.Stream;

public class Main {
    public static void main(String[] args) {
        String[][] stringArray = {{"1.0", "2.0", "3.0"}, {"4.0", "5.0", "6.0"}};

        String[] flattenedArray = Arrays.stream(stringArray)
                .flatMap(Arrays::stream)
                .toArray(String[]::new);

        double[] doubleArray = Arrays.stream(flattenedArray)
                .mapToDouble(Double::parseDouble)
                .toArray();

        int rows = stringArray.length;
        int columns = stringArray[0].length;
        double[][] result = new double[rows][columns];
        int index = 0;
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < columns; j++) {
                result[i][j] = doubleArray[index++];
            }
        }

        System.out.println(Arrays.deepToString(result));
    }
}