JFile Chooser - Add automatic file extension while Saving

Question

Hello,
I have a JFileChooser, which I use for saving output from my program.
Problem is whenever I save a new file I have to manually specify its extension, otherwise I get an undefined file with no extensions.
I want my default extension to be ".txt".
Any ideas on what method to use? Is this a trivial issue or a complicated one?
Thank you,
Berkan

Answer 1

What about this? Not tested.
import java.awt.Component;
import java.io.File;
import javax.swing.JFileChooser;
public class FilenameGetter {
    private JFileChooser chooser = new JFileChooser();
    public File getFileToSaveTxt(Component parent) {
     if (JFileChooser.APPROVE_OPTION == chooser.showSaveDialog(parent)) {
         File chosenFile = chooser.getSelectedFile();
         if (chosenFile.getName().endsWith(".txt")) {
          return chosenFile;
         } else {
          return new File(chosenFile.getParentFile(), chosenFile
               .getName()
               + ".txt");
     } else {
         return null;
}Piet