[jdjlist] RE: Using SimpleDateFormat

[Greg Nudelman]

I am going to go out on the limb and say that I would create a new formatter inside the method, unless you're expecting to be routinely processing a 10,000 date object Vector.  SimpleDateFormat should be fairly small. 

 

Alternatively, if you only got a couple of formats, you can easily write your own optimized thread-safe custom parser, and use Calendar class to create the Date object (or just use Calendar throughout).  I had to do this for the GMT date in the XML documents, as Sun was not forthcoming enough to write the W3C standard date format parser into their DateFormat. Imagine that!

 

We had no problems with this model for 6 months now in production.

 

Greg

 

 -----Original Message-----
From: Kamyar Varzandeh [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, January 29, 2003 10:59 PM
To: JDJList
Subject: [jdjlist] RE: Using SimpleDateFormat

Thank you all for your help. I have a follow-up question.  From  performance perspective, is it better to synchronize the methods (and use an instance variable formatter), or to create the formatter inside each method?

Thanks in advance.

 Rich Gibbs <[EMAIL PROTECTED]> wrote:

The SimpleDateFormat, and its underlying methods are not threadsafe.

 

 

-----Original Message-----
From: Kamyar Varzandeh [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, January 29, 2003 10:35 AM
To: JDJList
Subject: [jdjlist] Using SimpleDateFormat

Hi:

Are there any issues with using SimpleDateFormat as a static instance variable and then using it in all the methods as in

public class DateUtil {

public static final String MMDDYYYYFormat = "MM/dd/yyyy";

public static final SimpleDateFormat sdf_MMDDYYYY = new SimpleDateFormat(MMDDYYYYFormat);

public static Date toDate(String dateStr) throws ParseException {

return sdf_MMDDYYYY.parse(dateStr);

}

We have started getting NumberFormatException when invalid data is passed in.  We did not get such exceptions before when we had defined the formatter inside the method. Any ideas?

 

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