exception handling

[J Recker]

I just ran the following code:

  public class Test {
 
public void fragile() {
throw new IllegalArgumentException();
}
 
void myMethod() {
try {
   fragile();
} 
catch (NullPointerException npex) {
   System.out.println("Nullponter thrown");
}
catch (Exception e) {
   System.out.println("Exception thrown");
}
finally {
   System.out.println("finally");
}
System.out.println("after exceptions");
 
}
 
public static void main(String[] args) {
Test t = new Test();
t.myMethod();
}
}
  

and the output is: Exception thrown
finally
after exceptions




I thought that after an exception is thrown, the catch will run, then finally, then it will exit the rest of the code. why does 'after exceptions' print out?

Thanks

[E McKenney]

Because once you catch the exception, execution flow resumes after the try-catch-finally block. That's also why you didn't have to declare your method with 'throws', because you handle the exception inside the method.

You'd only skip that last line if you didn't handle the exception that was thrown, or if you handled it but threw another one inside your catch block.

[Naseem Khan]

Originally posted by J Recker:
...
I thought that after an exception is thrown, the catch will run, then finally, then it will exit the rest of the code. why does 'after exceptions' print out?

Thanks

Remember when exception is caught, normal execution will continue. On the other hand, if suppose exception in uncaught, then it will be propagated to the method stack. In that case, after the execution of finally block, control will be returned to the caller and any line outside the try/catch/finally block will not be executed.


Naseem
[ September 06, 2006: Message edited by: Naseem Khan ]

[vRaj Verma]

The try/catch/finally block is used to establish boundaries. Any code outside this boundary will always execute.

[Burkhard Hassel]

Hi cowboys,

J Recker wrote:

I thought that after an exception is thrown, the catch will run, then finally, then it will exit the rest of the code. why does 'after exceptions' print out?

It will execute the rest of the code. - After the try block.

BTW
You don't have to declare that myMethod throws an Illegal Arg. Exc. because it is a Runtime Exception.


Yours,
Bu.