What pattern is followed when using FileFilter for filtering files ?

Question

Hi All,
FileFilter is used to filter files according to the condition specified.
for example the code is
FileFilter fileFilter = new FileFilter(){
public boolean accept(File inFile) {
// To return whether it is a file
return inFile.isFile();
// To return whether it ends with any extension.
// for example ends with .txt
// return inName.endsWith("txt");
File[] files = file.listFiles(fileFilter);
Here FileFilter is an interface.File is a class. What pattern is followed in this operation ? does it follows - similar to any design pattern in Java ? this implementation is similar to adding an ActionListener(like an Inner Class) to a button.
for example
Button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Thanks,
J.Kathir

Answer 1

I am using a FileFilter with the following extension "*.doc". The
getDescription() method for that extension returns "Microsoft Word
Document", which is what gets displayed in the "Files of Type"
dropdown. My problem is that if the user enter a wildcard (*) in the
"File Name" field and hit enter, it changes the "Files of Type" drop
down to that as well.
How do you prevent the "Files of Type" selection from changing when
using wildcard?