Changing L&F for the JFileChooser

Question

Hi,
take a look at Sun's bug #4711700. Using the Windows L&F, sometimes the JFileChooser throws a NullPointerException when the constructor is called.
Apparently, the bug is related to retrieving Windows system icons to be shown in the dialog, so it's probably not there when using a non Windows L&F.
As my app needs to use the L&F of the host OS, I was thinking about using a workaround like this:
JFileChooser jfc;
try {
  jfc = new JFileChooser(...);
} catch(NullPointerException ex) {
  /* change L&F for file chooser here */
  jfc = new JFileChooser();
}This may not be very appealing, but it's definitely better than the exception!
The question is: it possible to selectively change the L&F for the file chooser, without affecting the rest of the components, and how do I do it?

Answer 1

JFileChooser fileChooser=new JFileChooser();// to choose the file ExampleFileFilter filter = new ExampleFileFilter();// to make file settings
     filter.addExtension("jpeg");
     filter.addExtension("jpg");
     filter.setDescription("Image Format");
     fileChooser.setFileFilter(filter);//new File(".")
     fileChooser.setCurrentDirectory(new File("."));
     int result = fileChooser.showOpenDialog(printFrame);//to open dialog box
     if(result==JFileChooser.CANCEL_OPTION)
               file=null;
try this u can solve ur problem and , write example filter class
//ExampleFilter.java
import java.io.File;
import java.util.Hashtable;
import java.util.Enumeration;
import javax.swing.filechooser.*;
public class ExampleFileFilter extends FileFilter {
private static String TYPE_UNKNOWN = "Type Unknown";
private static String HIDDEN_FILE = "Hidden File";
private Hashtable filters = null;
private String description = null;
private String fullDescription = null;
private boolean useExtensionsInDescription = true;
public ExampleFileFilter() {
          this.filters = new Hashtable();
public ExampleFileFilter(String extension) {
     this(extension,null);
public ExampleFileFilter(String extension, String description) {
     this();
     if(extension!=null) addExtension(extension);
     if(description!=null) setDescription(description);
public ExampleFileFilter(String[] filters) {
     this(filters, null);
public ExampleFileFilter(String[] filters, String description) {
     this();
     for (int i = 0; i < filters.length; i++) {
     addExtension(filters);
     if(description!=null) setDescription(description);
public boolean accept(File f) {
     if(f != null) {
     if(f.isDirectory()) {
          return true;
     String extension = getExtension(f);
     if(extension != null && filters.get(getExtension(f)) != null) {
          return true;
     return false;
public String getExtension(File f) {
     if(f != null) {
     String filename = f.getName();
     int i = filename.lastIndexOf('.');
     if(i>0 && i<filename.length()-1) {
          return filename.substring(i+1).toLowerCase();
     return null;
public void addExtension(String extension) {
     if(filters == null) {
     filters = new Hashtable(5);
     filters.put(extension.toLowerCase(), this);
     fullDescription = null;
public String getDescription() {
     if(fullDescription == null) {
     if(description == null || isExtensionListInDescription()) {
          fullDescription = description==null ? "(" : description + " (";
          // build the description from the extension list
          Enumeration extensions = filters.keys();
          if(extensions != null) {
          fullDescription += "." + (String) extensions.nextElement();
          while (extensions.hasMoreElements()) {
               fullDescription += ", ." + (String) extensions.nextElement();
          fullDescription += ")";
     } else {
          fullDescription = description;
     return fullDescription;
public void setDescription(String description) {
     this.description = description;
     fullDescription = null;
public void setExtensionListInDescription(boolean b) {
     useExtensionsInDescription = b;
     fullDescription = null;
public boolean isExtensionListInDescription() {
     return useExtensionsInDescription;
try this u can solve ur problem and , write example filter class
cheers
nr konjeti