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What is the use of using final keyword for local primitive variables in java. Is there any performance benefit ?

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  • I don't think there is a performance benefit. Except you use a local variable or parameter inside an anonymous class defined inside a method (in this case you must define it final), it's no too useful. Commented May 1, 2017 at 9:01

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The final keyword has more than one meaning:

  • a final class cannot be extended
  • a final method cannot be overridden
  • final fields, parameters, and local variables cannot change their value once set

Using final:

  • clearly communicates your intent.
  • allows the compiler and virtual machine to perform minor optimizations
  • clearly flags items which are simpler in behaviour - final says, "If you are looking for complexity, you won't find it here."
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