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Java Standard Edition (SE)

Iterator


compact1, compact2, compact3
java.util

Interface Iterator<E>

    • Method Summary

      All Methods Instance Methods Abstract Methods Default Methods 
      Modifier and Type Method and Description
      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.
      boolean hasNext()
      Returns true if the iteration has more elements.
      E next()
      Returns the next element in the iteration.
      default void remove()
      Removes from the underlying collection the last element returned by this iterator (optional operation).
    • Method Detail

      • 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

        E 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.
        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.
        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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