java Object inside a try {}

Question

Hy ... I have the following code :

    try { Nrtrde record = new Nrtrde(); }
    catch (Exception e) {
        System.out.println(" ERROR\n");
        e.printStackTrace(); }
    finally { Nrtrde record = new Nrtrde(); System.out.println(" OK\n"); }

record.setSpecificationVersionNumber(specificationVersionNo);

and when compiling i get the following error :

NRTRDE\ENCODER.java:28: error: cannot find symbol
        record.setSpecificationVersionNumber(specificationVersionNo);
        ^
  symbol:   variable record
  location: class ENCODER
1 error

It seems I cannot create an object insinde a try {} and use it outside try {} ..

Why ?

Thank you

Sean Patrick Floyd · Accepted Answer · 2012-03-30T09:05:55.337

5

You have to declare it outside the block, but you can initialize it inside the block:

Nrtrde record = null;
try { 
    record = new Nrtrde();
} catch (SomeException e) {
    // handle exception here
}
if(record!=null){
    // do something with it
}

In Java, {} are block delimiters. Nothing is visible outside the block it is defined in. (Class members are an exception to this rule if the visibility allows it).

edited Mar 30 '12 at 09:05

answered Mar 30 '12 at 08:57

Sean Patrick Floyd

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score 3 · Answer 2 · answered Mar 30 '12 at 08:57

3

Because its scope is limited to {}. It wont be recognized outside. Thats why you are getting this error

answered Mar 30 '12 at 08:57

Habib

219,104
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score 2 · Answer 3 · answered Mar 30 '12 at 08:58

You are correct in that case your object will exist until you program will exit the try block. That is because it is scoped by the {}

To make it visible both in the try and finally/catch do something like:

Nrtrde record;
 try { record = new Nrtrde(); }
    catch (Exception e) {
        System.out.println(" ERROR\n");
        e.printStackTrace(); }
    finally { record = new Nrtrde(); System.out.println(" OK\n"); }

score 0 · Answer 4 · answered Mar 30 '12 at 08:58

0

Your record variable is visible only within the try and finally block, you have to declare your Nrtrde before the try-catch-finally block.

answered Mar 30 '12 at 08:58

Kojotak

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score 0 · Answer 5 · edited Aug 14 '18 at 18:49

0

A variable can be acccessed only between a pair of curly braces { }.

http://www.java2s.com/Tutorial/Java/0020__Language/VariableScope.htm

edited Aug 14 '18 at 18:49

MattAllegro

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answered Mar 30 '12 at 09:08

Achintya

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java Object inside a try {}

5 Answers5