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The Java® Language Specification, Java SE 7 Edition, Fourth Edition by Alex Buckley, Gilad Bracha, Guy Steele, Bill Joy, James Gosling

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16.3. Definite Assignment and Parameters

• A formal parameter V of a method or constructor (§8.4.1, §8.8.1) is definitely assigned (and moreover is not definitely unassigned) before the body of the method or constructor.

• An exception parameter V of a catch clause (§14.20) is definitely assigned (and moreover is not definitely unassigned) before the body of the catch clause.

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