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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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14.18. The throw Statement

A throw statement causes an exception (§11) to be thrown. The result is an immediate transfer of control (§11.3) that may exit multiple statements and multiple constructor, instance initializer, static initializer and field initializer evaluations, and method invocations until a try statement (§14.20) is found that catches the thrown value. If no such try statement is found, then execution of the thread (§17) that executed the throw is terminated (§11.3) after invocation of the uncaughtException method for the thread group to which the thread belongs.

ThrowStatement:    throw Expression ;

The Expression in a throw statement must denote either 1) a variable or value of a reference type which is assignable (§5.2) to the ...

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