将嵌套的List<List<T>>转换为嵌套的ArrayList<ArrayList<T>>

import java.util.ArrayList;
import java.util.List;

public class ListConversion {
    public static <T> ArrayList<ArrayList<T>> convertNestedList(List<List<T>> nestedList) {
        ArrayList<ArrayList<T>> convertedList = new ArrayList<>();

        for (List<T> list : nestedList) {
            ArrayList<T> convertedSubList = new ArrayList<>(list);
            convertedList.add(convertedSubList);
        }

        return convertedList;
    }
}

import java.util.Arrays;
import java.util.List;

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

        ArrayList<ArrayList<Integer>> convertedList = ListConversion.convertNestedList(nestedList);

        for (ArrayList<Integer> list : convertedList) {
            System.out.println(list);
        }
    }
}

[1, 2, 3]
[4, 5]
[6, 7, 8, 9]