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125 lines
4.1 KiB
125 lines
4.1 KiB
/*
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* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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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 {@code ConcurrentModificationException} 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>{@code ConcurrentModificationException}
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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 Spliterator
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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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private static final long serialVersionUID = -3666751008965953603L;
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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 {@code ConcurrentModificationException} 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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* Constructs a new exception with the specified cause and a detail
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* message of {@code (cause==null ? null : cause.toString())} (which
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* typically contains the class and detail message of {@code cause}.
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*
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* @param cause the cause (which is saved for later retrieval by the
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* {@link Throwable#getCause()} method). (A {@code null} value is
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* permitted, and indicates that the cause is nonexistent or
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* unknown.)
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* @since 1.7
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*/
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public ConcurrentModificationException(Throwable cause) {
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super(cause);
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}
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/**
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* Constructs a new exception with the specified detail message and
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* cause.
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*
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* <p>Note that the detail message associated with <code>cause</code> is
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* <i>not</i> automatically incorporated in this exception's detail
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* message.
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*
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* @param message the detail message (which is saved for later retrieval
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* by the {@link Throwable#getMessage()} method).
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* @param cause the cause (which is saved for later retrieval by the
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* {@link Throwable#getCause()} method). (A {@code null} value
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* is permitted, and indicates that the cause is nonexistent or
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* unknown.)
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* @since 1.7
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*/
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public ConcurrentModificationException(String message, Throwable cause) {
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super(message, cause);
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}
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}
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