14.18.2

Execution of

try catch finally

BLOCKS AND STATEMENTS

N

If the run time type of

V

 is not assignable to the parameter of any

catch

clause of the

try

 statement, then the

try

 statement completes abruptly

because of a

throw

 of the value

V

.

If execution of the

try

 block completes abruptly for any other reason, then

the

try

 statement completes abruptly for the same reason.

In the example:

class BlewIt extends Exception {

BlewIt() { }

BlewIt(String s) { super(s); }

}

class Test {

static void blowUp() throws BlewIt { throw new BlewIt(); }

public static void main(String[] args) {

try {

blowUp();

} catch (RuntimeException r) {

System.out.println("RuntimeException:" + r);

} catch (BlewIt b) {

System.out.println("BlewIt");

}

}

}

the exception

BlewIt

 is thrown by the method

blowUp

. The

try

catch

 statement

in the body of

main

 has two

catch

 clauses. The run time type of the exception is

BlewIt

 which is not assignable to a variable of type

RuntimeException

, but is

assignable to a variable of type

BlewIt

, so the output of the example is:

BlewIt

14.18.2   Execution of

try catch finally

After the great captains and engineers have accomplish'd their work,

After the noble inventors after the scientists, the chemist,

the geologist, ethnologist,

Finally shall come the Poet . . .

 Walt Whitman,

Passage to India

 (1870)

292