Iterator

Type Parameters:

E - the type of object returned by the iterator.

All Known Subinterfaces:

ListIterator<E>
```
public interface Iterator<E>
```
An iterator over a sequence of objects, such as a collection.
If a collection has been changed since the iterator was created, methods next and hasNext() may throw a ConcurrentModificationException. It is not possible to guarantee that this mechanism works in all cases of unsynchronized concurrent modification. It should only be used for debugging purposes. Iterators with this behavior are called fail-fast iterators.
Implementing Iterable and returning an Iterator allows your class to be used as a collection with the enhanced for loop.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`hasNext()`	Returns true if there is at least one more element, false otherwise.
`E`	`next()`	Returns the next object and advances the iterator.
`void`	`remove()`	Removes the last object returned by `next` from the collection.

- Method Detail
  - hasNext
```
boolean hasNext()
```
    Returns true if there is at least one more element, false otherwise.
    
    Returns:
    
    true if there is a next element.
    
    See Also:
    
    next()
  - next
```
E next()
```
    Returns the next object and advances the iterator.
    
    Returns:
    
    the next object.
    
    Throws:
    
    java.util.NoSuchElementException - if there are no more elements.
    
    See Also:
    
    hasNext()
  - remove
```
void remove()
```
    Removes the last object returned by next from the collection. This method can only be called once between each call to next.
    
    Throws:
    
    java.lang.UnsupportedOperationException - if removing is not supported by the collection being iterated.
    
    java.lang.IllegalStateException - if next has not been called, or remove has already been called after the last call to next.