/** * @author lautturi.com * Java example: creating a list of lists in java */ import java.util.*; public class Lautturi { public static void main(String[] args) { ArrayList<List<Integer>> listOfLists = new ArrayList<List<Integer>>(); List<Integer> list1 = new ArrayList<Integer>(); list1.add(1); list1.add(2); listOfLists.add(list1); List<Integer> list2 = new ArrayList<Integer>(); list2.add(3); list2.add(4); listOfLists.add(list2); System.out.println("list1:" + list1); System.out.println("list2:" + list2); System.out.println("listOfLists:" + listOfLists); } }
output:
list1:[1, 2] list2:[3, 4] listOfLists:[[1, 2], [3, 4]]