You should create a class called yoursimplelinkedlist that inherits from simplelinkedlist and provide a complete implementation of remove. if the index is valid remove returns a reference to the object that was removed. otherwise it returns null and does not alter the list. you may want to look at the implementation of getitem in simplelinkedlist for a reminder of how to walk a linked list using a for loop. we have provided a constructor for yoursimplelinkedlist that takes an array of object references and simply passes them to a call to super to properly initialize simplelinkedlist.