try...throw new ...catch

[patricktwo]

I am writtin a proggram for a class, I have to use exceptios. I have written this:

public void checkFirstNameInput()
{
try
{
if(sFirstName.length() == 0)
throw new FirstNameException("No Entry"
inputLastName.requestFocus();
}
catch (FirstNameException e)
{
JOptionPane.showMessageDialog(frame, "You must enter a valid name!", e.getMeesage, JOptionPane.ERROR_MESSAGE);
inputFirstName.requestFocus();
}

I get an error message "cannot resolve symbol" in both places that the exception is named.

 

[scrat]

Hi Patricktwo,

It looks like it can not find FirstNameException. Presumably you have written this somwhere else but is not visible to checkFirstNameInput(). Without seeing how it is written, I can not guess what is wrong.

The following compiles and might be some help:

String sFirstName;
Component inputLastName;
Component inputFirstName;
Frame frame;

public void checkFirstNameInput() {
try {
if (sFirstName.length() == 0)
throw new Exception("No Entry"
inputLastName.requestFocus();
} catch (Exception e) {
JOptionPane.showMessageDialog(frame, "You must enter a valid name!", e.getMessage(), JOptionPane.ERROR_MESSAGE);
inputFirstName.requestFocus();
}
}

scrat

 

[patricktwo]

I found that to have a named exception, you have to compile a separate class that names the named exception.
Your reply got me to thinking about that.
Thanks.