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Ramm Kummar

Joined: Feb 10, 2009
Posts: 26
Why local variables are thread safe while instance variables are not?
Marco Ehrentreich
best scout

Joined: Mar 07, 2007
Posts: 1294

Hi Ramm,

in short instance variables are shared among all threads accessing the same object. In contrast local variables are stored within a stack frame which is created for each method call. For this every thread calling a method gets its own copy of a local variable and can't interfere with other threads this way. Of course multi-threading is a lot more complicated but this is the basic difference between instance variables and local variables.

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