打印从包含int和字符串的类派生的2D ArrayList

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        // 创建一个2D ArrayList
        ArrayList<ArrayList<Object>> data = new ArrayList<>();

        // 创建内层ArrayList，并添加数据
        ArrayList<Object> row1 = new ArrayList<>();
        row1.add(1);
        row1.add("Hello");
        data.add(row1);

        ArrayList<Object> row2 = new ArrayList<>();
        row2.add(2);
        row2.add("World");
        data.add(row2);

        // 打印2D ArrayList
        for (ArrayList<Object> row : data) {
            for (Object item : row) {
                System.out.print(item + " ");
            }
            System.out.println();
        }
    }
}

1 Hello 
2 World