Iterator

Type Parameters:

E - the type of elements returned by this iterator

All Known Subinterfaces:

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. Iterator takes the place of Enumeration 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.
Since:

1.2

See Also:

Collection, ListIterator, Iterable

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

Interface Iterator<E>

Method Summary

Method Detail

hasNext

next

remove

forEachRemaining