使用Java从文件中加载带有嵌套ArrayLists的ArrayList

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;

public class ArrayListLoader {
    public static ArrayList<ArrayList<String>> loadArrayListFromFile(String filePath) {
        ArrayList<ArrayList<String>> nestedArrayList = new ArrayList<>();

        try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
            String line;
            while ((line = reader.readLine()) != null) {
                ArrayList<String> innerArrayList = new ArrayList<>();
                String[] data = line.split(","); // 根据实际数据格式进行分割
                for (String item : data) {
                    innerArrayList.add(item.trim()); // 根据实际数据格式进行处理
                }
                nestedArrayList.add(innerArrayList);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        return nestedArrayList;
    }

    public static void main(String[] args) {
        String filePath = "data.txt"; // 替换为实际文件路径
        ArrayList<ArrayList<String>> result = ArrayListLoader.loadArrayListFromFile(filePath);
        System.out.println(result);
    }
}