asked on

java exception during file operation

try
{
FileWriter fstream = new FileWriter(filename);
BufferedWriter out = new BufferedWriter(fstream);

so some processing on out.
out.close();
}

catch (Exception ex)
{
out.close();
}

===
I want to open a file and do some processing.
I want to close the file once everything is done.

If there is any exception
I am ccatching them but not able to close the file.
so when I keep the above code in catch, it gives cannot find symbol.

so when I keep the "out" decalartion outside try
unreported exception java.io.IOException; must be caught or declared to be thrown
FileWriter fstream = new FileWriter(filename);

can you correct me?

for_yan

Why you close it twice?

Mick Barry

BufferedWriter out = null;
try
{
FileWriter fstream = new FileWriter(filename);
out = new BufferedWriter(fstream);

so some processing on out.
out.close();
}

catch (Exception ex)
{
if (out!=null) out.close();
}

for_yan

"when I keep the above code in catch, it gives cannot find symbol" - strange - please post the bigger piece of code

Mick Barry

or use a finally block

BufferedWriter out = null;
try
{
FileWriter fstream = new FileWriter(filename);
out = new BufferedWriter(fstream);

so some processing on out.
}
catch (Exception ex)
{
ex.printStackTrace();
}
finally
{
if (out!=null) out.close();
}

sigma19

ASKER

Objects, the code you gave is not working as it gives
unreported exception java.io.IOException; must be caught or declared to be thrown

for_yan

Is this about this RSS ffeds program?
Works for me already for several days without any problems.

Keep them all in one try catch
loop, and don't catch IOException,
catch just Exception and you'll have no problems
with any of that.

sigma19

ASKER

nope this is for general file operations.

I have only one exception I dont catchIOExceptions.

the flow is same as what objects: mentioned.

ASKER CERTIFIED SOLUTION

Mick Barry

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for_yan

Well, if you want to be rigoristic, use finally.
All my life I open and close files and live without finally quite well