PYTHON

list in list python

l1 = [1,2,3]
l2 = [4,5,6]
l3 = [7,8,9]

lst = []

lst.append(l1)
lst.append(l2)
lst.append(l3)
print(lst)

List in list

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

list in list

import java.util.*;

public class JavaHungry
{
    public static void main(String[] args)
    {
        // Create listOfLists in Java
        List<List<Integer>> listOfLists = new ArrayList<>();
        
        // Creating innerList 
        List<Integer> innerList = new ArrayList<>();
        
        // Adding elements to innerList
        innerList.add(1);
        innerList.add(2);
        innerList.add(3);
        
        // Adding innerList to listOfLists
        listOfLists.add(innerList);
        
        // Creating another inner list 
        List<Integer> innerList2 = new ArrayList<>();
        
        // Adding elements to innerList2
        innerList2.add(100);
        innerList2.add(101);
        innerList2.add(102);
        
        // Adding innerList2 to listOfLists
        listOfLists.add(innerList2);        

        // Printing listOfLists elements
        System.out.println(listOfLists);
    }
}