Iterable (Java SE 26 & JDK 26)
Description: declaration: module: java.base, package: java.lang, interface: Iterable
Keywords: java.lang.Iterable interface

# Interface Iterable<T>

Type Parameters:
  `T` - the type of elements returned by the iterator

All Known Subinterfaces:
  `BeanContext, BeanContextServices, BlockingDeque<E>, BlockingQueue<E>, ClassModel, ClassReader, CodeAttribute, CodeModel, Collection<E>, CompoundElement<E>, ConstantPool, ConstantPoolBuilder, Deque<E>, DirectoryStream<T>, EventSet, FieldModel, List<E>, MethodModel, NavigableSet<E>, NodeSetData<T>, Path, Queue<E>, SecureDirectoryStream<T>, SequencedCollection<E>, SequencedSet<E>, Set<E>, SortedSet<E>, TransferQueue<E>, XPathNodes`

All Known Implementing Classes:
  `AbstractCollection, AbstractList, AbstractQueue, AbstractSequentialList, AbstractSet, ArrayBlockingQueue, ArrayDeque, ArrayList, AttributeList, BatchUpdateException, BeanContextServicesSupport, BeanContextSupport, ConcurrentHashMap.KeySetView, ConcurrentLinkedDeque, ConcurrentLinkedQueue, ConcurrentSkipListSet, CopyOnWriteArrayList, CopyOnWriteArraySet, DataTruncation, DelayQueue, DocTreePath, EnumSet, HashSet, JobStateReasons, LinkedBlockingDeque, LinkedBlockingQueue, LinkedHashSet, LinkedList, LinkedTransferQueue, PriorityBlockingQueue, PriorityQueue, RoleList, RoleUnresolvedList, RowSetWarning, SerialException, ServiceLoader, SQLClientInfoException, SQLDataException, SQLException, SQLFeatureNotSupportedException, SQLIntegrityConstraintViolationException, SQLInvalidAuthorizationSpecException, SQLNonTransientConnectionException, SQLNonTransientException, SQLRecoverableException, SQLSyntaxErrorException, SQLTimeoutException, SQLTransactionRollbackException, SQLTransientConnectionException, SQLTransientException, SQLWarning, Stack, SyncFactoryException, SynchronousQueue, SyncProviderException, TreePath, TreeSet, Vector`

public interface Iterable<T>
Implementing this interface allows an object to be the target of the enhanced `for` statement (sometimes called the "for-each loop" statement).

See Java Language Specification:
  14.14.2 The enhanced `for` statement
Since:
  1.5

- ## Method Summary

  Modifier and Type
  Method
  Description
  `default void`
  `forEach(Consumer<? super T> action)`
  Performs the given action for each element of the `Iterable` until all elements have been processed or the action throws an exception.
  `Iterator<T>`
  `iterator()`
  Returns an iterator over elements of type `T`.
  `default Spliterator<T>`
  `spliterator()`
  Creates a `Spliterator` over the elements described by this `Iterable`.

- ## Method Details

  - ### iterator

    Iterator<T> iterator()
    Returns an iterator over elements of type `T`.
    Returns:
      an Iterator.

  - ### forEach

    default void forEach(Consumer<? super T> action)
    Performs the given action for each element of the `Iterable` 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 this method is unspecified if the action performs side-effects that modify the underlying source of elements, unless an overriding class has specified a concurrent modification policy.

    Implementation Requirements:

      The default implementation behaves as if:

              for (T t : this)
                  action.accept(t);

    Parameters:
      `action` - The action to be performed for each element
    Throws:
      `NullPointerException` - if the specified action is null
    Since:
      1.8

  - ### spliterator

    default Spliterator<T> spliterator()
    Creates a `Spliterator` over the elements described by this `Iterable`.
    Implementation Requirements:
      The default implementation creates an early-binding spliterator from the iterable's `Iterator`. The spliterator inherits the fail-fast properties of the iterable's iterator.
    Implementation Note:
      The default implementation should usually be overridden. The spliterator returned by the default implementation has poor splitting capabilities, is unsized, and does not report any spliterator characteristics. Implementing classes can nearly always provide a better implementation.
    Returns:
      a `Spliterator` over the elements described by this `Iterable`.
    Since:
      1.8