Web Reference: May 4, 2009 · Local vars are always thread safe. I assume that it is bad practice to make DateFormats local because they are expensive to create, but I have never seen solid metrics on this topic. This is high price to pay for hacking SimpleDateFormat. Perhaps it's better to use a thread-safe alternative. In this tutorial, we’ll be looking at the ThreadLocal construct from the java.lang package. This gives us the ability to store data individually for the current thread and simply wrap it within a special type of object. Returns the value in the current thread's copy of this thread-local variable. If the variable has no value for the current thread, it is first initialized to the value returned by an invocation of the initialValue() method.
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