87 lines
3.6 KiB
Java
87 lines
3.6 KiB
Java
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/*
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* Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package java.util;
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/**
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* This exception may be thrown by methods that have detected concurrent
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* modification of an object when such modification is not permissible.
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* <p>
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* For example, it is not generally permissible for one thread to modify a Collection
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* while another thread is iterating over it. In general, the results of the
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* iteration are undefined under these circumstances. Some Iterator
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* implementations (including those of all the general purpose collection implementations
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* provided by the JRE) may choose to throw this exception if this behavior is
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* detected. Iterators that do this are known as <i>fail-fast</i> iterators,
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* as they fail quickly and cleanly, rather that risking arbitrary,
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* non-deterministic behavior at an undetermined time in the future.
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* <p>
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* Note that this exception does not always indicate that an object has
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* been concurrently modified by a <i>different</i> thread. If a single
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* thread issues a sequence of method invocations that violates the
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* contract of an object, the object may throw this exception. For
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* example, if a thread modifies a collection directly while it is
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* iterating over the collection with a fail-fast iterator, the iterator
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* will throw this exception.
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*
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* <p>Note that fail-fast behavior cannot be guaranteed as it is, generally
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* speaking, impossible to make any hard guarantees in the presence of
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* unsynchronized concurrent modification. Fail-fast operations
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* throw <tt>ConcurrentModificationException</tt> on a best-effort basis.
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* Therefore, it would be wrong to write a program that depended on this
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* exception for its correctness: <i><tt>ConcurrentModificationException</tt>
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* should be used only to detect bugs.</i>
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*
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* @author Josh Bloch
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* @see Collection
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* @see Iterator
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* @see ListIterator
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* @see Vector
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* @see LinkedList
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* @see HashSet
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* @see Hashtable
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* @see TreeMap
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* @see AbstractList
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* @since 1.2
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*/
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public class ConcurrentModificationException extends RuntimeException {
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/**
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* Constructs a ConcurrentModificationException with no
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* detail message.
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*/
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public ConcurrentModificationException() {
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}
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/**
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* Constructs a <tt>ConcurrentModificationException</tt> with the
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* specified detail message.
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*
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* @param message the detail message pertaining to this exception.
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*/
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public ConcurrentModificationException(String message) {
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super(message);
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}
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}
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