Tail-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);
    }
    
    public static List multiplyByTwo(List list)
    {
        return multiplyByTwo(list, List.EMPTY_LIST);
    }
    
    public static List multiplyByTwo(List list, List doubledList)
    {
        if(list.isEmpty())
        {
            return doubledList.reverse();
        }
        else
        {
            return multiplyByTwo(list.tail(), doubledList.cons(2 * list.head()));
        }
    }
}