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Showing content from https://docs.oracle.com/en/java/javase/20/docs/api/java.base/java/util/Iterator.html below:

Iterator (Java SE 20 & JDK 20)

Type Parameters:

E - the type of elements returned by this iterator

All Known Subinterfaces:

EventIterator, ListIterator<E>, PrimitiveIterator<T,T_CONS>, PrimitiveIterator.OfDouble, PrimitiveIterator.OfInt, PrimitiveIterator.OfLong, XMLEventReader

All Known Implementing Classes:

BeanContextSupport.BCSIterator, EventReaderDelegate, Scanner

public interface Iterator<E>

An iterator over a collection.

takes the place of

in the Java Collections Framework. Iterators differ from enumerations in two ways:

• Iterators allow the caller to remove elements from the underlying collection during the iteration with well-defined semantics.
• Method names have been improved.

This interface is a member of the Java Collections Framework.

API Note:

An Enumeration can be converted into an Iterator by using the Enumeration.asIterator() method.

Since:

1.2

See Also:

• Collection
• ListIterator
• Iterable

• Method Summary

  default void

  Performs the given action for each remaining element until all elements have been processed or the action throws an exception.

  boolean

  Returns true if the iteration has more elements.

  Returns the next element in the iteration.

  default void

  Removes from the underlying collection the last element returned by this iterator (optional operation).

• Method Details
  • hasNext

    boolean hasNext()

    Returns

    true

    if the iteration has more elements. (In other words, returns

    true

    if

    next()

    would return an element rather than throwing an exception.)

    Returns:

    true if the iteration has more elements

  • next

    Returns the next element in the iteration.

    Returns:

    the next element in the iteration

    Throws:

    NoSuchElementException - if the iteration has no more elements

  • remove

    default void remove()

    Removes from the underlying collection the last element returned by this iterator (optional operation). This method can be called only once per call to

    next()

    .

    The behavior of an iterator is unspecified if the underlying collection is modified while the iteration is in progress in any way other than by calling this method, unless an overriding class has specified a concurrent modification policy.

    The behavior of an iterator is unspecified if this method is called after a call to the forEachRemaining method.

    Implementation Requirements:

    The default implementation throws an instance of UnsupportedOperationException and performs no other action.

    Throws:

    UnsupportedOperationException - if the remove operation is not supported by this iterator

    IllegalStateException - if the next method has not yet been called, or the remove method has already been called after the last call to the next method

  • forEachRemaining default void forEachRemaining(Consumer<? super E> action)

    Performs the given action for each remaining element until all elements have been processed or the action throws an exception. Actions are performed in the order of iteration, if that order is specified. Exceptions thrown by the action are relayed to the caller.

    The behavior of an iterator is unspecified if the action modifies the collection in any way (even by calling the remove method or other mutator methods of Iterator subtypes), unless an overriding class has specified a concurrent modification policy.

    Subsequent behavior of an iterator is unspecified if the action throws an exception.

    Implementation Requirements:

    The default implementation behaves as if:

    
         while (hasNext())
             action.accept(next());
     

    Parameters:

    action - The action to be performed for each element

    Throws:

    NullPointerException - if the specified action is null

    Since:

    1.8

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