try catch blocks scope

Newbie & Debugging Questions
#1

Hello.
If you put something inside try block, does it apply on everything inside try block? Like if you open new blocks or loops inside, does the try / catch apply to them also? Kind of silly question, but I’m debuging and I’m little bit confused about output to console. Thank you.

#2

Scope is between { and }


{
   int a = 6;

   { // A is still accessible in here
       int b = 5;
   }  // B is not accessible anymore
} // A is not accessible anymore

so the try/catch code doesn’t really matter, only the { and }

#3

When you have a try-catch block inside another, any exception thrown within the nested try will be caught by the nested try’s catch and not the outer try’s catch unless you re-throw it.

For example, the following will print “caught in nested try” only:

try{
try{
throw new Exception()
}
catch(Exception e){
System.out.println(“caught in nested try”);
}
}
catch(Exception e){
System.out.println(“caught in outer try”);
}

#4

thank you guys… Allthough it wasn’t a direct anwser it can be figured out from it.

I was actually asking will something like this be cought:

try {
throw new Exception() // - this will be cougth
while (something) {
throw new Exception() // - wasnt sure about this since it’s in a new block
}
}

It’s clear now that both will be cought. Thanks.

#5

Direct answers are bad

#6

You will never reach the while as the first throw will jump you out to the catch block.

In fact, this shouldnt even compile as you have provably unreachable code…

#7

You know, I have a feeling it was a contrived example to illustrate a point :wink:

Kev

#8

Maybe, but even so he asked “what does this do.”

Thats the answer.