Module java.base
Package java.lang

Interface Iterable<T>

Type Parameters:
T - the type of elements returned by the iterator
All Known Subinterfaces:
BeanContext, BeanContextServices, BlockingDeque<E>, BlockingQueue<E>, Collection<E>, Deque<E>, DirectoryStream<T>, EventSet, List<E>, NavigableSet<E>, NodeSetData<T>, Path, Queue<E>, SecureDirectoryStream<T>, 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