Any help would be appreciated! TIA!

$-$CompletedList: A class that represents a doubly linked structure, with functionality to remove nodes. Must implement ListADT and Iterable.

$-$ListIterator: A class that provides an iterator for iterating over your array or linked implementation of CompletedList. This should be implemented as a private inner class within the CompletedList class. Must implements Iterator. Make sure that your implementation of hasNext$()$ throws ConcurrentModicationException when appropriate, next$()$ throws NoSuchElementException when appropriate, and remove$()$ throws UnsupportedOperationException. Hint: Since the attached source code doesn't have the Iterator interface, look it up by searching "java $9$ Iterator interface", it should be the first result!

$-$CompletedOrderedList: A class that extends the functionality from CompletedList by adding a method to add new elements. Must extend CompletedList and and implement OrderedListADT