SimpleDateFormat 2005-09-21 - By Mike New
Back
> Frans,
> The DateFormat class is not threadsafe and making only one instance of
> dateFormat for the whole class will cause threading issues. Any instance
> of DateFormat or SimpleDateFormat should be method-local
>
> -Richard
Or synchronize it. From the javadoc:
"Date formats are not synchronized. It is recommended to create separate
format instances for each thread. If multiple threads access a format
concurrently, it must be synchronized externally."
So if you synchronize the call to the format() method, you should be fine.
On the other hand, creating a new one for each instance is not a large
overhead. Unless you'll be creating a LOT of them...
My $0.02.
Mike
> Frans Verhoef wrote:
>> Hi,
>> Make dateFormat a final static variable. This would create only one
>> instance of dateFormat for the whole class.
>>
>> Cheers,
>> Frans
>>
>> On Tue, 20 Sep 2005 17:36:26 -0600, SUBSCRIBE EJB-INTEREST anonymous
>> wrote:
>>
>>> Hi,
>>> Is there a better way to do the below in a multithreaded
>>> application?
>>>
>>> java.text.SimpleDateFormat dateFormat = new
>>> java.text.SimpleDateFormat ("MMddyyyy"); String formatedString =
>>> dateFormat.format(new Date());
>>>
>>> I have the below code within a method in a class.
>>>
>>> Since, an instance of java.text.SimpleDateFormat will be created
>>> for every call of the method, I was wondering this would create lot
>>> of objects in heap.
>>>
>>>
>>> Thanks in advance,
>>>
>>> ======================================================================
>>> ===== To unsubscribe, send email to listserv@(protected) and
>>> include in the body of the message "signoff J2EE-INTEREST". For
>>> general help, send email to listserv@(protected) and include in
>>> the body of the message "help".
>>>
>>
>> ===========================================================================
>> To unsubscribe, send email to listserv@(protected) and include in the
>> body
>> of the message "signoff J2EE-INTEREST". For general help, send email to
>> listserv@(protected) and include in the body of the message "help".
>>
>>
>>
>>
>
> ===========================================================================
> To unsubscribe, send email to listserv@(protected) and include in the
> body
> of the message "signoff J2EE-INTEREST". For general help, send email to
> listserv@(protected) and include in the body of the message "help".
>
-- ---- ---- ------ _/ /// // -- ---- ---- ---- --
===========================================================================
To unsubscribe, send email to listserv@(protected) and include in the body
of the message "signoff J2EE-INTEREST". For general help, send email to
listserv@(protected) and include in the body of the message "help".
|
|
