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public class ConcurrentModificationException
extends RuntimeException
This exception may be thrown by methods that have detected concurrent
modification of an object when such modification is not permissible.
For example, it is not generally permissible for one thread to modify a Collection
while another thread is iterating over it. In general, the results of the
iteration are undefined under these circumstances. Some Iterator
implementations (including those of all the general purpose collection implementations
provided by the JRE) may choose to throw this exception if this behavior is
detected. Iterators that do this are known as fail-fast iterators,
as they fail quickly and cleanly, rather that risking arbitrary,
non-deterministic behavior at an undetermined time in the future.
Note that this exception does not always indicate that an object has
been concurrently modified by a different thread. If a single
thread issues a sequence of method invocations that violates the
contract of an object, the object may throw this exception. For
example, if a thread modifies a collection directly while it is
iterating over the collection with a fail-fast iterator, the iterator
will throw this exception.
Note that fail-fast behavior cannot be guaranteed as it is, generally
speaking, impossible to make any hard guarantees in the presence of
unsynchronized concurrent modification. Fail-fast operations
throw ConcurrentModificationException on a best-effort basis.
Therefore, it would be wrong to write a program that depended on this
exception for its correctness: ConcurrentModificationException
should be used only to detect bugs.
Since:
See Also:Collection,
Iterator,
ListIterator,
Vector,
LinkedList,
HashSet,
Hashtable,
TreeMap,
AbstractList,
Serialized Form
ConcurrentModificationException()
Constructs a ConcurrentModificationException with no
detail message.
ConcurrentModificationException(Throwablecause)
Constructs a new exception with the specified cause and a detail
message of (cause==null ? null : cause.toString()) (which
typically contains the class and detail message of cause.
ConcurrentModificationException
publicConcurrentModificationException()
Constructs a ConcurrentModificationException with no
detail message.
ConcurrentModificationException
publicConcurrentModificationException(Stringmessage)
Constructs a ConcurrentModificationException with the
specified detail message.
Parameters:message - the detail message pertaining to this exception.
ConcurrentModificationException
publicConcurrentModificationException(Throwablecause)
Constructs a new exception with the specified cause and a detail
message of (cause==null ? null : cause.toString()) (which
typically contains the class and detail message of cause.
Parameters:cause - the cause (which is saved for later retrieval by the
Throwable.getCause() method). (A null value is
permitted, and indicates that the cause is nonexistent or
unknown.)Since:
ConcurrentModificationException
publicConcurrentModificationException(Stringmessage,
Throwablecause)
Constructs a new exception with the specified detail message and
cause.
Note that the detail message associated with cause is
not automatically incorporated in this exceptions detail
message.
Parameters:message - the detail message (which is saved for later retrieval
by the Throwable.getMessage() method).cause - the cause (which is saved for later retrieval by the
Throwable.getCause() method). (A null value
is permitted, and indicates that the cause is nonexistent or
unknown.)Since:
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