import java.util.Scanner;
import java.lang.Math;
import java.util.ArrayList;
public class ArrayListDemonstration
{
  public static void main(String[] args)
  {
    ArrayList<Integer> list = new ArrayList<Integer>();
    // list == []
    list.add(42);
    // list == [42]
    list.add(2);
    // list == [42, 2]
    list.add(3);
    // list == [42, 2, 3]
    System.out.println(list.get(0)); // prints 42
    System.out.println(list.get(1)); // prints 2
    System.out.println(list.get(2)); // prints 3
    for (int i = 0; i < list.size(); i++)
    {
      System.out.println(list.get(i));
    }
    // has printed 42, 2 and 3
    
    // Now we go for multiple ArrayLists (yes, the "(ArrayList<Integer>[])" is Java weirdness).
    // Yes, this gives you a warning - blame Java.
    ArrayList<Integer>[] multipleArrayLists = (ArrayList<Integer>[]) new ArrayList[3];
    
    multipleArrayLists[0] = new ArrayList<Integer>();
    multipleArrayLists[1] = new ArrayList<Integer>();
    multipleArrayLists[2] = new ArrayList<Integer>();
    
    // multipleArrayLists == [[], [], []]
    multipleArrayLists[0].add(24);
    multipleArrayLists[2].add(2);
    multipleArrayLists[1].add(36);
    multipleArrayLists[2].add(88);
    multipleArrayLists[0].add(77);
    // multipleArrayLists == [[24, 77], [36], [2, 88]]
    System.out.println(multipleArrayLists[2].get(1)); // prints 88
  }
}