How to keep filename in textfield when filter is changed in a filechooser

Question

Hi, guys,
I met a problem to keep filename in textfield when filter is changed in a filechooser
for example, a JFileChooser has two filters
*.jpg
*.png
Before I open JFileChooser, I used setSelectedFile(File) to set "aaa.jpg" as default name in textfield.
when I change the filter to "*.png, ", I want to change the text in textfield to "aaa.png", Actually, I used setSelectedFile(File), If there is an existed file named "aaa.png", this file will be selected on fileView, but the name will not be shown on the textfield. Anybody has ideas?
Thanks in advanced.

Answer 1

I really thank you for your answer, but it seems you misunderstand what I said because of my poor english..
what I said is:
after you open the filechooser, the filechooser has a combobox to choose file filter and a field to show filename.
what I want is:
when you open the filechooser, initial name in field is "test. jpg"
change filter, "test.jpg" will be change to "test.gif" in the field.
I don't want to close the filechooser.
That's why I used a listener to listen JFileChooser.FILE_FILTER_CHANGED_PROPERTY event.
and I modified your codes
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.filechooser.FileFilter;
class Testing extends JFrame {
     String defaultFile = "";
     JFileChooser fc = new JFileChooser(".");
     ExtensionFileFilter eff;
     public Testing() {
          setLocation(200, 300);
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          JButton btnShow = new JButton("Show Chooser");
          JPanel p = new JPanel(new GridLayout(1, 2));
          p.add(btnShow);
          getContentPane().add(p, BorderLayout.SOUTH);
          pack();
          fc.addPropertyChangeListener(new Listener(fc));
          fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
          fc.setAcceptAllFileFilterUsed(false);
          fc.setFileFilter(new ExtensionFileFilter(".gif"));
          fc.addChoosableFileFilter(new ExtensionFileFilter(".jpg"));
          defaultFile = defaultFile.equals("") ? "Test.jpg" : "Test.gif";
          fc.setSelectedFile(new java.io.File(defaultFile));
          btnShow.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent ae) {
                    fc.showOpenDialog(Testing.this);
     public static void main(String[] args) {
          new Testing().setVisible(true);
class ExtensionFileFilter extends FileFilter {
     String fileTypes = "";
     java.util.List extensions = new java.util.ArrayList();
     public ExtensionFileFilter() {
     public ExtensionFileFilter(String ft) {
          fileTypes = ft;
     public String getDescription() {
          return fileTypes;
     public boolean accept(File f) {
          if(f.isDirectory()) return true;
          if (f.getName().endsWith(fileTypes)) {
               return true;
          return false;
class Listener implements PropertyChangeListener {
    JFileChooser fChooser = null;
    Listener(JFileChooser fChooser) {
        this.fChooser = fChooser;
    public void propertyChange(PropertyChangeEvent evt) {
        if (evt.getPropertyName().equals(JFileChooser.FILE_FILTER_CHANGED_PROPERTY)) {
             FileFilter fileFilter = (FileFilter) evt.getNewValue();
            if (fileFilter != null) {
                String fileName = null;
                if (fileFilter.getDescription().equals(".jpg")) {
                    fileName = "Test.jpg";
                } else if (fileFilter.getDescription().equals(".gif")){
                     fileName = "Test.gif";
                String newFileName = "C:\\" + fileName;
                fChooser.setSelectedFile(new File(newFileName));
}Thanks again.
Message was edited by:
JadeSword