Package java.util

Interface ListIterator<E>

All Superinterfaces:
Iterator<E>
public interface ListIterator<E>
extends Iterator<E>
An ListIterator is used to sequence over a List of objects. ListIterator can move backwards or forwards through the list.

  • Method Summary

    Modifier and Type Method Description
    void add​(E object)
    Inserts the specified object into the list between next and previous.
    boolean hasNext()
    Returns whether there are more elements to iterate.
    boolean hasPrevious()
    Returns whether there are previous elements to iterate.
    E next()
    Returns the next object in the iteration.
    int nextIndex()
    Returns the index of the next object in the iteration.
    E previous()
    Returns the previous object in the iteration.
    int previousIndex()
    Returns the index of the previous object in the iteration.
    void remove()
    Removes the last object returned by next or previous from the list.
    void set​(E object)
    Replaces the last object returned by next or previous with the specified object.

  • Method Details

    • add

      void add​(E object)
      Inserts the specified object into the list between next and previous. The object inserted will be the previous object.
      Parameters:
      object - the object to insert.
      Throws:
      UnsupportedOperationException - if adding is not supported by the list being iterated.
      ClassCastException - if the class of the object is inappropriate for the list.
      IllegalArgumentException - if the object cannot be added to the list.

    • hasNext

      boolean hasNext()
      Returns whether there are more elements to iterate.
      Specified by:
      hasNext in interface Iterator<E>
      Returns:
      true if there are more elements, false otherwise.
      See Also:
      next()

    • hasPrevious

      boolean hasPrevious()
      Returns whether there are previous elements to iterate.
      Returns:
      true if there are previous elements, false otherwise.
      See Also:
      previous()

    • next

      E next()
      Returns the next object in the iteration.
      Specified by:
      next in interface Iterator<E>
      Returns:
      the next object.
      Throws:
      NoSuchElementException - if there are no more elements.
      See Also:
      hasNext()

    • nextIndex

      int nextIndex()
      Returns the index of the next object in the iteration.
      Returns:
      the index of the next object, or the size of the list if the iterator is at the end.
      Throws:
      NoSuchElementException - if there are no more elements.
      See Also:
      next()

    • previous

      E previous()
      Returns the previous object in the iteration.
      Returns:
      the previous object.
      Throws:
      NoSuchElementException - if there are no previous elements.
      See Also:
      hasPrevious()

    • previousIndex

      int previousIndex()
      Returns the index of the previous object in the iteration.
      Returns:
      the index of the previous object, or -1 if the iterator is at the beginning.
      Throws:
      NoSuchElementException - if there are no previous elements.
      See Also:
      previous()

    • remove

      void remove()
      Removes the last object returned by next or previous from the list.
      Specified by:
      remove in interface Iterator<E>
      Throws:
      UnsupportedOperationException - if removing is not supported by the list being iterated.
      IllegalStateException - if next or previous have not been called, or remove or add have already been called after the last call to next or previous.

    • set

      void set​(E object)
      Replaces the last object returned by next or previous with the specified object.
      Parameters:
      object - the object to set.
      Throws:
      UnsupportedOperationException - if setting is not supported by the list being iterated
      ClassCastException - if the class of the object is inappropriate for the list.
      IllegalArgumentException - if the object cannot be added to the list.
      IllegalStateException - if next or previous have not been called, or remove or add have already been called after the last call to next or previous.