throw an exception in catch

Muyavil · September 22nd, 2007, 06:04 PM

Hello.
I don't really understand what happens when you throw an exception inside a catch block. What I have understood is that the exception is sent to the method in which the exception that was caught occurs Like:

Code:

try {
  aMethod();      //In this method exception1 occurs
} catch(Exception1 e) {
  throw new Exception2();
}

Does Exception2 get sent to aMethod? If so what happens next? What if the same exception Exception1 is thrown in that catch block and is sent to aMethod again? Will it be caught again by the same catch block and end up repeating an infinite number of iterations?

I got a bit confused with this part of chapter 7. Any help will be apreciated.

Remember, remember the 5th of November. The gunpowder, treason, and plot. I know of no reason why the gunpowder treason should ever be forgot.

iamrakesh22 · September 23rd, 2007, 11:37 PM

say you've a code block like the one bellow

Code:

method1() throws Exception2{
   try {
     aMethod();      //In this method exception1 occurs
   } catch(Exception1 e) {
     // do some operations when exception occures
     throw new Exception2();
   }
}
method2() {
   try {
      method1();
   } catch(Exception2 e) {
      // handle the exception
   }
}

method1() throws an exception of type Exception2 you can see the method has a "throws" clause. If some other method calls this one that method [in this case method1()] should handle the exception.

So the throws new Exception2() wont call the same method it'll throw an exception and the control will be take out of the method where the exception occurred. If you the calling method [method2() in this example] did not handles it then the exception will be thrown all the way to JRE.

Hope its clear to you.

- Rakesh

Muyavil · September 24th, 2007, 06:42 AM

All clear.

Thank you Sir.

Remember, remember the 5th of November. The gunpowder, treason, and plot. I know of no reason why the gunpowder treason should ever be forgot.

PeterPeiGuo · April 11th, 2009, 10:56 PM

The exception that you throw will be caught by the caller.