Interface Iterator<E>

Type Parameters:
E - the type of object returned by the iterator.
All Known Subinterfaces:
ListIterator<E>
All Known Implementing Classes:
Form.TabIterator
public interface Iterator<E>
An Iterator is used to sequence over a collection of objects. Conceptually, an iterator is always positioned between two elements of a collection. A fresh iterator is always positioned in front of the first element. If a collection has been changed since its creation, methods next and hasNext() may throw a ConcurrentModificationException. Iterators with this behavior are called fail-fast iterators.

  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    hasNext()
    Returns whether there are more elements to iterate, i.e.
    E
    next()
    Returns the next object in the iteration, i.e.
    void
    remove()
    Removes the last object returned by next from the collection.

  • Method Details

    • hasNext

      boolean hasNext()
      Returns whether there are more elements to iterate, i.e. whether the iterator is positioned in front of an element.
      Returns:
      true if there are more elements, false otherwise.
      See Also:

    • next

      E next()
      Returns the next object in the iteration, i.e. returns the element in front of the iterator and advances the iterator by one position.
      Returns:
      the next object.
      Throws:
      NoSuchElementException - if there are no more elements.
      See Also:

    • remove

      void remove()
      Removes the last object returned by next from the collection. This method can only be called once after next was called.
      Throws:
      UnsupportedOperationException - if removing is not supported by the collection being iterated.
      IllegalStateException - if next has not been called, or remove has already been called after the last call to next.