java.util
Class ConcurrentModificationException

java.lang.Object sample code for java.lang.Object definition code for java.lang.Object 
  extended by java.lang.Throwable sample code for java.lang.Throwable definition code for java.lang.Throwable 
      extended by java.lang.Exception sample code for java.lang.Exception definition code for java.lang.Exception 
          extended by java.lang.RuntimeException sample code for java.lang.RuntimeException definition code for java.lang.RuntimeException 
              extended by java.util.ConcurrentModificationException
All Implemented Interfaces:
Serializable sample code for java.io.Serializable definition code for java.io.Serializable

public class ConcurrentModificationException
extends RuntimeException sample code for java.lang.RuntimeException definition code for java.lang.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:
1.2
See Also:
Collection sample code for java.util.Collection definition code for java.util.Collection , Iterator sample code for java.util.Iterator definition code for java.util.Iterator , ListIterator sample code for java.util.ListIterator definition code for java.util.ListIterator , Vector sample code for java.util.Vector definition code for java.util.Vector , LinkedList sample code for java.util.LinkedList definition code for java.util.LinkedList , HashSet sample code for java.util.HashSet definition code for java.util.HashSet , Hashtable sample code for java.util.Hashtable definition code for java.util.Hashtable , TreeMap sample code for java.util.TreeMap definition code for java.util.TreeMap , AbstractList sample code for java.util.AbstractList definition code for java.util.AbstractList , Serialized Form

Constructor Summary
ConcurrentModificationException sample code for java.util.ConcurrentModificationException.ConcurrentModificationException() definition code for java.util.ConcurrentModificationException.ConcurrentModificationException() ()
          Constructs a ConcurrentModificationException with no detail message.
ConcurrentModificationException sample code for java.util.ConcurrentModificationException.ConcurrentModificationException(java.lang.String) definition code for java.util.ConcurrentModificationException.ConcurrentModificationException(java.lang.String) (String sample code for java.lang.String definition code for java.lang.String  message)
          Constructs a ConcurrentModificationException with the specified detail message.
 
Method Summary
 
Methods inherited from class java.lang.Throwable sample code for java.lang.Throwable definition code for java.lang.Throwable
fillInStackTrace sample code for java.lang.Throwable.fillInStackTrace() definition code for java.lang.Throwable.fillInStackTrace() , getCause sample code for java.lang.Throwable.getCause() definition code for java.lang.Throwable.getCause() , getLocalizedMessage sample code for java.lang.Throwable.getLocalizedMessage() definition code for java.lang.Throwable.getLocalizedMessage() , getMessage sample code for java.lang.Throwable.getMessage() definition code for java.lang.Throwable.getMessage() , getStackTrace sample code for java.lang.Throwable.getStackTrace() definition code for java.lang.Throwable.getStackTrace() , initCause sample code for java.lang.Throwable.initCause(java.lang.Throwable) definition code for java.lang.Throwable.initCause(java.lang.Throwable) , printStackTrace sample code for java.lang.Throwable.printStackTrace() definition code for java.lang.Throwable.printStackTrace() , printStackTrace sample code for java.lang.Throwable.printStackTrace(java.io.PrintStream) definition code for java.lang.Throwable.printStackTrace(java.io.PrintStream) , printStackTrace sample code for java.lang.Throwable.printStackTrace(java.io.PrintWriter) definition code for java.lang.Throwable.printStackTrace(java.io.PrintWriter) , setStackTrace sample code for java.lang.Throwable.setStackTrace(java.lang.StackTraceElement[]) definition code for java.lang.Throwable.setStackTrace(java.lang.StackTraceElement[]) , toString sample code for java.lang.Throwable.toString() definition code for java.lang.Throwable.toString()
 
Methods inherited from class java.lang.Object sample code for java.lang.Object definition code for java.lang.Object
clone sample code for java.lang.Object.clone() definition code for java.lang.Object.clone() , equals sample code for java.lang.Object.equals(java.lang.Object) definition code for java.lang.Object.equals(java.lang.Object) , finalize sample code for java.lang.Object.finalize() definition code for java.lang.Object.finalize() , getClass sample code for java.lang.Object.getClass() definition code for java.lang.Object.getClass() , hashCode sample code for java.lang.Object.hashCode() definition code for java.lang.Object.hashCode() , notify sample code for java.lang.Object.notify() definition code for java.lang.Object.notify() , notifyAll sample code for java.lang.Object.notifyAll() definition code for java.lang.Object.notifyAll() , wait sample code for java.lang.Object.wait() definition code for java.lang.Object.wait() , wait sample code for java.lang.Object.wait(long) definition code for java.lang.Object.wait(long) , wait sample code for java.lang.Object.wait(long, int) definition code for java.lang.Object.wait(long, int)
 

Constructor Detail

ConcurrentModificationException sample code for java.util.ConcurrentModificationException() definition code for java.util.ConcurrentModificationException()

public ConcurrentModificationException()
Constructs a ConcurrentModificationException with no detail message.


ConcurrentModificationException sample code for java.util.ConcurrentModificationException(java.lang.String) definition code for java.util.ConcurrentModificationException(java.lang.String)

public ConcurrentModificationException(String sample code for java.lang.String definition code for java.lang.String  message)
Constructs a ConcurrentModificationException with the specified detail message.

Parameters:
message - the detail message pertaining to this exception.