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Java / Java ThreadLocal

When should I use a ThreadLocal variable?

One of the common use is when we have a object that is not thread-safe and not want to synchronize on the object, we may use ThreadLocal to have each thread its own instance of the object.

The well known example for ThreadLocal is SimpleDateFormat which is not thread-safe and we may use ThreadLocal to have every thread its own instance of SimpleDateFormat class.

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