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Re: Some same exceptions used in a given file

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Eric Sosman <esosman@ieee-dot-org.invalid> writes:

> On 4/23/2011 1:08 PM, Merciadri Luca wrote:
>> In some of my code files, I've got the following catch block
>>
>> ==
>>          catch (IOException cantOpenFile)
>>              {
>>                  System.err.println("Can't open " + inputFilename + ".");
>>                  System.exit(1);
>>              }
>> ==
>> more than once, but at different places in the file. Is it possible to
>> define this somewhere so that I can directly catch the exception with
>> the two given commands? (Just as one would define his own exception.)
>
>     Could you give an example of what you're trying to do?  (The
> above isn't sufficiently informative.)

Thanks for the answers. Sure I can provide more details. Let us
consider the following constructor:

==
   public FileStream ()
    {
        try
            {
                outputFile = new BufferedWriter(new FileWriter("hello.txt"));
            }
        catch (IOException cantWriteInFile)
            {
                System.out.println("Impossible to write (in) hello.txt.");
                System.exit(1);
            }
    }
==
You saw that I had to catch an IOException, as expected when dealing
with a BufferedWriter.

Now, in a function of the same class of the constructor (class
FileStream), I need to write in the output file. As a result, I've got

==
public void write (String outputText)
{
        try
            {
                outputFile.write(outputText);
                outputFile.close();
            }
        catch (IOException cantWriteInFile)
            {
                System.out.println("Impossible to write (in) hello.txt.");
                System.exit(1);
            }
}
==

You directly notice that the two catch blocks are identical. As a
result, I'd like to do something like this (in pseudocode):

==
  public FileStream ()
    {
        try
            {
                outputFile = new BufferedWriter(new FileWriter("hello.txt"));
            }
        catch (IOException cantWriteInFile);
    }
==
then, later in the file:

==
public void write (String outputText)
{
        try
            {
                outputFile.write(outputText);
                outputFile.close();
            }
        catch (IOException cantWriteInFile);
}
==
where IOException cantWriteInFile is defined in the class as

==
                System.out.println("Impossible to write (in) hello.txt.");
                System.exit(1);
==

Is there a way to do this? It looks terribly bad to have the same
catch code in two different methods.

- -- 
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- -- 

It is better to die on one's feet than live on one's knees.
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Some same exceptions used in a given file Merciadri Luca <Luca.Merciadri@student.ulg.ac.be> - 2011-04-23 19:08 +0200
  Re: Some same exceptions used in a given file Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-04-23 14:40 -0400
    Re: Some same exceptions used in a given file Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-04-23 16:23 -0400
    Re: Some same exceptions used in a given file Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-04-23 17:23 -0300
    Re: Some same exceptions used in a given file Merciadri Luca <Luca.Merciadri@student.ulg.ac.be> - 2011-04-24 00:00 +0200
      Re: Some same exceptions used in a given file Lew <noone@lewscanon.com> - 2011-04-23 18:22 -0400
      Re: Some same exceptions used in a given file Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-04-23 18:31 -0400
        Re: Some same exceptions used in a given file Merciadri Luca <Luca.Merciadri@student.ulg.ac.be> - 2011-04-24 01:20 +0200
          Re: Some same exceptions used in a given file Lew <noone@lewscanon.com> - 2011-04-23 20:19 -0400
      Re: Some same exceptions used in a given file Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-04-23 22:25 -0300
        Re: Some same exceptions used in a given file Merciadri Luca <Luca.Merciadri@student.ulg.ac.be> - 2011-04-24 09:24 +0200
  Re: Some same exceptions used in a given file Patricia Shanahan <pats@acm.org> - 2011-04-23 13:48 -0700
    Re: Some same exceptions used in a given file Merciadri Luca <Luca.Merciadri@student.ulg.ac.be> - 2011-04-24 09:34 +0200
      Re: Some same exceptions used in a given file Lew <noone@lewscanon.com> - 2011-04-24 09:40 -0400
      Re: Some same exceptions used in a given file Patricia Shanahan <pats@acm.org> - 2011-04-24 06:53 -0700
  Re: Some same exceptions used in a given file Merciadri Luca <Luca.Merciadri@student.ulg.ac.be> - 2011-04-24 01:28 +0200

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