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

The simplest solution would be:

synchronized public static final String eventTypeToDateTimeString(long timestamp) {
  return DATE_FORMAT.format(new Date(timestamp));
}

No need to use ThreadLocals since this is all in a static context.