Im trying to return a JOptionePane message dialog for each one of the possible throws on my method:
public void add_note(String note) throws FileNotFoundException, IOException, InvalidFormatException{
... content ...
}
Is there any way to do this?
You could try something like :
public void add_note(String note) throws FileNotFoundException, IOException, InvalidFormatException
{
try
{
...content...
}
catch(FileNotFoundException fnfEx)
{
throw new FileNotFoundException("File was not found");
}
catch(IOException ioEx)
{
throw new FileNotFoundException("I/O exception");
}
catch(InvalidFormatException invEx)
{
throw new FileNotFoundException("Invalid format errror");
}
}
Where you put the message you want in the new exceptions and you print the exception message in the JOptionPane.
Using a Try-Catch you can catch any exception and return something when an exception occurs. You should do this for all of your cases.
public void add_note(String note){
try {
//code
} catch (FileNotFoundException e) {
//return something
}
}
wrap your code inside try catch. Inside catch block for each exception type throw the message specific to each exception
Instead of throwing exceptions, handle each individually in your method:
public JOptionPane add_note(String note) {
try {
...
} catch (FileNotFoundException fnfe) {
return ...;
} catch (IOException ioe) {
return ...;
} catch (InvalidFormatException ife) {
return ...;
}
}
I'll suggest you an alternative approach, as no one mentioned it. I'd use AOP to catch those exceptions and show to the end user. You'll write a simple aspect, and dont mess your code with try and catch blocks.
Here is an example of such aspect
@Aspect
public class ErrorInterceptor{
@AfterThrowing(pointcut = "execution(* com.mycompany.package..* (..))", throwing = "exception")
public void errorInterceptor(Exception exception) {
if (logger.isDebugEnabled()) {
logger.debug("Error Message Interceptor started");
}
// DO SOMETHING HERE WITH EXCEPTION
logger.debug( exception.getCause().getMessage());
if (logger.isDebugEnabled()) {
logger.debug("Error Message Interceptor finished.");
}
}
}
If you don't know what Aspect Oriented Programming is definitely go check it out, this is very powerfull concept (just like OOP), spend some time to learn it.
If you want to show a dialog with the JOptionPane.showMessageDialog do as follows:
public void add_note(String note){
try {
//code
} catch (FileNotFoundException | IOException | InvalidFormatException e) {
JOptionPane.showMessageDialog(frame, e.getMessage(), "Title", JOptionPane.ERROR_MESSAGE);
//manage the exception here
}
}
