Why variables that we don't modify should be final?

Hello,

I just passed PMD in my Java code.. and a lot of variables the PMD says that
should be final.. just because I do not modify.
I know that, like this, it's safer because I'm sure that it wil be not
modified ever...
But, besides that, is there another advantage? like performance or anything
else?

Thanks in advance.
Ivo


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