Find Usages Diff Raw Download HTML Widget
Start line:  
End line:  

Snippet Preview

Snippet HTML Code

Stack Overflow Questions 
1
 /*
2
  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4
  *
5
  * This code is free software; you can redistribute it and/or modify it
6
  * under the terms of the GNU General Public License version 2 only, as
7
  * published by the Free Software Foundation.  Oracle designates this
8
  * particular file as subject to the "Classpath" exception as provided
9
  * by Oracle in the LICENSE file that accompanied this code.
10
 *
11
 * This code is distributed in the hope that it will be useful, but WITHOUT
12
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14
 * version 2 for more details (a copy is included in the LICENSE file that
15
 * accompanied this code).
16
 *
17
 * You should have received a copy of the GNU General Public License version
18
 * 2 along with this work; if not, write to the Free Software Foundation,
19
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20
 *
21
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22
 * or visit www.oracle.com if you need additional information or have any
23
 * questions.
24
 */
26
package java.util;

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.

Parameters:
<E> the type of elements returned by this iterator
Author(s):
Josh Bloch
Since:
1.2
See also:
Collection
ListIterator
java.lang.Iterable
52
public interface Iterator<E> {
    
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
60
    boolean hasNext();

    
Returns the next element in the iteration.

Returns:
the next element in the iteration
Throws:
NoSuchElementException if the iteration has no more elements
68
    E next();

    
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:
java.lang.UnsupportedOperationException if the remove operation is not supported by this iterator
java.lang.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
86
    void remove();
New to GrepCode? Check out our FAQ X