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Greenhorn
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Why local variables are thread safe while instance variables are not?
 
best scout
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Scala IntelliJ IDE Java
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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.

Marco
 
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