Recursive multiplyByTwo

Main.java

public class Main
{
    public static void main(String[] args)
    {
        List list = List.EMPTY_LIST;
        
        int n = 6000;
        while(n > 0)
            list = list.cons(n--);
        
        list = multiplyByTwo(list);
    }
    
    private static List multiplyByTwo(List list)
    {
        if(list.isEmpty())
        {
            return list;
        }
        else
        {
            return multiplyByTwo(list.tail()).cons(2 * list.head());
        }
    }
}