mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-28 03:04:44 +08:00
88 lines
3.4 KiB
Java
88 lines
3.4 KiB
Java
/* Iterator.java -- Interface for iterating over collections
|
|
Copyright (C) 1998, 2001 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
|
|
package java.util;
|
|
|
|
/**
|
|
* An object which iterates over a collection. An Iterator is used to return
|
|
* the items once only, in sequence, by successive calls to the next method.
|
|
* It is also possible to remove elements from the underlying collection by
|
|
* using the optional remove method. Iterator is intended as a replacement
|
|
* for the Enumeration interface of previous versions of Java, which did not
|
|
* have the remove method and had less conveniently named methods.
|
|
*
|
|
* @author Original author unknown
|
|
* @author Eric Blake <ebb9@email.byu.edu>
|
|
* @see Collection
|
|
* @see ListIterator
|
|
* @see Enumeration
|
|
* @since 1.2
|
|
* @status updated to 1.4
|
|
*/
|
|
public interface Iterator
|
|
{
|
|
/**
|
|
* Tests whether there are elements remaining in the collection. In other
|
|
* words, calling <code>next()</code> will not throw an exception.
|
|
*
|
|
* @return true if there is at least one more element in the collection
|
|
*/
|
|
boolean hasNext();
|
|
|
|
/**
|
|
* Obtain the next element in the collection.
|
|
*
|
|
* @return the next element in the collection
|
|
* @throws NoSuchElementException if there are no more elements
|
|
*/
|
|
Object next();
|
|
|
|
/**
|
|
* Remove from the underlying collection the last element returned by next
|
|
* (optional operation). This method can be called only once after each
|
|
* call to <code>next()</code>. It does not affect what will be returned
|
|
* by subsequent calls to next.
|
|
*
|
|
* @throws IllegalStateException if next has not yet been called or remove
|
|
* has already been called since the last call to next.
|
|
* @throws UnsupportedOperationException if this Iterator does not support
|
|
* the remove operation.
|
|
*/
|
|
void remove();
|
|
}
|