could i get help building these methods in java please

iterator

public java.util.ListIterator iterator() throws java.lang.UnsupportedOperationException, java.util.NoSuchElementException

This method must be implemented using an inner class that implements ListIterator and defines the methods of hasNext(), next(), hasPrevious() and previous(). Remember that we should be able to call the hasNext() method as many times as we want without changing what is considered the next element.

Specified by:

iterator in interface java.lang.Iterable

Throws:

java.util.NoSuchElementException - Your next() method should throw NoSuchElementException if there are no more elements (at the end of the list and calling next() or at the beginning of the list and calling previous()).

java.lang.UnsupportedOperationException - You don't need to implement the ListIterator's remove(), add(), nextIndex() and previousIndex() and set() methods, throw UnsupportedOperationException if called.

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remove

public BasicDoubleLinkedList remove(T targetData, java.util.Comparator comparator)

Removes the first instance of the targetData from the list. Notice that you must remove the elements by performing a single traversal over the list. You may not use any of the other retrieval methods associated with the class in order to complete the removal process. You must use the provided comparator (do not use equals) to find those elements that match the target. Do not implement this method using iterators.

Parameters:

targetData - the data element to be removed

comparator - the comparator to determine equality of data elements

Returns:

data element or null

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retrieveFirstElement

public T retrieveFirstElement()

Removes and returns the first element from the list. If there are no elements the method returns null. Do not implement this method using iterators.

Returns:

data element or null

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retrieveLastElement

 public T retrieveLastElement()

Removes and returns the last element from the list. If there are no elements the method returns null. Do not implement implement this method using iterators.

Returns:

data element or null

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toArrayList

public java.util.ArrayList toArrayList()

Returns an arraylist of the items in the list from head of list to tail of list

Returns:

an arraylist of the items in the list