Exception question

[Dinesh Tahiliani]

public class ParentUltil
{


public static void main(String[] args) throws EOFException 
{

System.out.println("Start");
FileOutputStream of = null;
try
{
of = new FileOutputStream("test.txt");
of.write(122);

}
 
catch(IOException i)
{
System.out.println("IO error");


}
 

finally
{
of.close();
}
 

}
 
}

output :Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Unhandled exception type IOException

at testkg.ParentUltil.main(ParentUltil.java:34)

Can anyone please explain me this output.
I think we are catching the IOexception but then why its giving error

[Alexey Saenko]

Hi Dinesh,
please take a look at full signature of FileOutputStream.close(), here it is:

public void close() throws IOException

So, you should surround it with one more try/catch block

[Brian Legg]

Dinesh, I usually wrap all file i/o in its own try/catch like this:

Scanner input = new Scanner(System.in);
try {
File file = new File("File.ext");
if(file.exists()) {
/**
 * Our output data file already exists, so make sure the user wants to override it first.
 */
System.out.println("\n" + file.getName() + " already exists. Are you sure you want to override the file?");

try {
String data = input.nextLine();
if(!data.toUpperCase().startsWith("Y")) {
System.out.println("\nYou have chosen NOT to override the file...");
throw new Exception();
}
} catch(InputMismatchException e) {
System.out.println("Unexpected input received...");
throw e;
}
}
System.out.println("\nWriting data to file " + file.getName());

FileOutputStream fileOutputStream = new FileOutputStream(file);
ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);

try {
objectOutputStream.writeObject(new String("Stuff"));
} catch(Exception e) {
System.out.println("Error writing to hard drive! Aborting Program...");
throw e;
} finally {
objectOutputStream.close();
}

System.out.println("File " + file.getName() + " has been written.");
System.out.println("\nNow exiting program.");
} catch(Exception e) {
System.out.println("Aborting program...");
} finally {
input.close();
}

I just hacked it together, so I appologize for any errors.

EDIT: First time using code blocks, lol
[ November 19, 2008: Message edited by: Brian Legg ]