Java8 List<String[]>到List<List<Integer>>

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        List<String[]> stringArray = Arrays.asList(
                new String[]{"1", "2", "3"},
                new String[]{"4", "5", "6"},
                new String[]{"7", "8", "9"}
        );

        List<List<Integer>> integerList = stringArray.stream()
                .map(arr -> Arrays.stream(arr)
                        .map(Integer::parseInt)
                        .collect(Collectors.toList()))
                .collect(Collectors.toList());

        System.out.println(integerList);
    }
}