LinkedList.java

import java.util.function.Function;

public class WeirdLinkedList {
    public static Function<Boolean, Object> cons(Object head, Object tail) {
        return (Boolean cond) -> cond ? head : tail;
    }

    public static Object nth(Function<Boolean, Object> list, Integer n) {
        return n == 0 ? list.apply(true) : nth((Function<Boolean, Object>) list.apply(false), n - 1);
    }

    public static void printList(Function<Boolean, Object> list) {
        if (list != null) {
            System.out.print(list.apply(true));
            if (list.apply(false) != null) {
                System.out.print(",");
            }
            printList((Function<Boolean, Object>) list.apply(false));
        }
    }
}