import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

public class MultiDArrayList {

public static void main(String[] args) {

List<List<Integer>> mainlist = new ArrayList<>();

List<Integer> list1 = new ArrayList<>(Arrays.asList(1, 2, 3, 4, 5));

List<Integer> list2 = new ArrayList<>(Arrays.asList(2, 4, 6, 8, 10));

List<Integer> list3 = new ArrayList<>(Arrays.asList(3, 6, 9, 12, 15));

mainlist.add(list1);

mainlist.add(list2);

mainlist.add(list3);

// Print the list

System.out.println(mainlist);

System.out.println("----------------------------------------------------------------");

// Printing the element of list

for (int i = 0; i < mainlist.size(); i++) {

List<Integer> list = mainlist.get(i);

for (int j = 0; j < list.size(); j++) {

System.out.print(list.get(j) + " ");

}

System.out.println();

}

}

}