jeroen.util
Class AbstractIterator

java.lang.Object
  |
  +--jeroen.util.AbstractIterator

All Implemented Interfaces:

Iterator

Direct Known Subclasses:

ColorIterator, EmptyIterator

public abstract class AbstractIterator

extends Object

implements Iterator

Een abstracte implementatie van Iterator. Je moet next() en hasNext() nog zelf implementeren.

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.

See Also:

Iterator

Constructor Summary

AbstractIterator()

Method Summary

abstract boolean	hasNext() Returns true if the iteration has more elements.
abstract Object	next() Returns the next element in the interation.
void	remove() Removes from the underlying collection the last element returned by the iterator (optional operation).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractIterator

public AbstractIterator()

Method Detail

hasNext

public abstract 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.)

Specified by:

hasNext in interface Iterator

Returns:

true if the iterator has more elements.

next

public abstract Object next()

Returns the next element in the interation.

Specified by:

next in interface Iterator

Returns:

the next element in the iteration.

Throws:

NoSuchElementException - iteration has no more elements.

remove

public void remove()

Removes from the underlying collection the last element returned by the 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.

Specified by:

remove in interface Iterator

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.

UnsupportedOperationException - - als deze methode niet geoverrided is.