Implement the methods remove and set for the class MyListlterator. These methods should be...

Implement the methods remove and set for the class MyListlterator. These methods should behave as follows:

public void remove()

Removes from the list the last element that was returned by next or previous. This call can be made only once per call to next or previous. It can be made only if the add method in MyListlterator has not been called after the last call to next or previous.

Throws HlegalStateException if neither next nor previous has been called, or if remove or add has been called after the last call to next or previous.

public void set(T item)

Replaces the last element returned by next or previous with the specified element. This call can be made only if neither remove nor add have been called after the last call to next or previous.

Throws IllegalStateException if neither next nor previous has been called, or if remove or add has been called after the last call to next or previous.

Note that remove and set require you to keep track of the state of the iterator; in other words, you must know whedier or not next and previous are called immediately before the use of remove or set. You may also need to keep track of whether previous or next was called last to make sure that the correct element is deleted from or replaced in the list when remove and set are called. You may find it useful to use the variable .lastitemindex to determine if the last call made was to next or previous.