a49multiDimAl.java

import java.util.ArrayList;

public class a49multiDimAl {
    public static void main(String[] args) {
        ArrayList<ArrayList<Integer>> mainList = new ArrayList<>();
        ArrayList list1 = new ArrayList<>();
        ArrayList list2 = new ArrayList<>();
        ArrayList list3 = new ArrayList<>();

        for (int i = 1; i <= 5; i++) {
            list1.add(i*1);
            list2.add(i*2);
            list3.add(i*3);
        }
        
        mainList.add(list1);
        mainList.add(list2);
        mainList.add(list3);

        // System.out.println(mainList);

        for (int i = 0; i < mainList.size(); i++) {
            ArrayList<Integer> currList = mainList.get(i);
            for(int j=0; j<currList.size(); j++){
                System.out.print(currList.get(j)+" ");
            }
            System.out.println();
        }
    }
}