throw and throws

[Ravissant Markenday]

hi everyone!

Could anyone please tell me the diffrence between the "throw" and "throws" clauses in exception handling?

thanks in advance,
Ravissant Markenday

[Prabhu Venkatachalam]

throw - used when you want to throw exception explicitly. you can throw any exception which subclass of Throwable interface.

Example:

[B]throw new Exception("Exception occurred");[/B]

throws - used when you think that your method may throw exception, so caller should take care of it.

Example:
This method is from FileInputStream class. It says, if you use read() method then you need to catch IOException.

[B]public int read() throws IOException[/B]

[Ravissant Markenday]

Thanks for the reply Prabhu, so can both "throw" and "throws" be used for checked and unchecked exceptions???

Thanks again,

Warm Regards,
Ravissant Markenday

[Ravissant Markenday]

yes and one more question here, does jvm handle both checked and unchecked exceptions??

Thanks,

Regards,
Ravissant Markenday

[Prabhu Venkatachalam]

can both "throw" and "throws" be used for checked and unchecked exceptions???

Yes, you can.However, if throw unchecked exceptions using throw or throws, it is not mandatory for caller to handle it. means caller can call your method without try{}catch(){}.

[Prabhu Venkatachalam]

does jvm handle both checked and unchecked exceptions??

How JVM knows, how to handle the exception which occurred in your code?

JVM is the one who throws those exception, saying "Buddy, something wrong with your code, check it!".

hth,

[Ravissant Markenday]

Thanks Prabhu !!!

[Aditya Jha]

One small correction on the first reply to this question - Throwable is not an interface, but a perfectly instantiable class.