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Tip: Do Not Assume SimpleDateFormat Is Thread-safe

Learn why it is important to remember that sharing a SimpleDateFormat requires proper synchronization.


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The code below is improper because it shares a static instance of a SimpledateFormat with any possible number of threads.

Public class Constants {
     Public static final SimpleDateFprmat date = new SimpleDateFormat("dd.MM.yyyy");
}

SimpleDateFormat is not thread-safe; if multiple threads concurrently use this object, the result is undefined and the output will be bizarre (from format and parse or even exceptions). This code also doesn't take the time zone into account and it is important to remember that sharing a SimpleDateFormat requires proper synchronization.

 

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Octavia Andreea Anghel is a senior PHP developer currently working as a primary trainer for programming teams that participate at national and international software-development contests. She consults on developing educational projects at a national level. She is a coauthor of the book "XML Technologies--XML in Java" (Albastra, ISBN 978-973-650-210-1), for which she wrote the XML portions. In addition to PHP and XML, she's interested in software architecture, web services, UML, and high-performance unit tests.
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