import java.util.ArrayList;

public class AddToPos
{
    public static void main(String[] args)
    {
        ArrayList<String> myList = new ArrayList<>();
        
        myList.add("john");  // Position 0
        myList.add("mary");  // Position 1
        myList.add("peter"); // Position 2

        myList.add(1, "peter");  // Insert it at position 1 

        System.out.println( myList ); // [john,peter,mary,peter]
    }
}