list of lists in java

/**
 * @author lautturi.com 
 * Java example: creating a list of lists in java
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {

		// Creating an empty Array list
		List<String> list1 = new ArrayList<String>();

		// Adding elements to List
		list1.add("java");
		list1.add("python");
		list1.add("js");
		list1.add("php");
		
		List<String> list2 = new ArrayList<String>();
		list2.add("hello");
		list2.add("world");
		
		ArrayList<List<String>> listOfLists = new ArrayList<List<String>>();

		listOfLists.add(list1);
		listOfLists.add(list2);

		System.out.println(list1);
		System.out.println(list2);
		System.out.println(listOfLists);
	}
}

output:

[java, python, js, php]
[hello, world]
[[java, python, js, php], [hello, world]]