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Possible Duplicate:
When and how should I use a ThreadLocal variable?
What I know about thread local is .
1) Thread Local must be declared as public static final .
2) Thread Local is a Local Variable for current thread .
it doesn’t need to be public
but it is essentially a Map where you can only get for the current Thread as key and when the value hasn’t been set yet it is initialized automatically
this implements thread local storage so you can have “public static” variables without needing to synchronize on them