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A '''final [[variable]]''' is [[immutable]]. It can only be assigned to one value. If the variable is a field of a class, it must be assigned to in the constructor of its class. (Note: If the variable is a reference, this means that the variable cannot be re-bound to reference another object. But the object that it references is still mutable if it was originally mutable.)
Unlike the value of a [[constant (computer science)|constant]], the value of a final variable is not necessarily known at compile time.
Example:
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