Making DateFormat Threadsafe. What to use, synchronized or Thread local

Question

I want to make following code thread safe. What is the best way to achieve it?

private static final DateFormat DATE_FORMAT = DateFormat.getDateTimeInstance(         


        

Answer 1

Just create a new copy on each call until it's actually demonstrated to be a performance problem. The overhead of manually managing thread-locals is likely to swamp any advantage you get from caching them.