Difference between Iterator and Listiterator

Question

Iterator ite   Set iterator    Iterator ite   List iterator     ListIterator listite   List listIterator      We can use Iterator to traverse a Set or a List or a Map  But ListIterator can only be used to traverse a List  it can t traverse a Set  Why   I know that the main difference is that with iterator we can travel in only one direction but with ListIterator we can travel both directions  Are there any other differences  And any advantages of ListIterator over Iterator

User · Accepted Answer

The differences are listed in the Javadoc for ListIterator  You can   iterate backwards obtain the iterator at any point  add a new value at any point  set a new value at that point

User · Answer

the following is that the difference between iterator and listIterator iterator   boolean hasNext    E next    void remove     listIterator  boolean hasNext    E next    boolean hasPrevious    E previous    int nextIndex    int previousIndex    void remove    void set E e   void add E e

User · Answer

Iterator is super class of ListIterator    Here are the differences between them    With iterator you can move only forward  but with ListIterator you can move backword also while reading the elements  With ListIterator you can obtain the index at any point while traversing  which is not possible with iterators  With iterator you can check only for next element available or not  but in listiterator you can check previous and next elements  With listiterator you can add new element at any point of time  while traversing  Not possible with iterator  With listiterator you can modify an element while traversing  which is not possible with iterator    Iterator look and feel    public interface Iterator lt E gt        boolean hasNext        E next        void remove      optional-- gt use only once with next                              dont use it when u use for each         ListIterator look and feel   public interface ListIterator lt E gt  extends Iterator lt E gt        boolean hasNext        E next        boolean hasPrevious        E previous        int nextIndex        int previousIndex        void remove      optional     void set E e     optional     void add E e     optional

User · Answer

There are two differences    We can use Iterator to traverse Set and List and also Map type of Objects  While a ListIterator can be used to traverse for List-type Objects  but not for Set-type of Objects   That is  we can get a Iterator object by using Set and List  see here   By using Iterator we can retrieve the elements from Collection Object in forward direction only   Methods in Iterator    hasNext   next   remove     Iterator iterator   Set iterator    Iterator iterator   List iterator    But we get ListIterator object only from the List interface  see here   where as a ListIterator allows you to traverse in either directions  Both forward and backward   So it has two more methods like hasPrevious   and  previous   other than  those of Iterator  Also  we can get indexes of the next or previous elements  using nextIndex    and previousIndex   respectively    Methods in ListIterator    hasNext   next   previous   hasPrevious   remove   nextIndex   previousIndex     ListIterator listiterator   List listIterator     i e   we can t get ListIterator object from Set interface    Reference   - What is the difference between Iterator and ListIterator

[java] Difference between Iterator and Listiterator?

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