How to use

A list class is defined as follows:

Code :

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public class List {
 
 public Object first; 
 private List rest;
 private List(Object first, List rest){
  this.first = first;
  this.rest = rest;
 
 }
 
 public static List cons(Object first, List rest){
  return new List(first, rest);
 }
 
 public static Object first(List l){
  return l.first;
 
 }
 
 public static List rest(List l){
  return l.rest;
 }
}

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A Function interface is defined as follows,

Code :

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interface Function { Object call(Object o); }

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Wondering how to use tail-recursion with a helper function to create a map method which takes a list and a function object, returning a new list containing the results of calling the function's method call on each of the list's elements.