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Doubt in code with exception

Kosh Shah
Greenhorn

Joined: Jul 20, 2004
Posts: 19


At Point X on line 4, which code is necessary to make the code compile?
A. No code is necessary.
B. throws Exception
C. catch ( Exception e )
D. throws RuntimeException
E. catch ( TestException e)

Answer: B

Could you'll explain me this? Or is there an error in Line 1?

Cheers,
Kosh!
Inuka Vincit
Ranch Hand

Joined: Aug 10, 2004
Posts: 175


runTest throws an Exception which is not a subtype of RunTimeException(those which extend are unchecked exception). Therefore TestException is known as a checked exception.

Since test() runs the runTest method, a TextException a checked exception is thrown inside the method. The jave rule is that checked exceptions should be caught or declared. Caught means the exception occur in a try catch block and is caught by catch. Declared means that the method must declare the exception in the throws clause of the method. In this case the exception is not caught therefore runTest must declare a throws TestException(or a type that is a super type).

unchecked exceptions do not have this restriction

exceptions in the java spec


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Barry Gaunt
Ranch Hand

Joined: Aug 03, 2002
Posts: 7729
It looks to me that line 1 and line 2 are out of sequence. And the "Exception Test" should be "ExceptionTest" (without the blank).

Otherwise, TestException is an inner class of ExceptionTest (and not static either).

Where did this question come from?
[ October 03, 2004: Message edited by: Barry Gaunt ]

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Ilja Preuss
author
Sheriff

Joined: Jul 11, 2001
Posts: 14112
Originally posted by Barry Gaunt:
Otherwise, TestException is an inner class of ExceptionTest (and not static either).


Which isn't a problem, is it?


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